CN107628814A - A kind of silicon carbide ceramics valve and preparation method thereof - Google Patents
A kind of silicon carbide ceramics valve and preparation method thereof Download PDFInfo
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- CN107628814A CN107628814A CN201610560974.4A CN201610560974A CN107628814A CN 107628814 A CN107628814 A CN 107628814A CN 201610560974 A CN201610560974 A CN 201610560974A CN 107628814 A CN107628814 A CN 107628814A
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Abstract
The present invention relates to a kind of silicon carbide ceramics valve and preparation method thereof.Its component and weight proportion are：90 95 parts of silicon carbide micro-powder, 13 parts of boron carbide, 13 parts of carbon dust, 26 parts of titanium boride, resin dedicated 5 15 parts, 15 parts of slurry conditioning agent, finished through ultra fine, material by wet type mixing, mist projection granulating, dry-pressing formed, green compact solidification, green compact preprocessing, high temperature sintering and finished product and the final ceramic valve for meeting dimensional accuracy is made.Present invention process is simple, improve green strength, near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, so that each position uniform force of green compact, each position intensity is consistent, and size is consistent, uses carborundum as ceramic valve material, available under the heavy corrosion operating mode of various strong acid and highly basic, its hardness highest in ceramics.
Description
Technical field
The present invention relates to a kind of silicon carbide ceramics valve and preparation method thereof.
Background technology
Valve is the control unit in fluid delivery system, for control the direction of fluid, pressure, flow device, pass
The valve of system is substantially metal valve, and metal valve is limited by metal material attribute, it is impossible to adapt to more and more higher abrasion,
The demand of the bad working environments such as deep-etching, it is short to be mainly reflected in service life, and leakage is serious, leverages the stabilization of system operation
Property.Ceramic valve has excellent high-temperature mechanical property, resistance to chemical corrosion, high-temperature oxidation compared with metal material
Can, the advantages that abrasion resistance properties and proportion are small, ceramic valve increasingly obtains recognizing for valve industry personage with its excellent performance
Together, traditional ceramic valve is essentially zirconium oxide and alumina material, and both to media such as sulfuric acid, hydrochloric acid and nitric acid in temperature
Degree has good decay resistance in the case of being less than 90 degrees Celsius, but more serious to hydrofluoric acid and highly basic dielectric corrosion ratio, no
It disclosure satisfy that worse operating mode.
The content of the invention
For drawbacks described above, it is an object of the invention to provide a kind of obtained green strength height, technique is simple, each portion of green compact
Position intensity is consistent, and size is consistent, can meet a kind of silicon carbide ceramics valve and its system under the heavy corrosion operating mode of strong acid and strong base
Preparation Method.
It is for this technical solution adopted in the present invention：
Comprise the following steps：
Step 1：Purifying, ultra fine：To silicon carbide micro-powder 90-95 parts, boron carbide 1-3 parts, carbon dust 1-3 parts, titanium boride 2-6
Part, phenolic resin 5-15 parts, slurry conditioning agent 1-5 parts are purified, ultra fine；
Step 2：Material by wet type mixing：Micronization processes are carried out to coarse granule raw material using continuous circulation sand mill, using high-quality
Carborundum mill is situated between, and purificant and high-purity deionized water is added in process of lapping purification processes are carried out to raw material, final to be made
Purity is high, the slurry of fine size, milling time 24 hours, and slurry fineness is not more than 0.3 millimeter；
Step 3：Mist projection granulating：Slurry is spray-dried using centrifugal spray dryer, by controlling atomisation pressure, entering
Air temperature, leaving air temp, spray piece particle diameter obtain good particle shape, good fluidity, the granulation that particle distribution range is narrow, moisture is moderate
Powder, nozzle rotating speed are 18-20,200-230 degrees Celsius of EAT, 100-110 degrees Celsius of leaving air temp, and pelletizing index is：
Compact density is not less than 2.0g/cm3, mobility is not more than 30s/30g；
Step 4：It is dry-pressing formed：Near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, by adjusting briquetting pressure
And the dwell time, it is ensured that obtain the high ceramic green of consistency, dry-pressing formed pressure is 500 tons, unit pressure 1500kg/
cm2, isostatic cool pressing unit pressure is 2000kg/cm2, green density is not less than 2.05g/ cm3；
Step 5：Green compact solidify：The green compact suppressed are put into baking oven and are heating and curing according to the cure profile of setting, with
Green strength, while acceptable pre- anti-sintered cracking are improved, solidification temperature is 150-200 degrees Celsius, and hardening time is 5 hours；
Step 6：Green compact preprocessing：Designed using green machined center with reference to procedure, compressing ceramic green is pressed
Part, which designs a model, in the same old way carries out green compact preprocessing, obtains size and precision meets sintering and the valve green compact of final products requirement,
Reduce the working process after sintering；
Step 7：High temperature sintering：By controlling the heating curve and soaking time parameter of sintering furnace, crystal grain exact growth is controlled, is made
Product internal organizational structure it is fine and close, crystal habit and size are excellent, and sintering temperature is 2200-2250 degrees Celsius, during sintering
Between be 18 hours；
Step 8：Finished product finishes：Using ultrasonic vibrating machining center is carried out to the silicon carbide ceramics valve sintered into accurate add
Work, and carry out product surface polishing, it is ensured that the valve size precision after processing meets product requirement.
It is an advantage of the invention that：
Present invention process is simple, improves green strength, carries out near-net-shape to exemplar using dry-pressing and isostatic cool pressing method, makes
The each position uniform force of green compact is obtained, each position intensity is consistent, and size is consistent, uses carborundum to be used for ceramic valve material
Under the heavy corrosion operating mode of various strong acid and highly basic, its hardness highest in ceramics.
Embodiment
Embodiment 1
A kind of silicon carbide ceramics valve and preparation method thereof, its component and weight proportion are：90 parts of silicon carbide micro-powder, boron carbide 1
Part, 1 part of carbon dust, 2 parts of titanium boride, resin dedicated 5 parts, 1 part of slurry conditioning agent；
Comprise the following steps：
Step 1：Purifying, ultra fine：To 90 parts of silicon carbide micro-powder, 1 part of boron carbide, 1 part of carbon dust, 2 parts of titanium boride, phenolic aldehyde tree
5 parts of fat, 1 part of slurry conditioning agent is purified, ultra fine；
Step 2：Material by wet type mixing：Micronization processes are carried out to coarse granule raw material using continuous circulation sand mill, using high-quality
Carborundum mill is situated between, and purificant and high-purity deionized water is added in process of lapping purification processes are carried out to raw material, final to be made
Purity is high, the slurry of fine size, milling time 24 hours, and slurry fineness is not more than 0.3 millimeter；
Step 3：Mist projection granulating：Slurry is spray-dried using centrifugal spray dryer, by controlling atomisation pressure, entering
Air temperature, leaving air temp, spray piece particle diameter obtain good particle shape, good fluidity, the granulation that particle distribution range is narrow, moisture is moderate
Powder, nozzle rotating speed are 18,200 degrees Celsius of EAT, 100 degrees Celsius of leaving air temp, and pelletizing index is：Compact density is not small
In 2.0g/cm3, mobility is not more than 30s/30g；
Step 4：It is dry-pressing formed：Near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, by adjusting briquetting pressure
And the dwell time, it is ensured that obtain the high ceramic green of consistency, dry-pressing formed pressure is 500 tons, unit pressure 1500kg/
cm2, isostatic cool pressing unit pressure is 2000kg/cm2, green density is not less than 2.05g/ cm3；
Step 5：Green compact solidify：The green compact suppressed are put into baking oven and are heating and curing according to the cure profile of setting, with
Green strength, while acceptable pre- anti-sintered cracking are improved, solidification temperature is 150 degrees Celsius, and hardening time is 5 hours；
Step 6：Green compact preprocessing：Designed using green machined center with reference to procedure, compressing ceramic green is pressed
Part, which designs a model, in the same old way carries out green compact preprocessing, obtains size and precision meets sintering and the valve green compact of final products requirement,
Reduce the working process after sintering；
Step 7：High temperature sintering：By controlling the heating curve and soaking time parameter of sintering furnace, crystal grain exact growth is controlled, is made
The internal organizational structure densification of product is obtained, crystal habit and size are excellent, and sintering temperature is 2200 degrees Celsius, sintering time 18
Individual hour；
Step 8：Finished product finishes：Using ultrasonic vibrating machining center is carried out to the silicon carbide ceramics valve sintered into accurate add
Work, and carry out product surface polishing, it is ensured that the valve size precision after processing meets product requirement.
Embodiment 2
A kind of silicon carbide ceramics valve and preparation method thereof, its component and weight proportion are：95 parts of silicon carbide micro-powder, boron carbide 3
Part, 3 parts of carbon dust, 6 parts of titanium boride, resin dedicated 15 parts, 5 parts of slurry conditioning agent；
Comprise the following steps：
Step 1：Purifying, ultra fine：To 95 parts of silicon carbide micro-powder, 3 parts of boron carbide, 3 parts of carbon dust, 6 parts of titanium boride, phenolic aldehyde tree
15 parts of fat, 5 parts of slurry conditioning agent is purified, ultra fine；
Step 2：Material by wet type mixing：Micronization processes are carried out to coarse granule raw material using continuous circulation sand mill, using high-quality
Carborundum mill is situated between, and purificant and high-purity deionized water is added in process of lapping purification processes are carried out to raw material, final to be made
Purity is high, the slurry of fine size, milling time 24 hours, and slurry fineness is not more than 0.3 millimeter；
Step 3：Mist projection granulating：Slurry is spray-dried using centrifugal spray dryer, by controlling atomisation pressure, entering
Air temperature, leaving air temp, spray piece particle diameter obtain good particle shape, good fluidity, the granulation that particle distribution range is narrow, moisture is moderate
Powder, nozzle rotating speed are 20,230 degrees Celsius of EAT, 110 degrees Celsius of leaving air temp, and pelletizing index is：Compact density is not small
In 2.0g/cm3, mobility is not more than 30s/30g；
Step 4：It is dry-pressing formed：Near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, by adjusting briquetting pressure
And the dwell time, it is ensured that obtain the high ceramic green of consistency, dry-pressing formed pressure is 500 tons, unit pressure 1500kg/
cm2, isostatic cool pressing unit pressure is 2000kg/cm2, green density is not less than 2.05g/ cm3；
Step 5：Green compact solidify：The green compact suppressed are put into baking oven and are heating and curing according to the cure profile of setting, with
Green strength, while acceptable pre- anti-sintered cracking are improved, solidification temperature is 200 degrees Celsius, and hardening time is 5 hours；
Step 6：Green compact preprocessing：Designed using green machined center with reference to procedure, compressing ceramic green is pressed
Part, which designs a model, in the same old way carries out green compact preprocessing, obtains size and precision meets sintering and the valve green compact of final products requirement,
Reduce the working process after sintering；
Step 7：High temperature sintering：By controlling the heating curve and soaking time parameter of sintering furnace, crystal grain exact growth is controlled, is made
The internal organizational structure densification of product is obtained, crystal habit and size are excellent, and sintering temperature is 2250 degrees Celsius, sintering time 18
Individual hour；
Step 8：Finished product finishes：Using ultrasonic vibrating machining center is carried out to the silicon carbide ceramics valve sintered into accurate add
Work, and carry out product surface polishing, it is ensured that the valve size precision after processing meets product requirement.
Embodiment 3
A kind of silicon carbide ceramics valve and preparation method thereof, its component and weight proportion are：Silicon carbide micro-powder 90-95 parts, carbonization
Boron 1-3 parts, carbon dust 1-3 parts, titanium boride 2-6 parts, resin dedicated 5-15 parts, slurry conditioning agent 1-5 parts；
Comprise the following steps：
Step 1：Purifying, ultra fine：To 92 parts of silicon carbide micro-powder, 2 parts of boron carbide, 2 parts of carbon dust, 4 parts of titanium boride, phenolic aldehyde tree
10 parts of fat, 3 parts of slurry conditioning agent is purified, ultra fine；
Step 2：Material by wet type mixing：Micronization processes are carried out to coarse granule raw material using continuous circulation sand mill, using high-quality
Carborundum mill is situated between, and purificant and high-purity deionized water is added in process of lapping purification processes are carried out to raw material, final to be made
Purity is high, the slurry of fine size, milling time 24 hours, and slurry fineness is not more than 0.3 millimeter；
Step 3：Mist projection granulating：Slurry is spray-dried using centrifugal spray dryer, by controlling atomisation pressure, entering
Air temperature, leaving air temp, spray piece particle diameter obtain good particle shape, good fluidity, the granulation that particle distribution range is narrow, moisture is moderate
Powder, nozzle rotating speed are 19,215 degrees Celsius of EAT, 105 degrees Celsius of leaving air temp, and pelletizing index is：Compact density is not small
In 2.0g/cm3, mobility is not more than 30s/30g；
Step 4：It is dry-pressing formed：Near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, by adjusting briquetting pressure
And the dwell time, it is ensured that obtain the high ceramic green of consistency, dry-pressing formed pressure is 500 tons, unit pressure 1500kg/
cm2, isostatic cool pressing unit pressure is 2000kg/cm2, green density is not less than 2.05g/ cm3；
Step 5：Green compact solidify：The green compact suppressed are put into baking oven and are heating and curing according to the cure profile of setting, with
Green strength, while acceptable pre- anti-sintered cracking are improved, solidification temperature is 180 degrees Celsius, and hardening time is 5 hours；
Step 6：Green compact preprocessing：Designed using green machined center with reference to procedure, compressing ceramic green is pressed
Part, which designs a model, in the same old way carries out green compact preprocessing, obtains size and precision meets sintering and the valve green compact of final products requirement,
Reduce the working process after sintering；
Step 7：High temperature sintering：By controlling the heating curve and soaking time parameter of sintering furnace, crystal grain exact growth is controlled, is made
The internal organizational structure densification of product is obtained, crystal habit and size are excellent, and sintering temperature is 2225 degrees Celsius, sintering time 18
Individual hour；
Step 8：Finished product finishes：Using ultrasonic vibrating machining center is carried out to the silicon carbide ceramics valve sintered into accurate add
Work, and carry out product surface polishing, it is ensured that the valve size precision after processing meets product requirement.
Above product reaches following index：
Bulk density >=3.16g/cm3
Bending strength >=450Mpa
Rockwell hardness >=93
Modulus of elasticity >=450Gpa
Fracture toughness >=5.
Claims (1)
1. a kind of silicon carbide ceramics valve and preparation method thereof, it is characterised in that its component and weight proportion are：Silicon carbide micro-powder
90-95 parts, boron carbide 1-3 parts, carbon dust 1-3 parts, titanium boride 2-6 parts, resin dedicated 5-15 parts, slurry conditioning agent 1-5 parts；
Comprise the following steps：
Step 1：Purifying, ultra fine：To silicon carbide micro-powder 90-95 parts, boron carbide 1-3 parts, carbon dust 1-3 parts, titanium boride 2-6
Part, phenolic resin 5-15 parts, slurry conditioning agent 1-5 parts are purified, ultra fine；
Step 2：Material by wet type mixing：Micronization processes are carried out to coarse granule raw material using continuous circulation sand mill, using high-quality
Carborundum mill is situated between, and purificant and high-purity deionized water is added in process of lapping purification processes are carried out to raw material, final to be made
Purity is high, the slurry of fine size, milling time 24 hours, and slurry fineness is not more than 0.3 millimeter；
Step 3：Mist projection granulating：Slurry is spray-dried using centrifugal spray dryer, by controlling atomisation pressure, entering
Air temperature, leaving air temp, spray piece particle diameter obtain good particle shape, good fluidity, the granulation that particle distribution range is narrow, moisture is moderate
Powder, nozzle rotating speed are 18-20,200-230 degrees Celsius of EAT, 100-110 degrees Celsius of leaving air temp, and pelletizing index is：
Compact density is not less than 2.0g/cm3, mobility is not more than 30s/30g；
Step 4：It is dry-pressing formed：Near-net-shape is carried out to exemplar using dry-pressing and isostatic cool pressing method, by adjusting briquetting pressure
And the dwell time, it is ensured that obtain the high ceramic green of consistency, dry-pressing formed pressure is 500 tons, unit pressure 1500kg/
cm2, isostatic cool pressing unit pressure is 2000kg/cm2, green density is not less than 2.05g/ cm3；
Step 5：Green compact solidify：The green compact suppressed are put into baking oven and are heating and curing according to the cure profile of setting, with
Green strength, while acceptable pre- anti-sintered cracking are improved, solidification temperature is 150-200 degrees Celsius, and hardening time is 5 hours；
Step 6：Green compact preprocessing：Designed using green machined center with reference to procedure, compressing ceramic green is pressed
Part, which designs a model, in the same old way carries out green compact preprocessing, obtains size and precision meets sintering and the valve green compact of final products requirement,
Reduce the working process after sintering；
Step 7：High temperature sintering：By controlling the heating curve and soaking time parameter of sintering furnace, crystal grain exact growth is controlled, is made
Product internal organizational structure it is fine and close, crystal habit and size are excellent, and sintering temperature is 2200-2250 degrees Celsius, during sintering
Between be 18 hours；
Step 8：Finished product finishes：Using ultrasonic vibrating machining center is carried out to the silicon carbide ceramics valve sintered into accurate add
Work, and carry out product surface polishing, it is ensured that the valve size precision after processing meets product requirement.
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| CN201610560974.4A CN107628814A (en) | 2016-07-18 | 2016-07-18 | A kind of silicon carbide ceramics valve and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111848174A (en) * | 2020-07-30 | 2020-10-30 | 山东中鹏特种陶瓷有限公司 | Method for producing wear-resistant silicon carbide ceramic block based on press machine |
| CN113004043A (en) * | 2019-12-20 | 2021-06-22 | 湖南太子新材料科技有限公司 | Recrystallization silicon carbide product isostatic pressing forming process |
| CN114804119A (en) * | 2021-01-27 | 2022-07-29 | 山东联科科技股份有限公司 | Silicon dioxide particle size control process |
-
2016
- 2016-07-18 CN CN201610560974.4A patent/CN107628814A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113004043A (en) * | 2019-12-20 | 2021-06-22 | 湖南太子新材料科技有限公司 | Recrystallization silicon carbide product isostatic pressing forming process |
| CN111848174A (en) * | 2020-07-30 | 2020-10-30 | 山东中鹏特种陶瓷有限公司 | Method for producing wear-resistant silicon carbide ceramic block based on press machine |
| CN114804119A (en) * | 2021-01-27 | 2022-07-29 | 山东联科科技股份有限公司 | Silicon dioxide particle size control process |
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Application publication date: 20180126 |