CN103604671B - Sample treatment method for preventing adhesion between sample and pressure head in thermal simulated test machine compression test - Google Patents

Abstract

The invention relates to a sample treatment method for preventing the sample from sticking to the indenter in the compression test of the thermal simulation testing machine, in particular to a sample for preventing the sample from sticking to the indenter in the cylinder unidirectional compression test on the thermal simulation testing machine The processing method belongs to the field of heat/force simulation physics experiment. In the present invention, a ceramic tube is placed on the root of the welded thermocouple wire on the sample; high-temperature-resistant cement slurry is applied to the welding point between the thermocouple wire and the sample, and the temperature is kept at 120° C. for 1 to 3 minutes; Apply pure nickel-based high temperature resistant anti-seize agent on both ends of the sample; paste niobium sheet on pure nickel-based high temperature resistant anti-seize agent; paste graphite paper on the niobium sheet. The present invention prevents the adhesion between the sample and the indenter due to the treatment of the sample and the welding point, changes the situation that the sample and the indenter frequently stick together under high temperature conditions in the original test, improves the test success rate, and reduces the test pressure. Cost, improve the utilization rate of expensive pressure head, easy to operate.

Description

Sample treatment method to prevent the sample from sticking to the indenter in the compression test of the thermal simulation testing machine

technical field

The invention relates to a sample processing method for preventing the sample from sticking to the indenter in the compression test of a thermal simulation testing machine, in particular to a sample for preventing the sample from sticking to the indenter in the one-way compression test of a cylinder on a thermal simulation testing machine The processing method belongs to the field of heat/force simulation physics experiment.

Background technique

Gleeble1500D thermal simulation testing machine is a resistance heating full simulation device that can precisely control temperature, stress and strain parameters at the same time. Able to perform cylinder unidirectional compression test satisfactorily, use small test pieces to reproduce the physical process of materials being heated and stressed simultaneously during thermal processing, fully and accurately reveal the law of changes in the structure and properties of materials during thermal processing, and evaluate Or predict the problems that arise during thermal processing of materials, and provide theoretical guidance and technical basis for formulating reasonable processing technology and developing new materials. However, the cylinder unidirectional compression test is often carried out under high temperature conditions and kept warm for a long time. Due to the long-term high temperature conditions, the metal atoms at the end of the sample and the alloy element atoms in the indenter diffuse each other, resulting in The sample in the sample is easy to stick to the indenter. At the same time, the thermocouple wire welded on the sample is easy to fall off and touch other metal parts under high temperature for a long time, causing the sample to overheat, even melt and stick to the indenter. Cause test to fail, damage indenter at the same time, cause test cost to increase greatly.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art that the sample and the indenter stick together under high temperature conditions, and provide a method for preventing the sample from sticking to the indenter in the cylinder unidirectional compression test on a thermal simulation testing machine. The sample processing method is simple to operate, which greatly improves the test success rate and reduces the test cost.

The technical scheme that the present invention solves above technical problem is:

The inventive method step is as follows:

1) Weld the thermocouple wire on the sample, and put a ceramic tube on the exposed thermocouple wire at the welding point. The diameter of the ceramic tube is 0.5mm, and the length of the ceramic tube should cover the exposed part of the thermocouple wire welding end;

2) Preparation of high temperature resistant cement slurry: according to the mass ratio: aluminum silicate 7~15%, sodium silicate 55~65%, silicon dioxide 15~25%, mica powder 5~10%, the above ratio of silicon Alumina, sodium silicate, silica, and mica powder are fully mixed and ground into a mixture with a particle size of less than 45 μm, and the mixture and water are mixed in a ratio of 1:1 (mass ratio) and fully stirred evenly, which is high temperature resistant cement slurry;

3) Apply the prepared high-temperature-resistant cement slurry to the welding point between the thermocouple wire and the sample, and the applied high-temperature-resistant cement slurry should completely cover the welding point between the thermocouple wire and the sample, and keep it warm at 120°C 1 to 3 minutes to dry the high temperature resistant cement slurry;

4) Apply pure nickel-based high-temperature anti-seize agent on both ends of the sample, paste niobium sheet on the pure nickel-based high-temperature anti-seize agent, and stick graphite paper on the niobium sheet.

Further: The pure nickel-based high-temperature anti-seize agent is selected with a minimum heat-resistant temperature of 1400°C, and the coating thickness is 0.5mm~1mm.

Further: the niobium sheet is a square with a thickness of 0.15 mm, and the side length is 1.5 times the diameter of the sample.

Further: The niobium sheet and the pure nickel-based high-temperature anti-seize agent rely on the unique viscosity of the pure nickel-based high-temperature anti-seize agent to achieve paste.

Further: the thickness of the graphite paper is 0.5mm, the graphite paper is square, and the side length is equal to the diameter of the indenter of the testing machine.

Further: the graphite paper and the niobium sheet are bonded with conductive adhesive.

The beneficial effects of the present invention are:

1) The present invention prevents the adhesion between the sample and the indenter due to the treatment of the sample and the welding point, changes the situation of frequent adhesion between the sample and the indenter in the original test under high temperature conditions, and improves the success rate of the test.

2) The present invention reduces the test cost and improves the utilization rate of expensive indenters.

3) Easy to operate.

Description of drawings

Fig. 1 is a schematic diagram of the processing of a cylindrical unidirectional compression test sample of the present invention.

Detailed ways

Example 1

The thermal simulation testing machine model that the present invention adopts is Gleeble1500D. The cylinder unidirectional compression test is carried out on the thermal simulation testing machine. The size of the sample 1 is Φ10×15mm. The thermocouple wire 7 is welded on the sample according to the test requirements. The exposed part of the welding end of the thermocouple wire 7 is 10mm, and the diameter is selected as 0.5 mm, long 10mm ceramic casing 6, completely cover the exposed part of thermocouple wire 7; get 2 grams of aluminum silicate, 12 grams of sodium silicate, 5 grams of silicon dioxide, 1 gram of mica powder and mix and grind until the particle size is less than 45 μm, add 20 grams of water, stir evenly to make high-temperature resistant cement slurry 5, take high-temperature resistant cement slurry 5 and apply it on the welding point of thermocouple wire 7, heat sample 1 to 120 ° C for 2 minutes; select heat-resistant temperature THRED GARD brand pure nickel-based high-temperature anti-seize agent 4 at 1427°C, evenly spread on both ends of sample 1, with a thickness of 1mm; Paste the niobium sheet 3 that thickness is 0.15mm again on the top again, and the niobium sheet 3 is the square that side length is 15mm; Paste graphite paper 2 again on the niobium sheet 3 with conductive adhesive, the thickness of graphite paper 2 is 0.5mm, and side length and The diameter of the indenter of the testing machine is equal, and the diameter of the indenter of the testing machine is 20mm.

During the experiment, the above-mentioned treated sample was put into the thermal simulation testing machine, and clamped by the indenter 8, which prevented the adhesion of the sample and the indenter, and changed the frequent test between the sample and the indenter under high temperature conditions in the original test. In the event of adhesion, the success rate of the test is improved.

Example 2

The thermal simulation testing machine model that the present invention adopts is Gleeble1500D. The cylinder unidirectional compression test is carried out on the thermal simulation testing machine. The size of the sample 1 is Φ8×12mm. The thermocouple wire 7 is welded on the sample according to the test requirements. The exposed part of the welding end of the thermocouple wire 7 is 8mm, and the diameter is 0.5 mm. mm, long 8mm ceramic casing 6, completely cover the exposed part of thermocouple wire 7; get 2.4 grams of aluminum silicate, 11 grams of sodium silicate, 4 grams of silicon dioxide, 2.6 grams of mica powder and mix and grind until the particle size is less than 45 μm, add 20 grams of water, stir evenly to make high-temperature resistant cement slurry 5, take high-temperature resistant cement slurry 5 and apply it on the welding point of thermocouple wire 7, heat sample 1 to 120 ° C for 2 minutes; select heat-resistant temperature AiBOND brand 76701 series pure nickel-based high-temperature anti-seize agent 4 at 1483°C, evenly applied to both ends of sample 1, with a thickness of 1 mm; The niobium sheet 3 with a thickness of 0.15mm is pasted on the end, and the niobium sheet 3 is a square with a side length of 12mm; the graphite paper 2 is pasted on the niobium sheet 3 with conductive glue, the thickness of the graphite paper 2 is 0.5mm, and the side length is the same as that of the testing machine. The diameter of the indenter is equal to 20mm.

During the experiment, the above-mentioned treated sample was put into the thermal simulation testing machine, and clamped by the indenter 8, which prevented the adhesion of the sample and the indenter, and changed the frequent test between the sample and the indenter under high temperature conditions in the original test. In the event of adhesion, the success rate of the test is improved.

Claims (6)

1. prevent the sample processing method of sample and pressure head adhesion in hot modeling test machine compression test, it is characterized in that, method step is as follows:

1) be welded on sample by thermocouple wire, the thermocouple wire that solder joint is exposed overlaps ceramic pipe, ceramic pipe diameter is 0.5mm, and length will envelope thermocouple wire welding end exposed part;

2) preparation of high temperature resistant cement oar: by quality proportioning: alumina silicate 7 ~ 15%, sodium silicate 55 ~ 65%, silica 15 ~ 25%, mica powder 5 ~ 10%, the alumina silicate of aforementioned proportion, sodium silicate, silicon dioxide, mica powder are fully mixed and is ground to the potpourri that granularity is less than 45 μm, by potpourri and water in mass ratio 1:1 stir, be high temperature cement slurry;

3) high temperature cement slurry prepared is spread upon the pad place of thermocouple wire and sample, and the high temperature cement slurry smeared to wrap the pad of thermocouple wire and sample completely, be incubated 1 ~ 3 minute at temperature 120 DEG C, high temperature cement slurry is dried;

4) in the both ends of the surface of sample, be coated with pure nickel based high-temp-resistant seizureproof agent respectively, pure nickel based high-temp-resistant seizureproof agent paste niobium sheet, niobium sheet posts graphite paper.

2. the sample processing method preventing sample and pressure head adhesion in hot modeling test machine compression test according to claim 1, is characterized in that, pure nickel based high-temp-resistant seizureproof agent selects minimum heat resisting temperature to reach 1400 DEG C, and smearing thickness is 0.5mm ~ 1mm.

3. the sample processing method preventing sample and pressure head adhesion in hot modeling test machine compression test according to claim 1, is characterized in that, the square of niobium sheet to be thickness be 0.15mm, the length of side is 1.5 times of specimen finish.

4. the sample processing method preventing sample and pressure head adhesion in hot modeling test machine compression test according to claim 1, is characterized in that, niobium sheet and pure nickel based high-temp-resistant seizureproof agent rely on the distinctive viscosity of pure nickel based high-temp-resistant seizureproof agent to realize pasting.

5. the sample processing method preventing sample and pressure head adhesion in hot modeling test machine compression test according to claim 1, is characterized in that, graphite paper thickness is 0.5mm, and graphite paper is square, the equal diameters of the length of side and pressure head of testing machine.

6. prevent the sample processing method of sample and pressure head adhesion in hot modeling test machine compression test according to claim 1 or 5, it is characterized in that, graphite paper and niobium sheet conducting resinl realize adhesion.