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Hard alloy material powder dispersing agent

A technology of cemented carbide and raw material powder, which is applied in the field of dispersant and can solve the problems of uneven microstructure of ultrafine cemented carbide.

Active Publication Date: 2009-03-18
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a compound dispersant for uniformly dispersing ultrafine cemented carbide raw material powder, and solve the problem of uneven structure of ultrafine cemented carbide caused by uneven distribution of raw material powder

Method used

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  • Hard alloy material powder dispersing agent
  • Hard alloy material powder dispersing agent
  • Hard alloy material powder dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: WC powder with a BET particle size of less than 0.4 and Co powder with a Fsss particle size of less than 2.0 are used in a mass ratio of 9:1 to prepare 1 kg of a mixture. Adopting alcohol as wet grinding medium, 2% molding agent PEG4000 (the following examples are all the same), in the mixed slurry, add 0.4g Tween 60, 0.2g stearic acid, 0.1g lauryl by every kilogram of mixed material Trimethylammonium bromide, respectively 0.04%, 0.02% and 0.01% of the powder mass. The above materials are wet-milled for more than 48 hours, and then dried, sieved, pressed and sintered at 1410°C under low pressure to make ultra-fine cemented carbide. figure 1 The SEM picture of the alloy made by adding the compound dispersant according to the above conditions; Figure 4 SEM pictures of the alloy made without dispersant. Table 1 lists the physical properties of alloys made without adding dispersant and alloys made by adding compound dispersant according to the above conditions...

Embodiment 2

[0011] Embodiment 2: Add 0.8g Tween 60, 0.3g stearic acid, 0.1g dodecyltrimethylammonium bromide by every kilogram of mixture in the mixed slurry, which are respectively 0.08% and 0.03% of the powder mass and 0.01%. The above materials are subjected to the same wet grinding, drying, sieving, pressing, and low-pressure sintering to make superfine hard alloy. figure 2 The SEM picture of the alloy made by adding the compound dispersant according to the above conditions. Table 1 lists the physical properties of the alloy prepared by adding the compound dispersant according to the above conditions.

Embodiment 3

[0012] Embodiment 3: Add 2.0g Tween 60, 1.0g stearic acid, 0.3g dodecyltrimethylammonium bromide by every kilogram of mixture in the mixed slurry, which are respectively 0.2% and 0.1% of the powder mass and 0.03%. The above materials are subjected to the same wet grinding, drying, sieving, pressing, and low-pressure sintering to make superfine hard alloy. image 3 The SEM picture of the alloy made by adding the compound dispersant according to the above conditions. Table 1 lists the physical properties of the alloy prepared by adding the compound dispersant according to the above conditions.

[0013] Table 1

[0014] make up

[0015] from Figure 1 ~ Figure 4 It can be seen from Table 1 that the alloy with compound dispersant added during the ball milling of the mixture has a more uniform structure and about 10% higher flexural strength.

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Abstract

The invention provides a compound dispersant for evenly dispersing ultra-fine cemented carbides powders, consisting of Tween 60, stearic acid and lauryl trimethyl ammonium bromide, which respectively account for 0.01 to 0.2percent, 0.01 to 0.1percent and 0.01 to 0.05percent of the powder weight. The invention solves the problem of uneven structure of ultra-fine cemented carbides caused by unevenly spread powder.

Description

technical field [0001] The invention relates to a dispersant for uniformly dispersing cemented carbide raw material powder, in particular to a composite dispersant for uniformly dispersing ultrafine cemented carbide raw material powder. Background technique [0002] When preparing ultra-fine cemented carbide mixture, the ball milling process is to make the ultra-fine WC powder, Co powder and grain growth inhibitor uniformly distributed. Due to the fine particle size of the multi-component powder, large specific surface area, high surface energy and high reactivity, the powder particles tend to agglomerate each other to reduce the surface energy. This kind of agglomerate is heterogeneous. In the initial stage of sintering densification, the powder will grow rapidly in the area of ​​high Co or poor grain growth inhibitor in the compact; as the densification proceeds , Discontinuous growth will control these areas, so coarse WC grains and Co pools, and other inhomogeneous orga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05
Inventor 周定良黄文亮谢文
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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