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Method for preparing high-strength WC-Ni hard alloys

A cemented carbide and high-strength technology, which is applied in the field of preparing high-strength WC-Ni cemented carbide, can solve the problems of limiting the application range of WC-Ni cemented carbide and the gap in mechanical properties, and achieve low thermal expansion coefficient and good wear resistance sexual effect

Inactive Publication Date: 2017-09-22
重庆强锐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a big gap between the mechanical properties of WC-Ni cemented carbide and WC-Co cemented carbide, and its fracture strength can only reach 75% to 80% of WC-Co cemented carbide, which greatly limits the performance of WC-Co cemented carbide. -Application range of Ni cemented carbide

Method used

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  • Method for preparing high-strength WC-Ni hard alloys
  • Method for preparing high-strength WC-Ni hard alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0015] The preparation method of embodiment 1 WC-Ni cemented carbide

[0016] 1) First, accurately weigh WC, Ni, and SiC whisker (90:8:2) raw material powders according to a certain ratio. Mix evenly in the ball mill barrel, then add ethanol medium, the ball mill barrel is filled with YG8 hard alloy balls with a diameter of 10mm, the speed of the balls is 100r / min, and the raw material powder is wet milled in the ball mill barrel for 12 hours. and homogenization, to obtain a mixture with uniform distribution of binder phase and hard phase, and to make the grain size meet the requirements;

[0017] 2) Dry the wet-milled mixed material in a vacuum drying oven for 12 hours, and the vacuum degree is higher than 10 -3 Pa, drying temperature 80-100 ℃.

[0018] 3) Pressing the dried mixture into a graphite mould, and controlling the pressure range to 55-60 MPa.

[0019] 4) Protect the blank obtained in the previous step with high-purity nitrogen, place it in a vacuum sintering fur...

Embodiment 2

[0020] The preparation method of embodiment 2 WC-Ni cemented carbide

[0021] 1) First, accurately weigh WC, Ni, Al2O3 whisker (90:8:2) raw material powder according to a certain proportion. Add it into the ball mill barrel and mix evenly, then add ethanol medium, the ball mill barrel is filled with YG8 cemented carbide balls with a diameter of 10mm, the speed of the ball is 50r / min, and the raw material powder is wet milled in the ball mill barrel for 24 hours. Homogenization and homogenization to obtain a mixture with uniform distribution of binder phase and hard phase, and make the grain size meet the requirements;

[0022] 2) Dry the wet-milled and uniformly mixed material in a vacuum drying oven with a vacuum degree higher than 10-3Pa and a drying temperature of 80-100°C.

[0023] 3) Pressing the dried mixture into a graphite mould, and controlling the pressure range to 45-55 MPa.

[0024] 4) Protect the billet obtained in the previous step with high-purity nitrogen, pl...

Embodiment 3

[0025] The preparation method of embodiment 3 WC-Ni cemented carbide

[0026] 1) First, accurately weigh WC, Ni, Si according to a certain ratio 3 N 4 Whiskers (WC: Ni: Si 3 N 4＝ 90:8:2) Raw material powder, whisker powder diameter range 0.1-10μm, whisker length range 5-150μm, put into the ball mill barrel and mix evenly, then add ethanol medium, the ball mill barrel is filled with YG8 hard powder with a diameter of 10mm high-quality alloy balls, the speed of the balls is 300r / min, wet ball milling is used for 6 hours, the raw material powder is wet-milled and homogenized in the ball mill barrel, and the mixture with uniform distribution of the binder phase and the hard phase is obtained, and Make the grain size meet the requirements;

[0027] 2) Dry the wet-milled mixed material in a vacuum drying oven with a vacuum degree higher than 10 -3 Pa, drying temperature 80-100 ℃.

[0028] 3) Pressing the dried mixture into a graphite mould, and controlling the pressure range t...

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Abstract

The invention discloses a method for preparing high-strength WC-Ni hard alloys. The method comprises the following steps: uniformly mixing WC, Ni and crystal whiskers; carrying out ball wet milling and refining; carrying out dry and wet milling on a mixed material; doping a molding agent; uniformly mixing; drying and removing solvent; granulating; then compacting into blanks; putting in a vacuum sintering furnace to be continuously sintered for 0.8 to 1.5h; and then cooling to obtain the WC-Ni hard alloys. According to the alloys prepared by adopting the method, the mechanical performance is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of hard alloy materials and manufacture, and in particular relates to a method for preparing high-strength WC-Ni hard alloy. Background technique [0002] Cemented carbide materials with WC, TiC, and TaC as the main hard components and Co as the main binder phase have been used as the most important materials for cutting tools and wear-resistant parts since they were invented in 1922. They are known as "industrial the teeth of". But later it was found that WC-Co cemented carbide has the disadvantages of toxicity, high cost and poor corrosion resistance. Therefore, it has become an important development direction in the field of cemented carbide to replace cobalt powder with new metal powder with low toxicity, relatively wide sources and good corrosion resistance. [0003] Studies have found that the toxicity of WC-Ni mixed powder is much lower than that of WC-Co mixed powder, and the content of nickel in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/00
CPCC22C1/051C22C29/005
Inventor 杨毓杰王林志
Owner 重庆强锐科技有限公司
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