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Method for characterizing mixture reinforced thermo plastics (RTP) particle hardness

A technology of mixing materials and particles, applied in the direction of testing material hardness, etc., can solve the problems of easy crushing, soft agglomeration of particle structure, large measurement error, etc., and achieve the effect of ensuring production quality, good reproducibility and simple method.

Active Publication Date: 2013-03-20
XIAMEN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the hardness of the particles is mainly characterized by the method of microhardness, but it is not suitable for the RTP particles of the mixture in powder metallurgy. The main reasons are: first, the RTP particles of the mixture are relatively small, and the average particle size is about 80-200um. To measure the microhardness, samples must be mounted, but it is difficult to mount samples with RTP particles of the mixture, because the particle structure is soft and agglomerated and relatively loose, and the samples are easily crushed during mounting; There is no way to polish; third, due to the low hardness of the RTP particles of the mixture, the measurement error is large, and the result is not reproducible; fourth, the microhardness reflects the individual, reflecting the hardness of certain particles, while During the pressing process, more attention is paid to the overall softness and hardness of the particles
[0004] Because the hardness of the RTP particles of the mixture directly affects its pressing performance, and the hardness of the RTP particles of the mixture is currently not monitored in the industry, which affects the production quality of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for characterizing the hardness of the mixture RTP particles of the present invention, wherein the mixture RTP particles are composed of 0.8um WC-10%Co-2% paraffin and other necessary additives, the method for characterizing the hardness of the mixture RTP particles , including the following steps:

[0021] (1) Take 50 grams of cemented carbide mixture (that is, the mixture RTP containing 0.8um WC-10%Co-2% paraffin and other necessary additives);

[0022] (2) Use the national standard GB-T 6003 standard screen Φ200*50-0.09 / 0.063 to sieve to remove fine powder;

[0023] (3) Take 20 grams of sieved material, use a 15*20mm mold, and use a loading speed of 5mm / s, and a pressing force per unit area of ​​3Kg / cm 2 , the holding time is 5 seconds, and pressed into cubes; at this time, the powder particles in the cubes have very little binding force, and some powder particles with lower strength have been crushed;

[0024] (4) Then use a wool brush with a hair length ...

Embodiment 2

[0029] A method for characterizing the hardness of the mixture RTP particles of the present invention, wherein the mixture RTP particles are composed of 3.5um WC-6%Co-2% paraffin and other necessary additives, the method for characterizing the hardness of the mixture RTP particles , including the following steps:

[0030] (1) Take 50 grams of cemented carbide mixture (that is, the mixture RTP containing 3.5um WC-6%Co-2% paraffin and other necessary additives);

[0031] (2) Use the national standard GB-T 6003 standard screen Φ200*50-0.09 / 0.063 to sieve to remove fine powder;

[0032] (3) Take 20 grams of sieved material, use a 15*20mm mold, and use a loading speed of 5mm / s, and a pressing force per unit area of ​​3Kg / cm 2 , the holding time is 5 seconds, and pressed into cubes; at this time, the powder particles in the cubes have very little binding force, and some powder particles with lower strength have been crushed;

[0033] (4) Then use a wool brush with a hair length of...

Embodiment 3

[0037] A method for characterizing the hardness of the mixture RTP particles of the present invention, wherein the mixture RTP particles are composed of 10.0um WC-12%Co-2% paraffin and other necessary additives, the method for characterizing the hardness of the mixture RTP particles , including the following steps:

[0038] (1) Take 50 grams of cemented carbide mixture (that is, the mixture RTP containing 10.0um WC-12%Co-2% paraffin and other necessary additives);

[0039] (2) Use the national standard GB-T 6003 standard screen Φ200*50—0.09 / 0.063 to sieve to remove fine powder;

[0040] (3) Take 20 grams of sieved material, use a 15*20mm mold, and use a loading speed of 5mm / s, and a pressing force per unit area of ​​3Kg / cm 2 , the holding time is 5 seconds, and pressed into cubes; at this time, the powder particles in the cubes have very little binding force, and some powder particles with lower strength have been crushed;

[0041] (4) Then use a wool brush with a hair lengt...

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PUM

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Abstract

The invention discloses a method for characterizing mixture reinforced thermo plastics (RTP) particle hardness. The method includes that a way of low pressure compression and sieving is used, low pressure compression is used to damage a particle structure, a brush is used to disperse sampling blocks, a sieving way is used to judge a proportion that the particles is crushed, and therefore hardness of hard alloy mixture particles is characterized in ration, real-time monitor to the hardness of the particles in the mixture RTP particle manufacturing process can be achieved, and the production quality of products is guaranteed. The method has the advantages of being simple, easy to operate, good in reproducibility of data and the like. The hardness of the hard alloy mixture consisting of materials with different constituents or mixture ratios all can be characterized through the method.

Description

technical field [0001] The invention relates to the technical field of hard alloy material manufacture, in particular to a method for characterizing the hardness of RTP particles of a mixture. Background technique [0002] Compound RTP particles refer to the particles formed by the mixture of WC, Co, a small amount of forming agent and some other necessary additives through ball milling, dry granulation and other processes, which can be directly pressed into cemented carbide products. [0003] At present, the hardness of the particles is mainly characterized by the method of microhardness, but it is not suitable for the RTP particles of the mixture in powder metallurgy. The main reasons are: first, the RTP particles of the mixture are relatively small, and the average particle size is about 80-200um. To measure the microhardness, samples must be mounted, but it is difficult to mount samples with RTP particles of the mixture, because the particle structure is soft and agglome...

Claims

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Application Information

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IPC IPC(8): G01N3/40
Inventor 李玲艳吴冲浒郭新营文晓肖满斗谢海唯李文强郑建平
Owner XIAMEN TUNGSTEN
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