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Carbon control technology for improving application effect of rare earth oxides in hard alloys

A technology of rare earth oxide and control technology, applied in the field of carbon control, to achieve the effect of improving comprehensive performance, good effect and strong versatility

Active Publication Date: 2012-12-26
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application effect of rare earth oxides in cemented carbide is not stable, which seriously affects the industrialization process of rare earth cemented carbide.

Method used

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  • Carbon control technology for improving application effect of rare earth oxides in hard alloys
  • Carbon control technology for improving application effect of rare earth oxides in hard alloys
  • Carbon control technology for improving application effect of rare earth oxides in hard alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Calculation of carbon allocation

[0031] Calculation of carbon content is carried out for the cemented carbide with the composition of "916 grams of WC powder (particle size 3-5 μm) + 80 grams of Co powder + 4 grams of cerium oxide powder". The actual carbon content of the selected WC powder is 6.00%, and the target carbon content was determined to be 6.13% through a large number of experiments in the early stage, so C WC It is (6.13%-6.00%)×916 grams=1.19 grams. C ReO According to the chemical formula of "cerium oxide + carbon → cerium + carbon monoxide", the calculation result is C ReO =0.56g, and the A value is determined to be 1 through experiments, then the total carbon content should be C t = C WC +A × C ReO = 1.75 grams.

[0032] In order to illustrate the change of carbon content after adding cerium oxide in this embodiment, the amount of carbon black added in component 1 is C WC = 1.19 g (not considering the amount of carbon consumed by ceriu...

Embodiment 2

[0043] (1) Calculation of carbon allocation

[0044] The actual carbon content of WC powder is 6.00%, and the target carbon content was determined to be 6.13% through a large number of experiments in the early stage. C WC It is (6.13%-6.00%)×920g=1.20g, in ingredients 2 and 3 C WC It is (6.13%-6.00%)×917 grams=1.19 grams. C ReO According to the chemical formula of "yttrium oxide + carbon → yttrium + carbon monoxide", in component 1 C ReO =0.00 g, in ingredients 2 and 3 C ReO =0.48 grams, the A value is determined to be 1.1 through experiments.

[0045] Then the total carbon content in component 1 C t = C WC +A× C ReO =1.20g+1.1×0.00g=1.20g;

[0046] Total carbon content in ingredients 2 and 3 C t = C WC +A× C ReO =1.19g+1.1×0.48g=1.72g;

[0047] The amount of carbon black added in the present embodiment component 1 is Ct =1.20 g, the amount of carbon black added in component 2 is C t =1.72 g, the amount of carbon black added in component 3 is C t = 1...

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Abstract

The invention relates to a carbon control technology for improving the application effect of rare earth oxides in hard alloys. The carbon control technology comprises the following steps of: (1) calculating carbon blending amount: calculating the carbon blending amount according to a formula, wherein Ct is the total carbon blending amount, CWC is a difference between the actual carbon content in tungsten carbide and target carbon content, CReO is the amount of carbon consumed in the process of preparing the hard alloys by means of the rare earth oxides, A is a constant between 0.8 and 1.2; and (2) controlling the vacuum degree in a vacuum sintering furnace not higher than 8 Pa before a liquid phase appears or when the temperature is between 1,000 and 1,200 DEG C in the sintering process. According to the carbon control technology, the carbon control is completed in the steps of blending and sintering, and the conventional process and equipment for manufacturing the hard alloys are not changed basically; the universality of the carbon control technology is high; the effect of the carbon control technology is good; the problem of decarburization in the process that the rare earth oxides are applied to the hard alloys is solved; and the comprehensive performance of rare earth hard alloy products is obviously improved. The carbon control technology is suitable for the preparation and the performance optimization of the rare earth hard alloys.

Description

[0001] technical field [0002] The invention relates to a carbon control technology for improving the application effect of rare earth oxides in cemented carbide, and belongs to the technical field of powder metallurgy. Background technique [0003] WC-Co cemented carbide has excellent properties such as extremely high hardness and wear resistance, high compressive strength, and good chemical stability. As an efficient tool material and structural material, the application fields of cemented carbide have been continuously expanded in recent years, which has played an extremely important role in promoting my country's industrial development and technological progress. However, compared with cemented carbide products in developed countries, my country's cemented carbide products still have the weakness of insufficient strength and toughness, and there is a certain gap in service performance and effective life. [0004] The enrichment of impurity elements at the phase int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 杨艳玲吴爱华陆德平陈进耿陈志宝尹桦刘秋香邹晋
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI