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CN112538624B - Inner tube temperature estimation method in preparation of ductile iron pipe functional layer by SHS centrifugal method and application thereof - Google Patents

Inner tube temperature estimation method in preparation of ductile iron pipe functional layer by SHS centrifugal method and application thereof Download PDF

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CN112538624B
CN112538624B CN202011250381.0A CN202011250381A CN112538624B CN 112538624 B CN112538624 B CN 112538624B CN 202011250381 A CN202011250381 A CN 202011250381A CN 112538624 B CN112538624 B CN 112538624B
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temperature
ductile iron
iron pipe
functional layer
shs
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CN112538624A (en
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陈德茂
蔡可辉
赵云飞
滕文峰
李超刚
张修海
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Guoming Ductile Iron Pipes Co Ltd
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Guoming Ductile Iron Pipes Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
    • C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G01K3/06—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of space

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

An estimation method of inner tube temperature when preparing a ductile iron pipe functional layer by an SHS centrifugal method comprises the steps of firstly carrying out the SHS centrifugal method to generate Al under the condition that reactants and reaction conditions are fixed 2 O 3 And (3) ceramic layer test, namely determining the temperature rise interval of the outer surface of the ductile iron pipe, taking a plurality of quantitative detection materials capable of being sintered or cladded as a second functional layer material, carrying out the same condition test, verifying the temperature points suitable for sintering or cladding, carrying out qualitative or quantitative analysis, and correspondingly recording the temperature points of the outer surface of each ductile iron pipe adopted in the verification process as the temperature parameters of the inner pipe of the ductile iron pipe in a qualitative or quantitative mode. The method can measure and calculate the temperature of the inner surface of the ductile iron pipe by an indirect measurement method, can provide a more accurate basis than manual experience, and provides an application basis for sintering or cladding of a composite functional layer while preparing a ceramic layer on the inner surface of the ductile iron pipe by an SHS centrifugal method, so that the SHS centrifugal method can be adopted to generate Al on the inner surface of the ductile iron pipe during specific application 2 O 3 The ceramic layer and other wear-resistant, corrosion-resistant and temperature-resistant functional layers.

Description

Inner tube temperature estimation method for preparing ductile iron pipe functional layer by SHS centrifugal method and application thereof
Technical Field
The invention relates to the technical field of cast tube surface treatment, in particular to an inner tube temperature estimation method for preparing a ductile iron tube functional layer by an SHS centrifugal method and application thereof.
Background
Ductile iron pipes, i.e., ductile iron pipes, also known as cast iron steel pipes, are a high-strength cast iron material, have good toughness and corrosion resistance, and are often used as underground pipelines. After the ductile iron pipe is cast and subjected to heat treatment, the inner wall of the ductile iron pipe is subjected to surface treatment, and a functional coating is added to adapt to complex working condition requirements.
The preparation of the ductile iron pipe ceramic layer by the SHS centrifugal method is a very quick surface coating preparation process with industrialization advantages, and the ductile iron pipe ceramic layer prepared by the SHS centrifugal method has wide application due to high temperature resistance, wear resistance and corrosion resistance.
At present, in the practice of preparing the ductile iron pipe ceramic layer by the SHS centrifugal method, the implementation of the SHS centrifugal process is generally an independent process step, if defects are generated in the preparation process, the defects need to be compensated in the subsequent process, and after the self-generated ceramic layer is prepared by the SHS centrifugal method, other composite functional layers also need to be implemented by another coating process.
According to the reports disclosed at present, other coating processes are not carried out while the SHS centrifugal method is carried out, mainly because the SHS technology is a high-temperature synthesis technology, the reaction is rapid, the heat release is rapid, the interior of the ductile iron pipe can be raised to high temperature of thousands of degrees in the synthesis process, the inner surface of the ductile iron pipe is filled with liquid phase, the pipe is also filled with reaction gas, and the main coating condition, namely the temperature, is not easy to measure and control.
Disclosure of Invention
In order to solve the problems, the invention provides an estimation method of the inner tube temperature when the functional layer of the ductile iron tube is prepared by the SHS centrifugal method and application thereof.
The purpose of the invention is realized by the following technical scheme.
The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method comprises the following steps:
(1) taking a plurality of quantitative thermite reaction raw materials according to the designed ratio of the thermite reaction raw materials, defining the quantitative thermite reaction raw materials as standard quantity raw materials M1, and taking a plurality of quantitative detection materials which can be sintered or cladded, defining the quantitative detection materials as standard quantity detection materials M2;
(2) preparing a non-contact type temperature measuring instrument, connecting the non-contact type temperature measuring instrument with a computer, and taking a plurality of detection points on the outer surface of the ductile iron pipe as target points to prepare temperature measurement;
(3) adding a standard amount of raw material M1 in the step (1) into the inner surface of the ductile iron pipe, and generating Al on the inner surface of the ductile iron pipe by an SHS centrifugal method under the high-speed rotation condition defined as standard rotation speed V after ignition 2 O 3 A ceramic layer, a non-contact thermodetector for continuously measuring the temperature of a plurality of detection points on the outer surface of the ductile iron pipe, and a computer for recording the peak temperature T of the outer surface h At peak temperature T h And a certain temperature point T below the peak temperature l Selecting a plurality of temperature points randomly in an interval, and performing independent functional layer preparation tests respectively, wherein the independent functional layer preparation tests refer to the following steps: starting an independent SHS centrifugal method at the same standard rotation speed V to generate Al by using the same standard amount of raw material M1 at the same initial temperature 2 O 3 In the ceramic layer process, the temperature measuring instrument measures the temperature of the outer surface of the ductile iron pipe according to the same detection point as the step (2), and when the temperature of the outer surface of the ductile iron pipe reaches the randomly selected temperature point, a standard quantity detection material M2 prepared in the step (1) is added to complete the independent functional layer preparation test;
(4) and (3) checking and analyzing the structure of the functional layer tissue prepared in the step (3), qualitatively or quantitatively evaluating the tissue obtained after a standard quantity detection material M2 is put into each randomly selected temperature point, selecting two temperature points with better sintering or cladding verification effect as new verification intervals, reselecting the points, repeating the independent functional layer preparation test in the step (3) until a material feeding temperature point meeting the best sintering or cladding verification effect is obtained, and correspondingly recording the temperature points on the outer surface of each ductile iron pipe adopted in the verification process as the temperature parameters of the inner pipe of the ductile iron pipe in a qualitative or quantitative mode.
In the method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method, the number of the detection points in the step (2) is more than two.
In the method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method, at least one detection point is selected from the two end parts and the middle part of the outer surface of the ductile iron pipe, and preferably more than two detection points are selected.
In the method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method, the average temperature of a plurality of detection points is taken as the recording temperature by a computer.
In the method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method, in the step (4), the tissue obtained after the standard quantity detection material M2 is added at each randomly selected temperature point is qualitatively or quantitatively evaluated by means of physical observation, metallographic analysis and/or element detection.
In the method for estimating the temperature of the inner tube when the functional layer of the ductile iron tube is prepared by the SHS centrifugation method, in the step (4), the temperature points on the outer surface of each ductile iron tube used in the verification process are correspondingly recorded as the temperature parameters of the inner tube of the ductile iron tube in a qualitative or quantitative manner, and the predicted temperature interval is used as the final recording result.
The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method, wherein the temperature point T which is lower than the peak temperature in the step (3) l As determined empirically.
The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method is applied to the preparation of the composite functional layer of the ductile iron pipe.
The application adopts the SHS centrifugal method to generate Al as the first functional layer on the inner surface of the ductile iron pipe 2 O 3 And the ceramic layer is used for estimating the temperature of the inner surface of the ductile iron pipe, feeding or spraying the raw material of the second functional layer when the temperature reaches the process sintering temperature or the process hot melting temperature interval of the second functional layer, and sintering or cladding by using the SHS reaction waste heat to obtain the second functional layer.
For the above applications, the second functional layer is a Cu-based powder material.
The invention has the beneficial effects that:
the invention provides an estimation method of inner tube temperature when preparing a ductile iron pipe functional layer by an SHS centrifugal method and application thereofWhen in use, the SHS centrifugal method can be adopted to generate Al as a first functional layer on the inner surface of the ductile iron pipe 2 O 3 The ceramic layer is used for estimating the temperature of the inner surface of the ductile iron pipe, when the process sintering temperature or the process hot melting temperature interval of the second functional layer is reached, the raw material of the second functional layer is fed or sprayed, the second functional layer is obtained by sintering or cladding by using the SHS reaction waste heat, the good matching of different functional layers can be realized by more accurate feeding time precision and a faster process by combining with the optimized coating material, and experiments prove that copper-based reinforcing materials, copper and zinc metal coatings and the like can be well prepared by the scheme of the invention, so that the ductile iron pipe can obtain a composite function and a reinforcing effect.
Detailed Description
Example 1
The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method comprises the following steps:
(1) taking a plurality of quantitative thermite reaction raw materials according to the designed ratio of the thermite reaction raw materials, defining the quantitative thermite reaction raw materials as standard quantity raw materials M1, and taking a plurality of quantitative detection materials which can be sintered or cladded, defining the quantitative detection materials as standard quantity detection materials M2;
(2) preparing a non-contact type temperature measuring instrument, connecting the non-contact type temperature measuring instrument with a computer, and preparing temperature measurement by taking two detection points selected from two ends and the middle part of the outer surface of the ductile iron pipe as target points;
(3) adding a standard amount of raw material M1 in the step (1) into the inner surface of the ductile iron pipe, and generating Al on the inner surface of the ductile iron pipe by an SHS centrifugal method under the high-speed rotation condition defined as standard rotation speed V after ignition 2 O 3 The ceramic layer is used for continuously measuring the temperature of a plurality of detection points on the outer surface of the ductile iron pipe by the non-contact temperature measuring instrument, and the average temperature of the detection points is used as the recording temperature by the computer to record the peak temperature T of the outer surface h At peak temperature T h And a certain temperature point T below the peak temperature l (empirically determined) as an interval, randomly selecting a plurality of temperature points in the interval, and respectively performing independent functional layer preparation tests, wherein the independent functional layer preparation tests refer to the following steps: starting independent SHS centrifugation method at the same initial temperature and the same standard amount of raw material M1 and the same standard rotation speed VAl 2 O 3 In the ceramic layer process, the temperature measuring instrument measures the temperature of the outer surface of the ductile iron pipe according to the same detection point as the step (2), and when the temperature of the outer surface of the ductile iron pipe reaches the randomly selected temperature point, a standard quantity detection material M2 prepared in the step (1) is added to complete the independent functional layer preparation test;
(4) and (3) inspecting and analyzing the structure of the functional layer prepared in the step (3), qualitatively or quantitatively evaluating the structure obtained after the standard quantity detection material M2 is put into each randomly selected temperature point by means of physical observation, metallographic analysis and/or element detection, selecting two temperature points with better sintering or cladding verification effect as new verification intervals, reselecting the points, repeating the independent functional layer preparation test in the step (3) until the feeding temperature point meeting the best sintering or cladding verification effect is obtained, and correspondingly recording the outer surface temperature points of the ductile iron pipes adopted in the verification process as the temperature parameters of the ductile iron pipes (which can be expressed as predicted temperature intervals) in a qualitative or quantitative mode.
The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method is applied to the preparation of the composite functional layer of the ductile iron pipe, and particularly, Al serving as a first functional layer is generated on the inner surface of the ductile iron pipe by the SHS centrifugal method 2 O 3 And the ceramic layer is used for estimating the temperature of the inner surface of the ductile iron pipe, feeding or spraying the raw material of the second functional layer when the temperature reaches the process sintering temperature or the process hot melting temperature interval of the second functional layer, and sintering or cladding by using the SHS reaction waste heat to obtain the second functional layer.
Example 2
The preparation of the ductile iron pipe composite functional layer by using the method for estimating the temperature of the inner tube when the ductile iron pipe functional layer is prepared by the SHS centrifugal method in the embodiment 1 comprises the following steps: (1) generating Al as a first functional layer on the inner surface of the ductile iron pipe by an SHS method under the condition of high-speed rotation (more than or equal to 300 rpm) 2 O 3 The mass proportion of Al powder in the adopted thermite raw materials is 30%, and the dosage of the thermite raw materials is 20-40Kg relative to one ton of castings of the ductile iron pipe; (2) inner tube temperature estimation method for ball in preparation of ductile iron pipe functional layer by SHS centrifugal method in example 1Estimating the temperature of the inner surface of the iron pipe, judging that the inner surface basically reaches the process sintering temperature or the process hot melting temperature interval of the second functional layer, feeding or spraying raw materials of the second functional layer, sintering or cladding the second functional layer by using the SHS reaction waste heat in the step (1), and at least partially covering the first functional layer by the second functional layer, wherein the theoretical process sintering temperature or the process hot melting temperature interval of the raw materials of the second functional layer is generally controlled within the limit of not more than 1600 ℃.
Example 3
The ductile iron pipe containing the Cu-based wear-resistant and corrosion-resistant functional layer is further prepared by the process of example 2, the mass ratio of Al powder in the adopted aluminothermic raw material is 30% (chromium oxide and 1.5% silica additive which account for 2% of the aluminothermic raw material mass ratio can be properly added), the consumption of the aluminothermic raw material is 40Kg relative to one ton of the casting of the ductile iron pipe, the inner surface temperature of the ductile iron pipe is estimated by the inner tube temperature estimation method when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method described in example 1, the process sintering temperature range 950-1200 ℃ where the inner surface has basically reached Cu-25% WC is judged (the temperature in sintering is reduced and can be controlled to be more than 1000 ℃ as far as possible), the mixed raw material of Cu-25% WC (the particle size of WC is micron), the sintering or the functional layer of the second functional layer is carried out by the SHS reaction residual heat, the copper-based material fills the reaction vacancy of the first functional layer, and can form a continuous second functional layer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

  1. The method for estimating the temperature of the inner tube when the functional layer of the ductile iron pipe is prepared by the SHS centrifugal method is characterized by comprising the following steps of:
    (1) taking multiple quantitative thermite reaction raw materials according to the designed ratio of the thermite reaction raw materials, defining the raw materials as standard quantity raw materials M1, and taking multiple quantitative detection materials of a sintered or claddable Cu-based powder material, defining the detection materials as standard quantity detection materials M2;
    (2) preparing a non-contact type temperature measuring instrument, connecting the non-contact type temperature measuring instrument with a computer, and taking a plurality of detection points on the outer surface of the ductile iron pipe as target points to prepare temperature measurement;
    (3) adding a standard amount of raw material M1 obtained in the step (1) into the inner surface of the ductile iron pipe, and generating Al serving as a first functional layer on the inner surface of the ductile iron pipe through an SHS centrifugal method under the high-speed rotation condition defined as a standard rotation speed V after ignition 2 O 3 A ceramic layer, wherein a plurality of detection points on the outer surface of the ductile iron pipe are subjected to continuous temperature measurement by a non-contact temperature measuring instrument, and the peak temperature T of the outer surface is recorded by a computer h At peak temperature T h And a certain temperature point T below the peak temperature l Selecting a plurality of temperature points randomly in an interval, and performing independent functional layer preparation tests respectively, wherein the independent functional layer preparation tests refer to the following steps: at the same initial temperature, the same standard amount of raw material M1 is adopted, and the independent SHS centrifugal method is started at the same standard rotating speed V to generate Al 2 O 3 In the ceramic layer process, the temperature measuring instrument measures the temperature of the outer surface of the ductile iron pipe according to the same detection point as the step (2), when the temperature of the outer surface of the ductile iron pipe reaches the randomly selected temperature point, a standard quantity detection material M2 prepared in the step (1) is added, and a second functional layer is obtained by sintering or cladding through SHS reaction waste heat, so that the independent functional layer preparation test is completed; wherein the theoretical process sintering temperature or the process hot melting temperature interval of the standard quality testing material M2 does not exceed 1600 ℃;
    (4) and (4) checking and analyzing the structure of the functional layer tissue prepared in the step (3), qualitatively or quantitatively evaluating the tissue obtained after a standard quantity detection material M2 is put into each randomly selected temperature point, selecting two temperature points with better sintering or cladding verification effect as new verification intervals, reselecting the points, repeating the independent functional layer preparation test in the step (3) until the feeding temperature points meeting the best sintering or cladding verification effect are obtained, and correspondingly recording the temperature points on the outer surface of each ductile iron pipe adopted in the verification process as the temperature parameters of the inner pipe of the ductile iron pipe in a qualitative or quantitative mode.
  2. 2. The method for estimating the temperature of the inner tube during the preparation of the ductile iron pipe functional layer by the SHS centrifugal method according to claim 1, wherein the number of the detection points in the step (2) is two or more.
  3. 3. The method of estimating the temperature of an inner tube in the manufacture of a functional layer of a ductile iron pipe by SHS centrifugation according to claim 2, wherein at least one detection point is selected at each of both end portions and a middle portion of the outer surface of the ductile iron pipe.
  4. 4. The method for estimating the temperature of the inner tube in the process of manufacturing a functional layer of a ductile iron pipe by the SHS centrifugal method according to claim 3, wherein two or more detection points are selected at each of the two end portions and the middle portion of the outer surface of the ductile iron pipe.
  5. 5. The method for estimating the temperature of the inner tube during the manufacturing of the ductile iron pipe functional layer according to claim 3, wherein the computer uses the average temperature of the plurality of detection points as the recording temperature.
  6. 6. The method for estimating the temperature of the inner tube during the preparation of the functional layer of the ductile iron pipe by the SHS centrifugal method according to claim 1, wherein the qualitative or quantitative evaluation of the structure obtained after the standard quantity test material M2 is added at each randomly selected temperature point in the step (4) is performed by means of physical observation, metallographic analysis and/or element detection.
  7. 7. The method for estimating the temperature of the inner tube during the manufacturing of the functional layer of the ductile iron pipe by the SHS centrifugation method according to claim 1, wherein the step (4) of recording the temperature points of the outer surface of each ductile iron pipe used in the verification process as the temperature parameters of the inner tube of the ductile iron pipe in a qualitative or quantitative manner comprises recording the predicted temperature interval as the final recording result.
  8. 8. The SHS centrifuge of claim 1, wherein said SHS centrifuge is configured to provide a ductile iron pipe functional layer having an inner pipe temperatureThe method of estimating the temperature of the object is characterized in that the temperature point T lower than the peak temperature in the step (3) l As determined empirically.
  9. 9. The use of the method for estimating the temperature of an inner tube during the preparation of a ductile iron pipe functional layer by the SHS centrifugation method according to any one of claims 1 to 8 for the preparation of a ductile iron pipe composite functional layer.
  10. 10. Use according to claim 9, characterized in that Al is produced as a first functional layer on the interior surface of the ductile iron pipe by SHS centrifugation 2 O 3 And the ceramic layer is used for estimating the temperature of the inner surface of the ductile iron pipe, feeding or spraying the raw material of the second functional layer when the temperature reaches the process sintering temperature or the process hot melting temperature interval of the second functional layer, and sintering or cladding by using the SHS reaction waste heat to obtain the second functional layer.
CN202011250381.0A 2020-11-11 2020-11-11 Inner tube temperature estimation method in preparation of ductile iron pipe functional layer by SHS centrifugal method and application thereof Active CN112538624B (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6171709B1 (en) * 1995-09-27 2001-01-09 The Ishizuka Research Institute, Ltd. Super-abrasive grain-containing composite material and method of making

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Publication number Priority date Publication date Assignee Title
JPH03277780A (en) * 1990-03-28 1991-12-09 Deitsupusoole Kk Method for coating surface of aluminum substrate having ceramic coating film

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6171709B1 (en) * 1995-09-27 2001-01-09 The Ishizuka Research Institute, Ltd. Super-abrasive grain-containing composite material and method of making

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
自蔓延熔铸法制备CuCr合金及表征;豆志河等;《东北大学学报(自然科学版)》;20060228(第02期);全文 *

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