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Preparation method of chromium-doped hard alloy

A cemented carbide and chromium-doped technology, which is applied in the field of preparation of chromium-doped cemented carbide, can solve problems such as poor toughness and corrosion resistance, and achieve the goals of improving toughness and wear resistance, shortening sintering time, and increasing reaction speed Effect

Active Publication Date: 2019-01-04
湖北绿钨资源循环有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the main purpose of the present invention is to provide a method for preparing chromium-doped cemented carbide, which solves the problems of poor toughness and corrosion resistance of cemented carbide in the prior art

Method used

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preparation example Construction

[0032] A kind of preparation method of chromium-doped cemented carbide provided by the invention, this method realizes by following steps:

[0033] Step 1. Proportioning according to the following components by weight percentage: molybdenum powder 5.5-6.5%, nickel powder 4-6%, conventional tungsten carbide powder 46-68%, inhibitor 0.6-1.0%, chromium-doped cobalt powder 5-7%, the rest is cast tungsten carbide powder;

[0034] Among them, the inhibitor is Cr 3 C 2 、Cr 3 C 2 and VC or Cr 3 C 2 and TaC, and the dosage is less than 3% of the Cr-doped cobalt powder.

[0035] Step 2. First mix the conventional tungsten carbide powder and the cast tungsten carbide powder and perform ball milling until the particle size is 0.3-0.8um to obtain the mixed tungsten carbide powder after ball milling for later use; the inhibitor and the cobalt powder doped with chromium (Cr) Mixing and ball milling until the particle size is 0.2-0.6um, the chromium-doped cobalt powder obtained after b...

Embodiment 1

[0059] Step 1. Proportioning is carried out according to the following components by weight percentage: molybdenum powder 5.5%, nickel powder 4%, conventional tungsten carbide powder 46%, Cr 3 C 2 0.6%, 5% cobalt powder doped with Cr, and the rest is cast tungsten carbide powder;

[0060] Step 2: First, ball mill conventional tungsten carbide powder and cast tungsten carbide powder to a particle size of 0.3um to obtain mixed tungsten carbide powder after ball milling for later use; mix the inhibitor and cobalt powder doped with chromium (Cr) for ball milling Be 0.2um to particle diameter, obtain the cobalt powder doped with chromium (Cr) after ball milling, for subsequent use;

[0061] Step 3, mixing the ball-milled mixed tungsten carbide powder and the ball-milled chromium-doped cobalt powder and adding them into a ball mill for wet grinding to obtain the first mixed slurry;

[0062] Step 4. After mixing the remaining components, add them to a ball mill for wet grinding unt...

Embodiment 2

[0077] Step 1. Proportioning is carried out according to the following components by weight percentage: molybdenum powder 6%, nickel powder 5%, conventional tungsten carbide powder 50%, Cr 3 C 2 0.8%, 6% cobalt powder doped with Cr, and the rest is cast tungsten carbide powder;

[0078] Step 2: first ball mill conventional tungsten carbide powder and cast tungsten carbide powder to a particle size of 0.5um, and obtain mixed tungsten carbide powder after ball milling for later use; mix inhibitor and Cr-doped cobalt powder for ball milling to particle size Be 0.4um, obtain the cobalt powder doped with chromium after ball milling, for subsequent use;

[0079] Step 3, mixing the ball-milled mixed tungsten carbide powder and the ball-milled chromium-doped cobalt powder and adding them into a ball mill for wet grinding to obtain the first mixed slurry;

[0080] Step 4: After mixing the remaining components, add them to a ball mill for wet grinding until the particle size is 1.5um ...

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Abstract

The invention discloses a preparation method of chromium-doped hard alloy, which comprises the following steps: 1) weighing the following components: molybdenum powder, nickel powder, conventional tungsten carbide powder, inhibitor, cobalt powder doped with chromium, and the balance cast tungsten carbide powder; 2) mixing the conventional tungsten carbide powder and cast tungsten carbide powder and carrying out ball milling; mixing the inhibitor and the cobalt powder doped with chromium and carrying out ball milling; 3) mixing the milled mixed tungsten carbide powder and milled mixed cobalt powder doped with chromium and carrying out wet milling to obtain a first mixed slurry; 4) mixing the rest components and carrying out wet milling to obtain a second mixed slurry; 5) uniformly mixing the wet milled slurry to obtain a mixed material for the hard alloy; 6) carrying out filtering and drying treatment on the mixed material of the hard alloy and spraying to prepare granules, and then pressing and forming to prepare a compact; 7) sintering the compact, and preserving heat to obtain the chromium-doped hard alloy. By using the cobalt powder doped with chromium, the toughness and corrosion resistance of the alloy can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of hard alloy materials, in particular to a preparation method of chromium-doped hard alloy. Background technique [0002] Cemented carbide has the characteristics of high strength, high hardness, excellent wear resistance, heat resistance and good corrosion resistance, and is widely used to make wear-resistant parts, cutting tools, molds, mining tools, geological drilling tools , oil exploration tools, structural parts, high temperature and high pressure resistant cylinders and mechanical seal parts, etc. In the petroleum, chemical, mining, water conservancy and metal cutting industries, mechanical parts usually work in a corrosive environment. Corroded mechanical parts will accelerate wear and lead to premature failure of the parts. Carbide parts used in this environment are currently The problems of poor toughness, poor corrosion resistance, poor density, poor tensile strength and poor plasticity general...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08
CPCC22C1/056C22C29/067C22C29/08
Inventor 许开华郭苗苗吴伟陈元骁
Owner 湖北绿钨资源循环有限公司
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