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Method for inhibiting cemented carbide grain growth and ultra-fine grain cemented carbide preparation process

A cemented carbide, grain growth technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problem of inhibiting uneven distribution, achieve grain refinement, reduce speed and probability, improve hardness and bending resistance the effect of strength

Active Publication Date: 2017-05-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uneven distribution of grain growth inhibition in the existing conventional technology, and propose a method for inhibiting cemented carbide grain growth with simple flow and easy operation

Method used

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  • Method for inhibiting cemented carbide grain growth and ultra-fine grain cemented carbide preparation process
  • Method for inhibiting cemented carbide grain growth and ultra-fine grain cemented carbide preparation process
  • Method for inhibiting cemented carbide grain growth and ultra-fine grain cemented carbide preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1: Co. 3 o 4 -V 2 o 5 Preparation of Composite Nanopowders

[0048] Take 100gCoCl 2 and 4.65gNH 4 VO 3 Preparation of CoCl with a concentration of 0.4mol / L 2 , NH 4 VO 3 Add 0.44mol / L, same volume, same temperature oxalic acid solution to the resulting mixed solution and mix evenly, stir to produce precipitate; after 6 hours of aging, dry the precipitate and calcinate at 400°C for 4h to prepare Co 3 o 4 -V 2 o 5 Composite nanopowder; V 2 o 5 :Co 3 o 4 =1:35.87.

[0049] The second step: preparation of Co-VC composite structure nanopowder

[0050] Weigh Co according to the designed cemented carbide material composition ratio 3 o 4 -V 2 o 5 Composite nanopowder, C, where Co 3 o 4 -V 2 o 5 Composite nanopowder: C=2.7:1, mixing and ball milling to obtain a powder mixture; mold the alloy powder mixture in a mold to form a compact, and the molding pressure is 80MPa; place the compact in a vacuum atmosphere In-situ carbonization reaction, the rea...

Embodiment 2

[0055] Step 1: Co. 3 o 4 -V 2 o 5 Preparation of Composite Nanopowders

[0056] Take 100g of CoCl 2 and 2.99 g of NH 4 VO 3 Preparation of CoCl with a concentration of 0.6mol / L 2 , NH 4 VO 3 Add 0.72 mol / L oxalic acid solution of the same volume and temperature to the resulting mixed solution and mix evenly, stirring to produce a precipitate; after 6 hours of aging, the precipitate is dried and calcined at 400°C for 2 hours to prepare Co 3 o 4 -V 2 o 5 Composite nanopowder; V 2 o 5 :Co 3 o 4 =1:50.

[0057] The second step: preparation of Co-VC composite structure nanopowder

[0058] Weigh Co according to the designed cemented carbide material composition ratio 3 o 4 -V 2 o 5 Composite nanopowder, C, where Co 3 o 4 -V 2 o 5 Composite nanopowder: C=2.8:1, mixing and ball milling to obtain a powder mixture; molding the alloy powder mixture in a mold to form a compact, and the molding pressure is 100MPa; placing the compact in a vacuum atmosphere In-situ...

Embodiment 3

[0063] Step 1: Co. 3 o 4 -V 2 o 5 Preparation of Composite Nanopowders

[0064] Take 100g of CoCl 2 and 6.14 g of NH 4 VO 3 Preparation of CoCl with a concentration of 0.8mol / L 2 , NH 4 VO 3 Add 0.9 mol / L, same volume, same temperature oxalic acid solution to the obtained mixed solution and mix evenly, stir to produce precipitate; after 4 hours of aging, dry the precipitate and calcinate at 450°C for 4h to prepare Co 3 o 4 -V 2 o 5Composite nanopowder; V 2 o 5 :Co 3 o 4 =1:28.40.

[0065] The second step: preparation of Co-VC composite structure nanopowder

[0066] Weigh Co according to the designed cemented carbide material composition ratio 3 o 4 -V 2 o 5 Composite nanopowder, C, where Co 3 o 4 -V 2 o 5 Composite nanopowder: C=2.9:1, mixing and ball milling to obtain a powder mixture; mold the alloy powder mixture in a mold to form a compact, and the molding pressure is 150MPa; place the compact in a vacuum atmosphere In-situ carbonization reaction,...

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Abstract

The invention provides a method for inhibiting cemented carbide grain growth and an ultra-fine grain cemented carbide preparation process. According to the method for inhibiting the cemented carbide grain growth, in the mixing step of the ultra-fine grain cemented carbide preparation procedure, Co-VC micro-nano composite powder is added into WC powder, and the mixture is mixed evenly and is subjected to blank pressing and sintering; and the Co-VC micro-nano composite powder is prepared from V2O5-Co3O4 composite nanopowder through a carbonization and reduction reaction, and the V2O5-Co3O4 composite nanopowder is prepared through a liquid phase chemical precipitation method. The ultra-fine grain cemented carbide preparation process comprises the steps of weighing the Co-VC micro-nano composite powder, mixing the Co-VC micro-nano composite powder with the WC powder, conducting mold pressing to manufacture blanks, and conducting pressure sintering. The method is simple and convenient. Uniform distribution of VC in binding phases in cemented carbide can be guaranteed. Abnormal growth of WC grains is effectively inhibited in the sintering procedure. The hardness, bending strength and other properties of ultra-fine grain cemented carbide prepared through the method are all superior to those of existing cemented carbide prepared in the mode that VC and other inhibitors are added through a mixing method. The ultra-fine grain cemented carbide has prospects of industrial mass production.

Description

technical field [0001] The invention discloses a method for inhibiting the growth of hard alloy crystal grains and a preparation process of ultrafine-grained hard alloy, belonging to the technical field of hard alloy material preparation. Background technique [0002] Cemented carbide is an indispensable tool material in the modern machining industry. It is composed of one or more high-hardness refractory metal hard compounds (WC, VC, etc.) Metal (Co, Ni, Fe) or its alloys are used as the binder phase, and the cermet composite material is prepared by powder metallurgy. Its hard phase mainly plays the role of high hardness and high wear resistance, while the binder phase is to provide the necessary toughness and strength of the alloy material, making the cemented carbide a material with high hardness, high wear resistance, high toughness and high strength. characteristic. WC-Co cemented carbide is the largest and most widely used cemented carbide, which is composed of high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F9/20
CPCC22C1/051C22C29/005C22C29/08B22F9/20B22F2998/10B22F1/10B22F3/14B22F3/02
Inventor 吝楠
Owner HUNAN UNIV
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