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Low-cobalt hard alloy resistant to high temperature, abrasion and corrosion and preparation method thereof

A hard alloy, wear-resistant technology, applied in the field of powder metallurgy, can solve the problems of cobalt hard alloy toughness and strength reduction, difficulty in alloy sintering and densification, and low Co content, so as to improve strength and wear resistance, inhibit Effect of grain growth and high temperature hardness improvement

Active Publication Date: 2016-12-07
HEYUAN ZHENGXIN HARDMETAL CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size of the WC powder of low-cobalt cemented carbide, large specific surface area, and low Co content, the amount of liquid phase generated during the sintering process is much smaller than that of conventional cemented carbide, and the WC particles are difficult to be completely wetted by the liquid phase, and the alloy is densely sintered It is difficult to sinter, and because of the small particle size and high activity of WC powder and Co powder, it is easy to have abnormal grain growth in the sintering process.
At the same time, due to the lack of binder phase, the toughness and strength of low-cobalt cemented carbide are reduced
[0005] Therefore, there is still a lack of a low-cobalt hard alloy with high temperature resistance, wear resistance and corrosion resistance in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation of embodiment 1 graphite boat

[0040] Clean the inner surface of the graphite boat with a brush, pour 35mL of special paint into the boat, quickly use a brush to evenly paint the paint on the inner surface of the graphite boat, dry at room temperature for 10 minutes, and then paint the graphite boat with the special paint The inner surface of the dish is washed twice, and dried at room temperature.

[0041] Wherein, the special coating is composed of the following components in terms of mass percentage: carbon black 18%, graphite 10%, Tween-808%, n-butanol 1%, polyethylene glycol-60003%, titanium dioxide 1% , formaldehyde 0.1%, gasoline 58.9%; Its preparation method comprises the steps: all raw materials are added in the rolling ball mill, and grinding ball is cemented carbide grinding ball, and the diameter of ball is Φ 5mm, Φ 8mm, Φ 12mm, and ball-to-material ratio is 1.3: 1. The rotation speed of the ball mill is 36r / min, and the ball milling time i...

Embodiment 2

[0042] Embodiment 2 Preparation of high-temperature-resistant, wear-resistant and corrosion-resistant low-cobalt cemented carbide

[0043] The low-cobalt cemented carbide with high temperature resistance, wear resistance and corrosion resistance of this embodiment is composed of the following ingredients in parts by mass: Co0.1 part, Cr 3 C 2 0.4 parts, 8.0 parts of TaC, 0.6 parts of NbC, 2.0 parts of TiC and 88.9 parts of WC, among which, WC uses ultra-fine grain WC powder with HCP value of 41.5KA / m.

[0044] Preparation:

[0045] S1: Take all the ingredients, mix them evenly, and then use alcohol as the ball milling medium for ball milling, the liquid-solid ratio is 530mL / kg, the ball-to-material ratio is 5:1, and the ball milling time is 108h;

[0046] S2: Vacuum-dry the mixed and ground ingredients in a sealed state, and after drying, sieve under the protection of inert gas Ar, add wax, and granulate to prepare a mixture;

[0047] S3: isostatic pressing to make a compa...

Embodiment 3

[0050] Embodiment 3 Preparation of high-temperature-resistant, wear-resistant and corrosion-resistant low-cobalt cemented carbide

[0051] The low-cobalt cemented carbide with high temperature resistance, wear resistance and corrosion resistance of this embodiment is composed of the following ingredients in parts by mass: 1.0 parts of Co, 1.0 parts of Cr 3 C 2 0.6 parts, 6.0 parts of TaC, 1.0 parts of NbC, 4.0 parts of TiC and 87.4 parts of WC, among which, WC uses ultra-fine grain WC powder with HCP value of 39.5KA / m.

[0052] Preparation:

[0053] S1: Take all the ingredients, mix them evenly, and then use alcohol as the ball milling medium for ball milling, the liquid-solid ratio is 530mL / kg, the ball-to-material ratio is 5:1, and the ball milling time is 108h;

[0054] S2: Vacuum-dry the mixed and ground ingredients in a sealed state, and after drying, sieve under the protection of inert gas Ar, add wax, and granulate to prepare a mixture;

[0055] S3: isostatic pressi...

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Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a low-cobalt hard alloy resistant to high temperature, abrasion and corrosion and a preparation method thereof. The low-cobalt hard alloy resistant to high temperature, abrasion and corrosion comprises the following ingredients in parts by mass: 0.1-1.0 part of Co, 0.4-0.6 part of Cr3C2, 6.0-8.0 parts of TaC, 0.6-1.0 part of NbC, 2.0-4.0 parts of TiC and 75-90 parts of WC. The low-cobalt hard alloy provided by the invention is relatively small in WC grain size and is uniform in distribution, and has an average grain size being 0.30-0.35 [mu]m; meanwhile, the low-cobalt alloy has hardness of HRA94.6-96.5, bending strength of 2300-2700N / mm<2>, has good high temperature resistance, good abrasion resistance and good corrosion resistance, can effectively prolong the service life of a tool, and can improve cutting efficiency of the tool.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a low-cobalt hard alloy with high temperature resistance, wear resistance and corrosion resistance and a preparation method thereof. Background technique [0002] WC-Co cemented carbide is used to manufacture cutting tools, knives, drilling tools and wear-resistant parts due to its high strength, hardness and high elastic modulus. It is widely used in military industry, aerospace, machining, metallurgy, petroleum Drilling, mining tools, electronic communications, construction and other fields. WC-Co cemented carbide is composed of a hard phase (mainly WC) and a binder phase (iron group elements Co, Fe, Ni, etc.). The binder phase promotes the full densification of the alloy sintering and improves the toughness and strength of the alloy. At the same time, it also leads to the reduction of high temperature resistance, wear resistance and corrosion resistance of cemented ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C09D1/00C09D7/12C09D7/00
CPCC09D1/00C22C1/051C22C29/08
Inventor 叶惠明叶少良诸优明
Owner HEYUAN ZHENGXIN HARDMETAL CARBIDE
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