Preparation method of mining hard alloy of ultra-thick mixcrystal structure

A technology of cemented carbide and crystal structure, which is applied in the field of preparation of cemented carbide raw material powder, can solve the problems of reducing the thermal fatigue resistance of the alloy, uneven distribution of the bonding phase, and low toughness of the cemented carbide, so as to improve the thermal fatigue. performance, retention of hardness and wear resistance, effect of improving toughness

Active Publication Date: 2017-04-26
重庆莱斯五金制造有限公司 +1
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  • Abstract
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  • Claims
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Problems solved by technology

The toughness of cemented carbide prepared by this process is still low. The main reasons are: 1. The current WC grain size is generally 4-8 microns, and the grain size is small, so it is difficult to provide high toughness; 2. The grain structure is single and the binder phase is distributed. Inhomogeneous, reducing the thermal fatigue resistance of the alloy

Method used

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  • Preparation method of mining hard alloy of ultra-thick mixcrystal structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of ultra-coarse mixed crystal structure mining cemented carbide, prepared according to the following steps:

[0024] (1) Dissolve 25.8 g of cobalt oxalate in absolute ethanol, and the mass ratio of cobalt oxalate to absolute ethanol is 1:1.

[0025] (2) Heat the above solution to 60°C while stirring, according to hydrazine: Co 2+ Add hydrazine at a molar ratio of 1:2, then add ammonia to keep the pH value of the solution at 8.5, then add the activator cetyltrimethylammonium bromide, the mass of cetyltrimethylammonium bromide in the solution The percentage is 5%.

[0026] (3) Add WC to the solution in step 2. The weight ratio of WC to cobalt in step 2 is 85:15. According to the weight percentage, WC is composed of 65% 20-26 μm WC, 35% 3-4 μm WC, and the total carbon is 6.14 .

[0027] (4) The mixed solution obtained in step (3) is ultrasonically oscillated, and the temperature of the mixed solution is kept at 60-70°C, and then the mixed solution i...

Embodiment 2

[0033] A preparation method of ultra-coarse mixed crystal structure mining cemented carbide, prepared according to the following steps:

[0034] (1) Dissolve 32.3 g of cobalt oxalate in absolute ethanol, and the mass ratio of cobalt oxalate to absolute ethanol is 2.5:1.

[0035] (2) Heat the above solution to 40°C while stirring, according to hydrazine: Co 2+ Add hydrazine at a molar ratio of 1: 1.5, then add ammonia to keep the pH value of the solution at 12, then add the activator cetyltrimethylammonium bromide, the mass of cetyltrimethylammonium bromide in the solution The percentage is 8%.

[0036] (3) Add WC to the solution in step 2. The weight ratio of WC to cobalt in step 2 is 90:10. WC consists of 65g of 20-26μmWC and 25g of 3-4μmWC, with a total carbon of 6.14.

[0037] (4) ultrasonically oscillate the mixed solution obtained in step (3), and keep the temperature of the mixed solution at 60-70° C., place the above solution in an inert gas environment for reaction, ...

Embodiment 3

[0043] A preparation method of ultra-coarse mixed crystal structure mining cemented carbide, prepared according to the following steps:

[0044] (1) Dissolve 32.5 g of cobalt oxalate in absolute ethanol, and the mass ratio of cobalt oxalate to absolute ethanol is 5:1.

[0045] (2) Heat the above solution to 50°C while stirring, according to hydrazine: Co 2+ Add hydrazine at a molar ratio of 1: 2.5, then add ammonia to keep the pH value of the solution at 8.5, then add the activator cetyltrimethylammonium bromide, the mass of cetyltrimethylammonium bromide in the solution The percentage is 5%.

[0046] (3) Add WC to the solution in step 2. The weight ratio of WC to cobalt in step 2 is 94:6. According to the weight, WC consists of 60% 20-26μmWC, 40% 3-4μmWC, and the total carbon is 6.17 .

[0047](4) ultrasonically oscillate the mixed solution obtained in step (3), and keep the temperature of the mixed solution at 60-70° C., place the above solution in an inert gas environmen...

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Abstract

The invention discloses a preparation method of a mining hard alloy of an ultra-thick mixcrystal structure. The preparation method comprises the following steps that cobalt oxalate is dissolved in absolute ethyl alcohol; a solution is heated till the temperature ranges from 40 DEG C to 60 DEG C, hydrazine is added, then ammonium hydroxide is added to keep the pH value of the solution between 8.5 and 12, and then activator cetyl trimethyl ammonium bromide is added; WC is added into the solution in the second step, the weight ratio of the WC to cobalt in the second step is (85-94):(6-15), and the WC is composed of 60%-80% of WC of 20-26 micrometers and 20%-40% of WC of 3-4 micrometers; an obtained mixed solution is subjected to sonic oscillation, the temperature of the mixed solution is kept between 60 DEG C and 70 DEG C, and the mixed solution is placed in an inert gas environment to react; a reaction solution is poured into a beaker while waste heat exists, sedimentation powder is collected, washing and vacuum airing are carried out, and composite powder is obtained; and paraffin and gasoline are added into the obtained composite powder, blow-drying is carried out at the normal temperature, and then sieving, granulating and press sintering are carried out to obtain a product. The thermal fatigue resistance of the alloy is improved.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide for mining with an ultra-coarse mixed crystal structure, belonging to the field of preparation of cemented carbide raw material powder. Background technique [0002] In the field of use of cemented carbide, mining cemented carbide is a very important part. The working environment of cemented carbide for mining is harsh. In addition to bearing compression, bending and high-profit abrasive wear, it also bears various uncertain impact forces. Therefore, the cemented carbide head often breaks and falls off during use, making the The life of the product is much lower than the design life. Therefore, an excellent mining cemented carbide should have the high hardness required to resist abrasive wear and the high toughness required to resist impact fracture. Almost all cemented carbides for ores in the world use coarse-grained WC cemented carbides. The preparation method is similar to the conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05
CPCC22C1/051
Inventor 姜爱民蒋林
Owner 重庆莱斯五金制造有限公司
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