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Production line and production process of a low-oxygen cemented carbide mixture

A technology of cemented carbide and low oxygen content, which is applied in the field of powder metallurgy to prepare cemented carbide to achieve the effect of avoiding oxidation, improving stability and controllability

Inactive Publication Date: 2016-05-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lead to high oxygen content and unstable quality of final WC
When used to prepare cemented carbide, the amount of carbon is not easy to control, resulting in the appearance of graphite phase or carbon-poor phase in the final alloy, and the performance of cemented carbide decreases

Method used

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  • Production line and production process of a low-oxygen cemented carbide mixture
  • Production line and production process of a low-oxygen cemented carbide mixture

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Embodiment Construction

[0022] Cemented carbide with a WC grain size of less than 0.2 microns has very high strength and toughness. Due to the growth of WC during sintering, the particle size of WC powder needs to be less than 100 nm. This requires first obtaining nanoscale WO through nanotechnology 3 . Then, nanoscale WC is obtained through reduction carbonization.

[0023] Nanoscale WC is very active and can spontaneously ignite in air. If not spontaneously combustible, it has a high oxygen content. This has a great influence on the control of the carbon content and the properties of the final alloy.

[0024] Nano WO 3 The preparation of nano-WC needs to go through the reduction and carbonization stages, and these two high-temperature stages will make the nanoparticles grow up. In order to inhibit the growth, the nano-WO 3 It is reduced to nano-blue tungsten, then reduced to nano-tungsten powder, then carbonized, and finally carbonized to obtain nano-tungsten carbide. The next step is to pr...

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Abstract

The present invention relates to a production line of cemented carbide mixture with low oxygen content. The production line is composed of a reduction part for preparing blue tungsten powder, a reduction part for preparing tungsten powder, a carbonization part and a granulation part to form a closed system; the present invention The production line can make the nano-tungsten trioxide be in the closed production line from the inlet of the rotary reduction furnace at the starting end to the outlet of the spray drying tower at the end. The closed production line is filled with nitrogen or hydrogen, so that the nano-powder will never contact the outside air, thereby reducing the particle size of the nano-WC and preventing the oxidation and spontaneous combustion of the nano-WC, reducing the oxygen content of the cemented carbide mixture, and improving the ultra-fine particle size. The stability and controllability of the quality of the crystalline carbide can be improved, and the overall performance of the alloy can be improved.

Description

field of invention [0001] The invention relates to a production line of a low-oxygen-content nano-tungsten carbide mixture and a production process thereof, and belongs to the field of cemented carbide prepared by powder metallurgy. Background of the invention [0002] Cemented carbide is sintered with WC as the hard phase and Co as the binder phase through high-temperature liquid phase sintering. Cemented carbide has high hardness, high strength and high wear resistance. Its appearance has revolutionized machining and is known as "the tooth of industry". [0003] Modern industry has higher and higher requirements for the comprehensive performance of cemented carbide cutting tools, tools and molds, and wear-resistant parts, mainly reflected in: 1) The comprehensive promotion of high-efficiency and high-precision CNC machine tools has put forward higher requirements for tool life and cutting efficiency ; 2) The performance of the processed material is improving day by day,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
Inventor 林涛王志张深根邵慧萍何新波
Owner UNIV OF SCI & TECH BEIJING
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