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Superfine multi-component composite ceramic powder and preparation method thereof

A multi-component composite, ceramic powder technology, applied in the field of ceramic powder materials, can solve the problems of long reaction time, difficult ultra-fine or nano product powder, and high reaction temperature, achieve short holding time, improve driving force and diffusion capacity , the effect of low synthesis temperature

Active Publication Date: 2017-10-24
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature of the conventional carbothermal reduction method is high and the reaction time is long, so it is difficult to directly prepare ultrafine or nano product powders by this method

Method used

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  • Superfine multi-component composite ceramic powder and preparation method thereof
  • Superfine multi-component composite ceramic powder and preparation method thereof
  • Superfine multi-component composite ceramic powder and preparation method thereof

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preparation example Construction

[0033] The invention provides a method for preparing an ultrafine multi-element composite ceramic powder, comprising:

[0034] A) mixing Ti source, M source and carbon source, and high-energy ball milling to obtain activated nanocrystalline raw material powder;

[0035] B) subjecting the prepared activated nanocrystalline raw material powder to a discharge plasma carbothermal reduction reaction to obtain an ultrafine multi-element composite ceramic powder.

[0036] In the present invention, ball milling is used to pretreat the raw materials to obtain evenly mixed nanocrystalline raw material powders. At the same time, the technical characteristics of discharge plasma sintering are fully utilized. Compared with conventional carbothermal reduction reactions, the heating rate is very fast, and the synthesis temperature is low. The short holding time and other advantages make it easier to obtain product powder with finer particle size. The ingenious combination of ball milling an...

Embodiment 1

[0065] The graphite mold that the present invention adopts please refer to Figure 3 to Figure 4 ,in, image 3 is a schematic diagram of the structure of the graphite mold indenter; Figure 4 It is a schematic diagram of the structure after the main part of the graphite mold is assembled with the indenter.

[0066] The first indenter 1-1 is placed in the first indenter hole 2, and the second indenter 1-2 is placed in the second indenter hole 4.

[0067] It should be further explained that when loading samples, just put the indenter directly into the indenter hole of the graphite paper, and the axial lengths of the two indenters must be the same. Preferably in the present invention, the length of the indenter is higher than that of the indenter hole , which is convenient for sampling.

[0068] It should also be noted that, in this specific embodiment, when the carbon thermal reaction is carried out, the graphite paper is closely attached to the cavity wall of the first inden...

Embodiment 2

[0070] (1) Preparation and batching of raw material powder

[0071] According to the prepared (Ti, 15W)C target product, determine the initial raw material mass ratio, and the raw material TiO 2 、WO 3 and carbon powder are weighed according to the mass ratio.

[0072] (2) Mechanical ball milling activation of raw material powder

[0073] Put the above-mentioned prepared raw materials into a ball mill tank, and put in balls at a ball-to-material ratio of 10:1, and perform mechanical ball milling on the raw materials for 50 hours in a vacuum atmosphere on a high-energy ball mill to obtain uniformly mixed nano-activated raw material powder.

[0074] (3) Rapid preparation of product composite powder

[0075] Put the above 4g activated raw material powder into the Φ20 (lofting area diameter) graphite mold, place it in the heating chamber of the discharge plasma sintering system, and carry out the discharge plasma in-situ carbothermal reduction reaction. The process conditions ar...

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Abstract

The invention provides a preparation method of superfine multi-component composite ceramic powder. The preparation method comprises the following steps: (A) mixing a Ti source, an M source and a carbon source, and carrying out high-energy ball milling to obtain activated nano-crystalline raw material powder; and (B) subjecting the prepared activated nano-crystalline raw material powder to a carbothermal reduction reaction, so as to obtain the superfine multi-component composite ceramic powder. According to the preparation method provided by the invention, raw materials are pretreated by utilizing the ball milling operation, thereby obtaining the uniformly-mixed activated nano-crystalline raw material powder; meanwhile, the technical characteristics of spark plasma sintering are sufficiently utilized; compared with a conventional carbothermal reduction reaction, the carbothermal reduction reaction involved in the invention has the advantages that the temperature rise rate is very high, the synthesis temperature is relatively low, the heat preservation period is very short, and a powder product of which the particle size is relatively small can be easier to obtain; and the ball milling operation and the spark plasma sintering operation are ingeniously combined, thereby improving the raw material reaction driving force and diffusivity, enhancing the component reactivity, greatly lowering the synthesis temperature, and shortening the reaction period.

Description

technical field [0001] The invention relates to the technical field of ceramic powder materials, in particular to an ultrafine multi-component composite ceramic powder and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermet is a new type of cemented carbide material with excellent performance and a wide range of uses developed on the basis of TiC-based cermet. The tool made of this material has good hardness and wear resistance, excellent red hardness and high temperature creep resistance, and the friction coefficient between the same metal is very low, low density, good chemical stability and oxidation resistance, Suitable for high-speed cutting and dry cutting of cast iron, ordinary steel and high-hardness steel. Therefore, Ti(C,N)-based cermets can successfully replace WC-based cemented carbide in many processing situations. However, there is still a gap between the strength and toughness of Ti(C,N)-based cermets and WC-based cemented carbid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20C22C1/05C22C29/04C22C29/06
CPCB22F9/20C22C1/055C22C1/056C22C29/04C22C29/06
Inventor 向道平李慧王钰午涂国鹏
Owner HAINAN UNIVERSITY
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