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Method of preparing nano-crystalline powdered alloy powder

A nickel-tungsten alloy and nanocrystalline technology, which is applied in the field of nickel-tungsten alloy powder preparation, can solve the problems of high cost of production equipment, limited small batches, harsh conditions, etc., and achieve the goal of increasing heat treatment speed, uniform tissue distribution, and reducing heat treatment temperature Effect

Inactive Publication Date: 2015-07-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Xiaoxian (Application and research status of electrodeposited nickel-tungsten alloy [J]. Shanghai Nonferrous Metals, 2010, 2:011.) Using nickel sulfate and sodium tungstate as raw materials to prepare tungsten-nickel alloy using simple equipment and coating The speed is fast, but this method is only suitable for preparing alloy coatings and the process is relatively complicated; the laser forming method can prepare parts with complex shapes without hard tools and molds, and the cycle is short, but it is limited to small batches and production equipment Disadvantages such as high cost; the preparation of nickel-tungsten alloy by traditional powder metallurgy mainly includes mechanical alloying and melting, etc. Chinese patent CN102329973A uses the method of vacuum induction melting to mechanically mix Ni powder and W powder and then mold them to cast alloy ingots
Although this method can fully mix NiW, it requires a vacuum and high temperature environment, and the conditions are relatively harsh.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh out nickel nitrate (Ni(NO 3 ) 2 )0.1mol, ammonium metatungstate ((NH 4 ) 6 H 2 W 12 O 40 )0.04mol, Glycine (C 2 H 5 NO 2 )0.2mol,. The raw material powder is dissolved in an appropriate amount of deionized water and stirred to complete dissolution and then heated at a constant temperature of 200°C. After the solution is evaporated to dryness, an oxidation-reduction reaction occurs to obtain the precursor tungsten oxide and nickel oxide mixed powder. The precursor is reduced in hydrogen at 600° C., kept for 2 hours and then cooled in the furnace to obtain alloy powder with a grain size of 80-120 nm.

Embodiment 2

[0020] Weigh out nickel nitrate (Ni(NO 3 ) 2 )0.1mol, ammonium metatungstate ((NH 4 ) 6 H 2 W 12 O 40 )0.008mol, glycine (C 2 H 5 NO 2 ) 0.2mol. The raw material powder is dissolved in an appropriate amount of deionized water and stirred until it is completely dissolved and then heated in a muffle furnace at a constant temperature of 200° C. After the solution is evaporated to dryness, a reaction occurs to obtain a mixed powder of precursor tungsten oxide and nickel oxide. The precursor is reduced in hydrogen at 600° C., kept for 2 hours and then cooled in the furnace to obtain alloy powder with a grain size of 50-100 nm.

Embodiment 3

[0022] Weigh out nickel nitrate (Ni(NO 3 ) 2 )0.1mol, ammonium metatungstate ((NH 4 ) 6 H 2 W 12 O 40 )0.01mol, Glycine (C 2 H 5 NO 2 ) 0.4mol. The raw material powder is dissolved in an appropriate amount of deionized water and stirred until it is completely dissolved and then heated in a muffle furnace at a constant temperature of 200° C. After the solution is evaporated to dryness, a reaction occurs to obtain a mixed powder of precursor tungsten oxide and nickel oxide. The precursor is reduced in hydrogen at 650°C, kept for 2 hours and then cooled in the furnace to obtain alloy powder with a grain size of 30-100 nm.

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Abstract

The invention provides a method of preparing nano-crystalline powdered alloy powder, and belongs to the field of a powder metallurgy preparation technology. The method comprises the steps: preparing an oxide precursor by adopting a solution method; carrying out reductive sintering on the precursor powder in hydrogen; and obtaining pure nickel-tungsten alloy powder with fine crystal particles. According to the method provided by the invention, all raw materials are mixed by using a liquid phase, reactants can be uniformly mixed on an atom level, and the problem that the alloy powder is difficult to mix can be solved; meanwhile, the method has the characteristics of low cost and high use ratio of raw material powder; in addition, because the nano-crystalline powdered alloy powder is plied as nano-crystalline powder, and the method is higher in rigidity, wearability, corrosion resistance, resistance to high temperature oxidation and the like.

Description

Technical field [0001] The invention belongs to the technical field of advanced powder metallurgy preparation, and particularly provides a method for preparing nickel-tungsten alloy powder. Background technique [0002] As a traditional material, nickel-tungsten alloy has attracted much attention because of its various superior properties and some potential application values. The tungsten-nickel alloy electroplating layer has a compact structure and high heat resistance, which is comparable to ceramics; it is resistant to wear and oxidation at high temperatures, and has good self-lubrication and corrosion resistance. The properties of alloys with different nickel-tungsten ratios have significant differences. When the content of tungsten is higher than 43-44%, the alloy exhibits an amorphous structure and has excellent corrosion resistance, wear resistance, and radiation protection. When the tungsten content is less than 10%, the alloys are mainly used as base tapes. The prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 秦明礼陈鹏起陈铮刘烨李睿吴昊阳贾宝瑞曹知琴丁向莹
Owner UNIV OF SCI & TECH BEIJING
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