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Method for preparing Ni-W alloy by vacuum sintering

A vacuum sintering and alloying technology, which is applied in the field of vacuum sintering to prepare Ni-W alloys, can solve the problems of high cost and low density of Ni-W alloys, and achieve the effects of easy implementation, low cost and simple process

Inactive Publication Date: 2012-01-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing Ni-W alloy by vacuum sintering, which solves the problems of high cost and low density of Ni-W alloy

Method used

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  • Method for preparing Ni-W alloy by vacuum sintering
  • Method for preparing Ni-W alloy by vacuum sintering
  • Method for preparing Ni-W alloy by vacuum sintering

Examples

Experimental program
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Effect test

Embodiment 1

[0037] According to the Ni-W alloy chemical composition mass percentage Ni: W=70%: 30%, take by weighing the Ni powder and the particle diameter of 40~50 μ m, purity not less than 99.9%, oxygen content being 800~1000ppm respectively. 6~10μm, purity not less than 99.9%, W powder with oxygen content of 500~800ppm; mix the weighed Ni powder and W powder and put them into the ball mill tank, in order to balance the cold welding and fracture of the powder in the ball mill , add 4% dehydrated alcohol of the total mass of mixed powder in the ball mill as a process control agent, select WC balls as grinding balls, select the ball-milling ratio as 15:1, and then seal the ball milling tank for ball milling; the ball milling time is 24 hours , the speed of the ball milling tank is 200r / min; the mixed powder of nickel powder and tungsten powder after ball milling is molded, the pressure is 80MPa, and the pressure is kept for 15s; then the pressed billet is placed in the vacuum sintering fu...

Embodiment 2

[0039] According to the ratio of Ni-W alloy chemical composition mass percentage Ni: W=75%: 25%, take the Ni powder and particle diameter of 40~50 μ m, purity not less than 99.9%, and oxygen content to be 800~1000ppm respectively in particle diameter: 6~10μm, purity not less than 99.9%, W powder with oxygen content of 500~800ppm; mix the weighed Ni powder and W powder and put them into the ball mill tank, in order to balance the cold welding and fracture of the powder in the ball mill In the ball mill, add 5% dehydrated alcohol of the total mass of the mixed powder as a process control agent, select WC balls as the grinding balls, select the ball-milling ratio as 20:1, and then seal the ball milling tank for ball milling; the ball milling time is 48 hours , the speed of the ball milling tank is 200r / min; the mixed powder of nickel powder and tungsten powder after ball milling is molded, the pressure is 60MPa, and the pressure is kept for 20s; then the pressed billet is placed i...

Embodiment 3

[0041] According to the ratio of Ni-W alloy chemical composition mass percentage Ni: W=80%: 20%, take by weighing the Ni powder and particle diameter of 40~50 μ m, purity not less than 99.9%, oxygen content being 800~1000ppm respectively. 6~10μm, purity not less than 99.9%, W powder with oxygen content of 500~800ppm; mix the weighed Ni powder and W powder and put them into the ball mill tank, in order to balance the cold welding and fracture of the powder in the ball mill , add 2% dehydrated alcohol of the total mass of mixed powder in the ball mill as a process control agent, select WC balls as grinding balls, select the ball-milling ratio as 10:1, and then seal the ball milling tank for ball milling; the ball milling time is 72 hours , the speed of the ball milling tank is 200r / min; the mixed powder of nickel powder and tungsten powder after ball milling is molded, the pressure is 70MPa, and the pressure is kept for 10s; then the pressed billet is placed in the vacuum sinteri...

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Abstract

The invention discloses a method for preparing Ni-W alloy by vacuum sintering, comprising the following steps of: using a Ni powder with its purity being no less than 99.9% and a W powder with its purity being no less than 99.9% as raw materials, carrying out ball milling on the two powders at different weight ratio at different time and at different ball milling ratio; compacting, carrying out vacuum sintering on the pressed compact, cooling in furnace, and finally machining the Ni-W alloy into a finished product. The method provided by the invention has simple preparation technology and requires low production cost. By the adoption of the method, nickel-tungsten alloy with high density and homogeneous microstructure can be prepared.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and in particular relates to a method for preparing Ni-W alloy by vacuum sintering. Background technique [0002] At present, only Cu and Ni are the materials that have been maturely applied in the field of micro-electromechanical systems, but these materials have low hardness, poor wear resistance, heat resistance and corrosion resistance. Ni has more excellent physical and chemical properties, and its hardness, wear resistance, and heat resistance are significantly improved compared with Ni thin films, and it has a good application prospect in micro-electromechanical systems. [0003] The sputtering method is a better method for preparing Ni-W alloy thin films. The advantage of this method is that the prepared thin films have high density and good stability. The preparation of Ni-W alloy targets with high density and uniform structure is the prerequisite for sputtering Ni...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/04
Inventor 梁淑华张晨邹军涛
Owner XIAN UNIV OF TECH
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