Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder

A technology of cemented carbide and mixed powder, which is applied in the field of cemented carbide and powder metallurgy, can solve the problems of reducing the overall performance of bulk cemented carbide, the difficulty of uniform mixing of primary powder and recycled powder, and the unfavorable industrial application of recycled materials, etc., to achieve Excellent bending strength, easy to break, and eliminate the effect of segregation

Active Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The serious disadvantage of this method is that it is difficult to mix the primary powder and the regenerated powder evenly, and the aggregation of the regenerated WC powder will obviously reduce the overall performance of the prepared block cemented carbide. More importantly, this method seriously affects the stability of the product. Conducive to the industrial application of recycled materials

Method used

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  • Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder
  • Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder
  • Method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder

Examples

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example 1

[0045] Example 1: The final product is WC-8wt.%Co (n=8) mixed powder with a recycled powder content of 10% (m=10) and the cemented carbide block material obtained by sintering this as a raw material. According to the requirements of the regenerated powder content and the Co content in the final WC-8wt.%Co mixed powder, according to the condition of n=p=8, according to the regenerated oxide mixture (WO 3 +CoWO 4 ), native WO 2.9 , native Co 3 o 4 The mass ratio of carbon black and carbon black is 1:8.1:0.8:2.0 for batching and ball milling; after ball milling, the powder is dried, and the final WC-Co mixed powder is prepared by reduction carbonization reaction in a vacuum furnace. The specific process parameters are: the gas pressure is less than 0.01Pa, the heating rate is 10°C / min, the reaction temperature is 1100°C, and the temperature is kept for 2 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (b), its scanning electron micrograph ...

example 2

[0048] Example 2: The final product is WC-6wt.%Co (n=6) mixed powder with a recycled powder content of m%=40%, and it is used as a raw material to sinter to obtain a cemented carbide block material. According to the requirements of the regenerated powder content and the Co content in the WC-6wt.%Co powder and the condition of n3 +CoWO 4 ), native WO 2.9 , native Co 2 o 3 The mass ratio of carbon black and carbon black is 1:2.3:0.14:0.50 for batching and ball milling; after ball milling, the powder is dried, and the final WC-6wt.%Co mixed powder is prepared by reduction carbonization reaction in a vacuum furnace. The specific process parameters are: the gas pressure is less than 0.01Pa, the heating rate is 20°C / min, the reaction temperature is 1080°C, and the heat preservation is 1.5 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (c), whose scanning electron micrograph is shown in figure 2 (b), 5 parts were randomly taken from the fina...

example 3

[0050] Example 3: The final product is WC-16wt.%Co (n=16) mixed powder with recycled powder content of 20% (m=20). According to the requirements of the regenerated powder content and the Co content in WC-16wt.%Co powder, according to the condition of n>p=8, according to the regenerated oxide mixture (WO 3 +CoWO 4 ), native WO 3 , native Co 3 o 4 The mass ratio of carbon black and carbon black is 1:3.4:0.8:0.9 for batching and ball milling; after ball milling, the powder is dried, and the reduction carbonization reaction is carried out in a vacuum furnace to prepare the final WC-16wt.%Co mixture containing 20% ​​recycled powder pink. The specific process parameters are: the gas pressure in the furnace is less than 0.01Pa, the heating rate is 15°C / min, the reaction temperature is 1200°C, and the heat preservation is 3 hours. The XRD pattern of the prepared final WC-Co mixed powder is shown in figure 1 (d), its scanning electron micrograph is shown in figure 2 (c), 5 parts...

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Abstract

The invention relates to a method for synthesizing and preparing hard alloy powder by mixing original powder and regenerated powder and belongs to the technical field of the hard alloy and powder metallurgy. The method comprises the following steps of: oxidizing WC-Co waste hard alloys with different Co content to form a regenerated WC-Co oxide mixture; measuring the WO3 content in the regenerated WC-Co oxide mixture; according to the requirements of the Co content and the regenerated powder content in final state WC-Co mixed powder, adding native tungsten oxide, native cobalt oxide and carbon black required for implementing the requirement on the components of a final product into the regenerated WC-Co oxide mixture; carrying out ball mill mixing; and then performing the in-situ reduction and carburization reaction in the vacuum environment to obtain the hard alloy powder. According to the product obtained by the method disclosed by the invention, the native materials and the regenerated materials are totally and uniformly mixed, so that the stability of the product quality is improved and the components are accurate and controllable.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide and powder metallurgy, and in particular relates to a method for synthesizing and preparing WC-Co powder mixed with virgin powder and regenerated powder. Background technique [0002] Cemented carbide is known as the "teeth" of modern industry, with an annual usage of about 150 million tons. The original WC powder relies on the mining of mines and a series of chemical reactions to synthesize and prepare, which consumes a large amount of non-renewable tungsten and cobalt mineral resources, and the acid solution, sewage, harmful gases, etc. discharged during the cemented carbide preparation process cause a series of environmental problems and natural pollution. ecological destruction. Regenerated WC powder is made of waste cemented carbide as raw material, through certain physical or chemical treatment, to prepare a powder material that can partially or completely replace the original ceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F9/16
Inventor 刘雪梅宋晓艳魏崇斌王瑶聂祚仁王海滨付军高杨
Owner BEIJING UNIV OF TECH
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