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Method for preparing high-strength and high-hardness nano hard alloy

A cemented carbide, high hardness technology, used in metal processing equipment, transportation and packaging, etc., can solve the problems of uneven compounding, complex process, grain growth, etc., and achieve good monodispersity, product purity, and composition ratio. adjustable effects

Pending Publication Date: 2022-07-12
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

Obviously, these methods also have disadvantages such as high cost, complicated process, uneven compounding, etc., and repeated heating is prone to problems such as grain growth.

Method used

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  • Method for preparing high-strength and high-hardness nano hard alloy
  • Method for preparing high-strength and high-hardness nano hard alloy
  • Method for preparing high-strength and high-hardness nano hard alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, the method for preparing high-strength, high-hardness nano-hard alloy:

[0034] First, accurately weigh W, Co, V (86%: 8%: 6%) raw material powders according to a certain mass ratio. The diameter of the W powder particles is 50-200 nm, and the diameter of the Co powder particles is 200-400 nm. The diameter of the V powder particles ranges from 100 to 500 nm.

[0035] Vacuum to make the vacuum degree higher than 10 -3 Pa, then feed methane gas, control the flow rate of methane gas to be 6L / min, control the reduction carbonization reaction temperature to be 950°C, and the reaction time to be 6 hours. Thereby, a carbon-coated core / shell structure nanocomposite in which WC, Co, and VC are uniformly mixed in proportion is prepared.

[0036] The WC-Co-VC nanocomposite powder was pressed into a blank in a graphite mold, and the pressure range was controlled to 45MPa.

[0037] The blank obtained in the previous step is protected with high-purity iner...

Embodiment 2

[0039] like figure 1 As shown, the method for preparing high-strength, high-hardness nano-hard alloy:

[0040] First, accurately weigh W, Co, V (88%: 7%: 5%) raw material powder according to a certain mass ratio, the diameter of W powder particles is 200-400nm, and the diameter of Co powder particles is 400-500nm, The diameter of the V powder particles ranges from 500 to 800 nm.

[0041] Vacuum to make the vacuum degree higher than 10 -3Pa, then feed methane gas, control the flow rate of acetylene gas to be 8L / min, control the reduction carbonization reaction temperature to be 1000°C, and the reaction time to be 5 hours. Thereby, a carbon-coated core / shell structure nanocomposite in which WC, Co, and VC are uniformly mixed in proportion is prepared.

[0042] The WC-Co-VC nanocomposite powder was pressed into a blank in a graphite mold, and the pressure range was controlled to 35MPa.

[0043] The blank obtained in the previous step is protected by high-purity inert gas (arg...

Embodiment 3

[0045] like figure 1 As shown, the method for preparing high-strength, high-hardness nano-hard alloy:

[0046] First, accurately weigh W, Co, V (90%: 6%: 4%) raw material powders according to a certain mass ratio. The diameter of the W powder particles is 400-500 nm, and the diameter of the Co powder particles is 500-600 nm. The diameter of the V powder particles ranges from 800 to 1000 nm.

[0047] Vacuum to make the vacuum degree higher than 10 -3 Pa, then feed methane gas, control the flow rate of ethylene gas to be 10L / min, control the reduction carbonization reaction temperature to be 1050°C, and the reaction time to be 4 hours. Thereby, a carbon-coated core / shell structure nanocomposite in which WC, Co, and VC are uniformly mixed in proportion is prepared.

[0048] The WC-Co-VC nanocomposite powder was pressed into a blank in a graphite mold, and the pressure range was controlled to 50MPa.

[0049] The blank obtained in the previous step is protected with high-purity...

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Abstract

The invention belongs to the technical field of hard alloy materials and manufacturing, and particularly relates to a method for preparing high-strength and high-hardness nano hard alloy. According to the technical scheme, the method for preparing the high-strength and high-hardness nano hard alloy comprises the following steps that raw material powder of W, Co and V is evenly mixed according to the mass percent of 85%-90%: 6%-8%: 2%-9%; vacuumizing the mixed powder; then introducing a carbon source gas, and controlling the temperature of the reduction carbonization reaction to be 850-1050 DEG C and the reaction time to be 4-6 hours, so as to prepare a carbon-coated core / shell structure nano composite material in which WC, Co and VC are uniformly mixed in proportion; the WC-Co-VC nano composite powder is pressed into a blank in a graphite mold; and S4, continuously sintering the blank obtained in the step S4 in a vacuum sintering furnace under the protection of high-purity inert gas, and then cooling along with the furnace to obtain a hard alloy product. The invention provides a method for preparing a high-strength and high-hardness nano hard alloy.

Description

technical field [0001] The invention belongs to the technical field of hard alloy materials and manufacturing, and particularly relates to a method for preparing high-strength and high-hardness nano-hard alloys. Background technique [0002] With the rapid development of emerging industries such as light alloys, microelectronics and information technology, the demand for high-performance, high-precision and high-value-added carbide products is growing. Existing patents and research results show that refining WC grains is beneficial to improve the mechanical properties of WC-Co-based cemented carbides. When the WC grain size is reduced to less than 1 μm, the hardness and strength of the cemented carbide increase at the same time, and the increase is more obvious with the further reduction of the grain size. In order to develop cemented carbide with higher hardness and strength, and to solve the contradiction between the strength and hardness of traditional cemented carbide, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F1/00B22F1/14B22F3/10
CPCC22C29/08C22C1/056B22F3/1007
Inventor 欧阳兴宇
Owner 重庆强锐科技有限公司
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