Manufacturing technology for nitrogen-containing hard alloy

A technology of cemented carbide and manufacturing process, applied in the field of nitrogen-containing cemented carbide manufacturing process, can solve the problems of difficult mass industrial production, no mass production, poor wettability, etc., to reduce production costs and achieve excellent alloy performance. , the effect of solving the scarcity of resources

Active Publication Date: 2014-08-20
SICHUAN KUNTIAN HARD ALLOY
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Problems solved by technology

However, since TiN decomposes at high temperature and has poor wettability with the binder metal cobalt in the alloy, it is very difficult to accurately control the N content and reduce the porosity of the alloy. Hot isostatic pressing equipment to complete, there is no capacity and conditions for mass production

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  • Manufacturing technology for nitrogen-containing hard alloy

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Embodiment approach

[0028] As an embodiment of the present invention, such as figure 1 As shown, a nitrogen-containing cemented carbide manufacturing process, using W, TiC, N 2 As a raw material, after being fully mixed, the following reaction occurs at high temperature:

[0029] 2W+C+TiC+N—→2WC+TiN

[0030] W captures C in TiC to form WC, and free Ti and N form TiN to form a TiCN solid solution. WC dissolves on the surface of TiCN solid solution particles, and the solid solution is made into a solid solution powder, and then the solid solution powder is added to WC and Co to form an alloy. .

[0031] As preferably, the specific process step of preparing solid solution powder is:

[0032] (1) Mix W and TiC thoroughly in a mixer, then put them into a graphite boat and compact them;

[0033] (2) Put the raw material treated in step (1) into the sintering furnace, heat it to 1400°C in vacuum, and keep it warm for 30 minutes to make W generate WC, then continue to heat up to 1550°C, and fill it w...

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Abstract

The invention discloses a manufacturing technology for nitrogen-containing hard alloy. W, TiC and N2 are taken as raw materials, are fully mixed uniformly and subjected to the following reaction at a high temperature: 2W+C+Ti+N->2WC+TiN; W captures C in TiC for generating WC, and dissociated Ti is reacted with N for generating TiN; a TiCN solid solution is formed, and WC is dissolved on surfaces of TiCN solid solution particles, so that a solid-solution powder is prepared from the solid solution; and then WC and Co are added into the solid-solution powder for preparing the alloy. According to the manufacturing technology, no expensive hot isostatic-pressing equipment is needed, and also the performances of the alloy are better than those of alloy products produced by employing a hot isostatic-pressing technology; and during sintering of the hard alloy, decomposition of TiN is inhibited, and also Co has good wettability on WC, so that the porosity of the alloy is substantially reduced, the alloy strength is improved, the mechanical properties of the alloy are improved, the cost is substantially saved, and batch production can be realized, and the manufacturing technology has extremely good practicality.

Description

technical field [0001] The invention relates to a hard alloy processing technology, in particular to a nitrogen-containing hard alloy manufacturing technology. Background technique [0002] Among cemented carbide materials, tantalum-containing cemented carbide has extremely superior physical properties and has always dominated tool materials. However, due to the scarcity of resources and it is a very important strategic resource, the price keeps rising. At present, it reaches 2700 yuan / KG. In order to save resources, finding a substitute for TaC is a long-term task that the cemented carbide industry has spared no effort, and domestic counterparts have been looking for substitutes. As an important research topic, replacing TaC with TiN in whole or in part is one of the very important research directions. TiN resources are abundant and cheap. Japan has done a lot of work in this area. It is said that the nitrogen-containing hard alloy has the same structural characteristi...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C29/04C22C1/05
Inventor 傅朝坤
Owner SICHUAN KUNTIAN HARD ALLOY
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