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Method for preparing composite Ti (C,N) metal ceramic powder through microwave carbon thermal reduction

A cermet and carbon thermal technology, which is applied in the field of microwave carbon thermal reduction to prepare composite Ti cermet powder, can solve the problems of high reaction temperature, long reaction time, and difficulty in fine product powder, and achieve low synthesis temperature and heat preservation Effect of short time, improvement of raw material reaction driving force and diffusion ability

Active Publication Date: 2018-10-12
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional carbothermal reduction methods generally start with N 2 As a nitrogen source, due to the high N-N bond energy, the reaction temperature is high and the reaction time is long, so it is difficult to directly use this method to prepare finer product powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation and batching of raw material powder

[0022] According to the prepared Ti(C 0.7 ,N 0.3 )-Ni target product, determine initial raw material mass ratio, raw material melamine, TiO 2 , NiO and carbon powder are weighed according to the determined mass ratio.

[0023] (2) Mechanical ball milling activation of raw material powder

[0024] Put the above-mentioned prepared raw materials into a ball mill tank, and put them into balls according to the ball-to-material ratio of 10:1, and perform mechanical ball milling on the raw materials for 30 hours on a high-energy ball mill to obtain evenly mixed nanocrystalline activated raw material powder.

[0025] (3) Rapid preparation of product composite powder

[0026] Put the above 10g activated raw material powder into the crucible, place it in the heating chamber of the microwave sintering system, and carry out the microwave in-situ carbothermal reduction reaction. The holding time is 10 minutes.

[0027] Thro...

Embodiment 2

[0029] (1) Preparation and batching of raw material powder

[0030] According to the prepared (Ti,15W)(C 0.7 ,N 0.3 )-Ni target product, determine initial raw material mass ratio, raw material melamine, TiO 2 、WO 3 , NiO and carbon powder are weighed according to the determined mass ratio.

[0031] (2) Mechanical ball milling activation of raw material powder

[0032] Put the above-mentioned prepared raw materials into a ball mill tank, and put them into the balls according to the ball-to-material ratio of 20:1, and perform mechanical ball milling on the raw materials for 20 hours on a high-energy ball mill to obtain evenly mixed nanocrystalline activated raw material powder.

[0033] (3) Rapid preparation of product composite powder

[0034] Put the above 10g activated raw material powder into the crucible, put it in the heating chamber of the microwave sintering system, and carry out the microwave in-situ carbothermal reduction reaction. The holding time is 10 minutes....

Embodiment 3

[0037] (1) Preparation and batching of raw material powder

[0038] According to the prepared (Ti,15W,10Mo)(C 0.7 ,N 0.3 )-(Ni,Co) target product, determine the mass ratio of the initial raw materials, the raw materials melamine, TiO 2 、WO 3 、MoO 3 , NiO, Co 3 o 4 and carbon powder are weighed according to the determined mass ratio.

[0039] (2) Mechanical ball milling activation of raw material powder

[0040] Put the above-mentioned prepared raw materials into a ball mill tank, and put them into balls according to the ball-to-material ratio of 30:1, and perform mechanical ball milling on the raw materials for 10 hours on a high-energy ball mill to obtain evenly mixed nanocrystalline activated raw material powder.

[0041] (3) Rapid preparation of product composite powder

[0042] Put the above 10g activated raw material powder into the crucible, place it in the heating chamber of the microwave sintering system, and carry out the microwave in-situ carbothermal reducti...

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Abstract

The invention belongs to the technical field of metal ceramic material preparation, and discloses a method for preparing composite Ti (C,N) metal ceramic powder through microwave carbon thermal reduction. Activated raw powder is obtained by conducting high-energy ball milling on cyanamide compounds, Ti source compounds, M source compounds and carbon source powders, and then the microwave in-situ carbon thermal reduction reaction is carried out to obtain the composite Ti (C,N) metal ceramic powder. According to the method, the cyanamide compounds are used as the raw material, a nitrogen sourceand a partial carbon source can be provided, meanwhile, the reaction temperature can be partially reduced, and the composition of the product powder obtained after nitridation reaction is more uniform; the raw materials are pre-treated by using high-energy ball milling, not only uniformly mixed nanocrystalline raw material powder can be obtained, but also the reaction driving force and diffusion ability of the raw materials can be improved, the reaction activity of elements is enhanced, and the subsequent synthesis temperature is reduced. Compared with a conventional carbon thermal reduction reaction, the method does not need N2 atmosphere requirements, the operation is simpler, and the product powder with the finer particle size is obtained more easily.

Description

technical field [0001] The invention belongs to the technical field of cermet material preparation, and in particular relates to a method for preparing composite Ti(C,N) cermet powder through microwave carbothermal reduction. Background technique [0002] Ti(C,N) cermet has the advantages of high hardness, high melting point, corrosion resistance, wear resistance, good thermal and chemical stability, etc. It is the preferred substitute material for WC cemented carbide and is widely used in tools and molds and other industries. However, there is still a gap between the strength and toughness of Ti(C,N) cermets and WC cemented carbide, which greatly limits its application. In order to improve the fracture toughness of cermets, the preparation of composite (Ti,M)(C,N) cermets with weak / coreless-ring structure composed of multi-component composite Ti(C,N) solid solution and metal binder phase is a kind of trend. In order to obtain high-strength and toughness composite Ti(C,N)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22C22C29/04
CPCC22C29/005C22C29/04B22F9/22
Inventor 向道平李慧
Owner HAINAN UNIVERSITY
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