CN105503033A - Gasket for thermal simulation test and preparation method thereof - Google Patents
Gasket for thermal simulation test and preparation method thereof Download PDFInfo
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- CN105503033A CN105503033A CN201410502304.8A CN201410502304A CN105503033A CN 105503033 A CN105503033 A CN 105503033A CN 201410502304 A CN201410502304 A CN 201410502304A CN 105503033 A CN105503033 A CN 105503033A
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Abstract
The invention discloses a gasket for thermal simulation test and a preparation method thereof, belonging to the field of detection of material performance. The gasket comprises the following components by weight: 60 to 70% of metal powder, 25 to 35% of glass powder and 3 to 5% of a binder, wherein the particle sizes of the metal powder and the glass powder are both in a micro-nano order. The preparation method for the gasket comprises the following steps: fully mixing the metal powder with glass powder; then adding the binder; and carrying out adequate stirring and then carrying out tableting so as to obtain a thin piece which is the gasket used for reducing nonuniform sample deformation caused by friction and cooling in thermal simulation test. The invention has the following advantages: due to existence of the metal powder, the gasket can be heated through induction; and due to existence of the glass powder, problems in cooling of an end part can be overcome, and a friction coefficient between a pressure head and a sample can be reduced.
Description
Technical field
The present invention relates to a kind of for pad in thermal modeling test and preparation method thereof, belong to material property detection field.
Background technology
Thermodynamic simulated experiment machine is a kind of experimental installation for research material at high temperature deformational behavior, mainly contain compression, stretching, reverse three kinds of modes of texturing, wherein being most widely used of compression set, especially in rolling metal processing industry, is formulate the indispensable equipment of complete processing.But there are two unfavorable factors when carrying out compression testing in this equipment.One is that friction between sample end and pressure head makes sample be subject to a radial constraint at end surface, makes sample deformation uneven, thus produces cydariform and cause the uneven distribution of strain, makes to be organized accurately.For the impact of friction on distortion, after usual employing distortion, sample mid diameter and sample end diameter ratio d describe, this ratio is larger, then show that friction is larger on the uneven impact of distortion sample deformation, thus it is larger on the impact of strain distribution, (without frictional influence) this ratio is 1 in the ideal case, and when not taking lubricant method this ratio about 1.3 ~ 1.4; Two is that the temperature of pressure head is lower, is room temperature before general experiment.And when compression experiment, sample can be heated to about 800 ~ 1200 DEG C.There is thermal conduction between such sample end and pressure head, thus make sample end region temperature on the low side, cause sample bulk deformation uneven, cause test cannot obtain tissue and resistance to deformation accurately.For end cooling impact assessment, usually use and keep the length at original sample diameter dimension position and this standard of ratio s of original sample length, the impact of this ratio larger end cooling is larger.(when namely cooling without end) this ratio is 0 in the ideal case, and this ratio can reach about 0.4 in the material that some heat-conduction coefficient is lower.
People are comparatively abundant to the understanding of thermal simulation experiment for friction traditionally, so take multiple means to reduce the impact of friction, reduce frictional force as placed the lubricants such as pure graphite flake in the middle of sample and pressure head.But although this measure effectively reduces frictional force, the uneven distortion caused of sample end region temperature caused due to the thermal conduction between sample and pressure head minimizing is uneven without any effect.This is because graphite flake can only be normal temperature clamping when clamping, graphite flake itself can not sensedly heat, therefore when sample is heated to high temperature (900 ~ 1200 DEG C), cause thermal conduction therebetween that sample end can be caused to cool because sample and graphite flake exist the larger temperature difference, therefore graphite flake can only play and reduces friction and cannot change end cooling problem.Because sample is sensed heating, between sample and pressure head, therefore install tinsel additional is an effective means solving the lower sample deformation problem of non-uniform caused of sample end region temperature.But at high temperature can produce a larger frictional force between metallic gasket and metal sample preparation, cause thus produce adverse influence.The generation of this frictional force mainly because metallic gasket can not arbitrary deformation, thus produces constraint to sample.Therefore up to the present also do not have a kind of effective means can solve the problem of friction and end cooling simultaneously, a lot of research is had also to attempt in this respect, as Chinese patent CN101182862 proposes a kind of pad of metal+graphite surface, it forms together with zinc alloy matrix is embedded in solid lubricant, its feature is still that on metal, employ graphite rod is used as lubrication, and using graphite flake to carry out lubrication with tradition is principle of uniformity.The defect of this method is to solve lubrication problem, and helpless for the sample deformation problem of non-uniform that causes of end cooling problem.Chinese patent CN101780551A proposes a kind of normal temperature lubrication sheet, this lubrication sheet has the lubricating resin layer be formed on base material, this lubricating resin layer comprises the two or more water soluble resin of the different solubility to water, and pass through microphase-separated and formed, the feature of this patent is to use resin material to lubricate, but this kind of pad is lower due to fusing point, therefore cannot at applied at elevated temperature, and thermal simulation sample carries out usually more than 700 DEG C.Chinese patent CN1257908 proposes the lubricant of a kind of metallized thermoplastic processing, particularly a kind of metal fever processing lubricant of not graphitiferous.There is two problems in this technology, first is when normal temperature for liquid, cannot clamping when thermal modeling test.But friction problem can be improved, but effect be there is no to the sample deformation problem of non-uniform that sample end cooling problem causes.Chinese patent CN1468944 proposes a kind of glass lubricant specially for hot extrusion of high temperature alloy pipe, and this technology not only has high temperature lubricating effect, also has heat-blocking action, alleviates the reduction of blank temperature; And stable chemical nature, not with blank metal generation chemical reaction; Lubricant of the present invention becomes thick at service temperatures, and lubricant effect is good.Thus improve quality product, improve production efficiency, reduce production cost.Experiment shows, adopts this technology to be enhanced about more than once than the life-span of other lubricant Extruding die of employing; Extrusion tube blank shows that quality reaches requirement; Squeeze reduces by 18% compared with other lubricant, reduces energy consumption; Slow down the reduction of Preform surface temperature, improve the plasticity of material.Compared with the boring cold rolling process of existing employing, material can save more than 10%, and efficiency can improve more than 100%, and cost reduces by more than 40%.This technology proposes its lubricant not only has lubrication, and there is heat-blocking action.But because itself can not sensedly heat, therefore certainly exist larger temperature head between itself and sample, therefore thermal conduction is inevitable, and sample end region temperature must be caused lower than the problem in heart portion, thus cause the sample deformation that causes uneven.
Summary of the invention
The present invention proposes a kind of pad, effectively can solve and adopt the hot modeling test machine of induction heating mode in experimentation because friction and end cool the uneven problem of the sample deformation caused, thus improve accuracy and the precision of thermal simulation experiment result.
To achieve these goals, the present invention is achieved by the following scheme:
For reducing in thermal modeling test the friction pad uneven with cooling the sample deformations that causes, be made up of the following component of percentage:
Metal-powder: 60 ~ 70%;
Glass powder: 25 ~ 35%;
Binding agent: 3 ~ 5%;
Wherein, the particle diameter of described metal-powder and glass powder is micro-nano, and namely the particle diameter of powder is that nanometer arrives micron order.
First, due to the existence of metal-powder, this pad can sensedly heat, and reaches the higher temperature close with sample, isolated thermal conduction between pressure head and sample, thus in alleviation prior art, sample end cools the disadvantageous effect caused thermal simulation experiment result.Its different existence being metal-powder from prior art, therefore can sensedly heat, temperature head between pad and sample is reduced, thus while playing lubricant effect, significantly can improve the sample end that sample causes due to the thermal conduction between pad and cool the sample deformation problem of non-uniform caused.
Secondly, due to the existence of glass powder, use this pad not only can solve end cooling problem and can also reduce frictional coefficient between pressure head and sample.This is because glass powder can present molten state in experimental temperature (when 800 ~ 1200 DEG C), reduce the friction between pressure head and sample, alleviate the disadvantageous effect rubbing and thermal simulation experiment is brought.In sum, use this pad can alleviate simultaneously friction and end cool the disadvantageous effect that thermal simulation experiment result is brought.
Preferably, described metal-powder is consistent with the composition of sample.
Preferably, described binding agent comprises at least one in polyvinyl butyral acetal, polyoxyethylene glycol and polyvidone.
As described herein for reducing in thermal modeling test a preparation method for the friction pad uneven with cooling the sample deformations that causes, it comprises the steps:
First metal-powder fully being mixed with glass powder, then add binding agent, after fully stirring, carry out compressing tablet, obtained thin slice, being for reducing the pad uneven with cooling the sample deformations that causes of friction in thermal modeling test.
Preferably, the diameter of described thin slice is 10 ~ 14mm, is highly 1 ~ 2mm.
The invention has the advantages that:
First, due to the existence of metal-powder, this pad can sensedly heat, and reaches the higher temperature close with sample, isolated thermal conduction between pressure head and sample, thus in alleviation prior art, sample end cools the disadvantageous effect caused thermal simulation experiment result.Its different existence being metal-powder from prior art, therefore can sensedly heat, temperature head between pad and sample is reduced, thus while playing lubricant effect, significantly can improve the sample end that sample causes due to the thermal conduction between pad and cool the sample deformation problem of non-uniform caused.
Secondly, due to the existence of glass powder, use this pad not only can solve end cooling problem and can also reduce frictional coefficient between pressure head and sample.This is because glass powder can present molten state in experimental temperature (when 800 ~ 1200 DEG C), reduce the friction between pressure head and sample, alleviate the disadvantageous effect rubbing and thermal simulation experiment is brought.In sum, use this pad can alleviate simultaneously friction and end cool the disadvantageous effect that thermal simulation experiment result is brought.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not only confined to embodiment.
Embodiment 1: titanium alloy hot simulation compression pad
A) by mass percent be 65% micron-sized titanium alloy metal-powder, 30% micron-sized glass powder fully mixes, and adds 5% binding agent polyvidone subsequently, again abundant mix and blend, obtains mixed powder;
B) use mould by fully stir after mixed powder be pressed into diameter 14mm, height 1mm thin slice, be titanium alloy hot simulation compression pad;
C) when carrying out thermal modeling test, this pad being placed in sample two ends respectively, being heated to 1000 DEG C, carry out 50% alternating compression.
D) the rear sample mid diameter of compression and sample end diameter ratio d=1.03 is measured, keep the length at original sample diameter dimension position and the ratio s=0.02 of original sample length, from d value and the s value of above-mentioned actual measurement, and the discussion combined above, can think that this pad serves the effect of good improvement friction and end cooling, sample deformation is very even.
Embodiment 2: superalloy hot simulation compression pad
A) by mass percent be 60% micron-sized superalloy metal-powder, 35% micron-sized glass powder fully mixes, and adds 5% polyvinyl butyral acetal subsequently, again abundant mix and blend, obtains mixed powder;
B) use mould by fully stir after powder be pressed into diameter 14mm, height 1mm thin slice;
C) when carrying out thermal modeling test, this pad being placed in sample two ends respectively, being heated to 1100 DEG C, carry out 50% alternating compression;
D) the rear sample mid diameter of compression and sample end diameter ratio d=1.04 is measured.Keep the length at original sample diameter dimension position and the ratio s=0.03 of original sample length.From d value and the s value of above-mentioned actual measurement, and combine discussion above, can think that this pad serves the effect of good improvement friction and end cooling, sample deformation is very even.
Embodiment 3: Precise Alloy hot simulation compression pad
A) by mass percent be 70% micron-sized Precise Alloy metal-powder, 25% micron-sized glass powder fully mixes, and with post-heating 5% polyoxyethylene glycol, abundant mix and blend again, obtains mixed powder;
B) use mould by fully stir after mixed powder be pressed into diameter 14mm, height 1mm thin slice.
C) when carrying out thermal modeling test, this pad being placed in sample two ends respectively, being heated to 900 DEG C, carry out 50% alternating compression.
D) the rear sample mid diameter of compression and sample end diameter ratio d=1.03 is measured, keep the length at original sample diameter dimension position and the ratio s=0.03 of original sample length, from d value and the s value of above-mentioned actual measurement, and the discussion combined above, can think that this pad serves the effect of good improvement friction and end cooling, sample deformation is very even.
Embodiment 4: Precise Alloy hot simulation compression pad
A) by mass percent be 65% micron-sized Precise Alloy metal-powder, 32% micron-sized glass powder fully mixes, and with post-heating 3% polyoxyethylene glycol, abundant mix and blend again, obtains mixed powder;
B) use mould by fully stir after mixed powder be pressed into diameter 14mm, height 1mm thin slice.
C) when carrying out thermal modeling test, this pad being placed in sample two ends respectively, being heated to 900 DEG C, carry out 50% alternating compression.
D) the rear sample mid diameter of compression and sample end diameter ratio d=1.05 is measured, keep the length at original sample diameter dimension position and the ratio s=0.02 of original sample length, from d value and the s value of above-mentioned actual measurement, and the discussion combined above, can think that this pad serves the effect of good improvement friction and end cooling, sample deformation is very even.
Comparative example 1: graphite flake
A) when carrying out thermal modeling test, this graphite flake being placed in sample two ends respectively, being heated to 1000 DEG C, carry out 50% alternating compression.
B) the rear sample mid diameter of compression and sample end diameter ratio d=1.2 is measured, keep the length at original sample diameter dimension position and the ratio s=0.03 of original sample length, from d value and the s value of above-mentioned actual measurement, and the discussion combined above, can think that this pad serves good improvement friction effect, but end cooling problem still exists, thus causes sample to create lantern shape, and sample deformation is uneven.
Comparative example 2:
A) when carrying out thermal modeling test, this tinsel being placed in sample two ends respectively, being heated to 1000 DEG C, carry out 50% alternating compression.
B) the rear sample mid diameter of compression and sample end diameter ratio d=1.03 is measured.Keep the length at original sample diameter dimension position and the ratio s=0.25 of original sample length.From d value and the s value of above-mentioned actual measurement, and combine discussion above, can think that this pad serves good improvement end cooling performance, but friction problem still exists, thus cause sample to create cydariform, sample deformation is uneven.
Last it is noted that above embodiment only in order to illustrate the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification sheets with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in right of the present invention.
Claims (5)
1. for the pad in thermal modeling test, it is characterized in that, be made up of the following component of percentage:
Metal-powder: 60 ~ 70%;
Glass powder: 25 ~ 35%;
Binding agent: 3 ~ 5%;
Wherein, the particle diameter of described metal-powder and glass powder is micro-nano.
2. as claimed in claim 1 for the pad in thermal modeling test, it is characterized in that, described metal-powder is consistent with the composition of sample.
3. as claimed in claim 1 for the pad in thermal modeling test, it is characterized in that, described binding agent comprises at least one in polyvinyl butyral acetal, polyoxyethylene glycol and polyvidone.
4. as described in claim 1 or 2 or 3 for a preparation method for the pad in thermal modeling test, it is characterized in that, comprise the steps:
First metal-powder fully being mixed with glass powder, then add binding agent, after fully stirring, carry out compressing tablet, obtained thin slice, being for reducing the pad uneven with cooling the sample deformations that causes of friction in thermal modeling test.
5. preparation method as claimed in claim 4, it is characterized in that, the diameter of described thin slice is 10 ~ 14mm, is highly 1 ~ 2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410502304.8A CN105503033B (en) | 2014-09-26 | 2014-09-26 | Gasket for thermal simulation test and preparation method thereof |
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| CN201410502304.8A CN105503033B (en) | 2014-09-26 | 2014-09-26 | Gasket for thermal simulation test and preparation method thereof |
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| CN105503033A true CN105503033A (en) | 2016-04-20 |
| CN105503033B CN105503033B (en) | 2017-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240963A (en) * | 2016-12-23 | 2018-07-03 | 宝钢特钢有限公司 | A kind of method that friction coefficient is measured using thermo dynamic analogy machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462381A (en) * | 1987-09-02 | 1989-03-08 | Mitsubishi Heavy Ind Ltd | High-excellent gasket |
| CN1468944A (en) * | 2002-07-19 | 2004-01-21 | 中国科学院金属研究所 | Prepn and application of glass lubricant specially for hot extrusion of high temperature alloy pipe |
| CN101182862A (en) * | 2007-12-20 | 2008-05-21 | 姚祖胜 | Zinc-radical abrasion resistant alloy self-lubricated bearing, slide board, pad and manufacturing method |
| CN202676535U (en) * | 2012-06-20 | 2013-01-16 | 鞍钢股份有限公司 | Anvils for quenching thermal simulation test piece |
-
2014
- 2014-09-26 CN CN201410502304.8A patent/CN105503033B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462381A (en) * | 1987-09-02 | 1989-03-08 | Mitsubishi Heavy Ind Ltd | High-excellent gasket |
| CN1468944A (en) * | 2002-07-19 | 2004-01-21 | 中国科学院金属研究所 | Prepn and application of glass lubricant specially for hot extrusion of high temperature alloy pipe |
| CN101182862A (en) * | 2007-12-20 | 2008-05-21 | 姚祖胜 | Zinc-radical abrasion resistant alloy self-lubricated bearing, slide board, pad and manufacturing method |
| CN202676535U (en) * | 2012-06-20 | 2013-01-16 | 鞍钢股份有限公司 | Anvils for quenching thermal simulation test piece |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240963A (en) * | 2016-12-23 | 2018-07-03 | 宝钢特钢有限公司 | A kind of method that friction coefficient is measured using thermo dynamic analogy machine |
| CN108240963B (en) * | 2016-12-23 | 2020-06-12 | 宝武特种冶金有限公司 | Method for measuring friction coefficient by using thermal simulator |
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| CN105503033B (en) | 2017-05-24 |
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Effective date of registration: 20200513 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Patentee after: Baowu Special Metallurgy Co., Ltd Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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