A kind of multi-component composite ti(c,n) cermet and preparation method thereof

A multi-component composite and cermet technology, which is applied in the field of ceramic matrix composite materials, achieves the effects of shortening the preparation process, short holding time, and reducing raw material costs and energy consumption

Active Publication Date: 2020-05-15
HAINAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can better control the addition of the second type of carbides, reduce the number of core phase / annular phase interfaces and the adverse effects on performance caused by interfacial stress and component segregation during multiphase sintering, it can improve the performance of metals to a certain extent. The toughness of ceramics, but it still belongs to the category of traditional methods, and has not fundamentally changed the obvious problems in the preparation process of cermets

Method used

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  • A kind of multi-component composite ti(c,n) cermet and preparation method thereof
  • A kind of multi-component composite ti(c,n) cermet and preparation method thereof
  • A kind of multi-component composite ti(c,n) cermet and preparation method thereof

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preparation example Construction

[0047] The invention provides a method for preparing multi-element composite Ti(C,N) cermets, comprising:

[0048] A) Ti source, M source and carbon source, and nickel source and / or cobalt source are mixed, and ball milled to obtain activated raw material powder; The M is Mo, W, Ta, Nb, V, Cr, La and Y any one or several;

[0049] B) The prepared activated raw material powder is subjected to discharge plasma in-situ carbothermal reduction reaction and sintering to obtain a multi-component composite Ti(C,N) cermet.

[0050] In the present invention, firstly, the metal oxide raw material is pretreated by mechanical ball milling to obtain evenly mixed raw material fine powder. Next, using the discharge plasma technology, the activated powder is used as the raw material, and the cermet material is obtained by direct and rapid reaction sintering. The present invention omits the two steps in the prior art that the cermet raw material powder needs to be separately prepared in advan...

Embodiment 1

[0078] The graphite mold that the present invention adopts please refer to Figure 3 to Figure 5 ,in, image 3 and Figure 4 Both are schematic diagrams of the first cover. The installation methods of the first cover and the second cover are similar. For the installation direction of the second cover, please refer to Figure 3 to Figure 4 .

[0079] In this embodiment, the first cover plate 1-6 and the second cover plate 1-7 both include a first end and a second end, the diameter of the first end is greater than the diameter of the second end, and the second end of the first cover plate 1-6b is used to be placed in the first cover plate hole 2, and there is a gap between the second end 1-6b of the first cover plate and the bottom end of the first cover plate hole 2, the first end of the first cover plate 1-6a and the stepped surface formed by the second end 1-6b of the first cover plate is used to abut against the main body 1;

[0080] The second end of the second cover pl...

Embodiment 2

[0087] (1) Preparation and ingredients of raw material powder

[0088] 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 material TiO 2 、WO 3 、MoO 3 、Co 4 o 3 , NiO and carbon powder weighing ingredients.

[0089] (2) Mechanical ball milling activation of raw material powder

[0090] Put the above-mentioned prepared raw materials into a ball mill tank, and put in balls at a ball-to-material ratio of 20:1, and perform mechanical ball milling on the raw materials for 35 hours on a high-energy ball mill to obtain evenly mixed fine powder of activated raw materials.

[0091] (3) Rapid preparation of product cermets

[0092] After putting the above-mentioned appropriate amount of activated raw material powder into the graphite mold, the mold is placed in the heating chamber of the discharge plasma system to carry out the discharge plasma in-situ carbothermal reduction reaction and si...

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Abstract

The invention provides a preparation method of multi-component composite Ti(C,N) metal ceramic. The preparation method comprises the steps of (A) mixing a Ti source, an M source and a carbon source aswell as a nickel source and / or a cobalt source, and performing ball-milling treatment so as to obtain activated raw material powder, wherein M is one or more of Mo, W, Ta, Nb, V, Cr, La and Y; (B) performing a discharge plasma in-situ carbon thermal reduction reaction on the prepared activated raw material powder, and sintering so as to obtain the multi-component composite Ti(C,N) metal ceramic.According to the preparation method, firstly, metal oxide raw materials are pretreated by utilizing mechanical milling so as to obtain fine raw material powder which is uniformly mixed, and then direct rapid reaction and sintering are performed by utilizing a discharge plasma technique and using the activated powder as raw materials so as to obtain the metal ceramic. According to the preparation method, two steps of preliminary preparation of the raw material powder of the metal ceramic and preforming of the raw material powder before the metal ceramic is sintered are omitted, so that the costof raw materials and energy consumption are reduced, and the preparation process flow of the metal ceramic is shortened and simplified.

Description

technical field [0001] The invention relates to the technical field of ceramic-based composite materials, in particular to a multi-component composite Ti(C,N) cermet and a preparation method thereof. Background technique [0002] Ti(C,N)-based cermets have the advantages of high melting point, high hardness, good thermal conductivity, chemical stability and wear resistance, and are more suitable for tooling and mold materials. At present, the most important application field of Ti(C,N)-based cermets is finishing in metal cutting process, and has been successfully applied in high-speed cutting of high-strength steel and cast iron. Compared with traditional WC-Co cemented carbide tools, Ti(C,N)-based cermet tools can not only improve the surface machining accuracy, but also ensure the dimensional accuracy and tolerance control of the workpiece. [0003] The main components of Ti(C,N) cermets are Ti(C,N) hard phase, and Ni or Co or Ni / Co binder phase. At the same time, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/04
CPCC22C1/055C22C1/058C22C29/04
Inventor 向道平李慧
Owner HAINAN UNIV
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