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Method for preparing gradient metal-containing three-dimensional network ceramic

A three-dimensional network and cermet technology, which is applied to the preparation of gradient metal-containing three-dimensional network ceramics and the field of preforms of network ceramics reinforced metal composite materials, can solve the problems of high cost, complex process, metal and ceramic cracks, etc. Mature technology to solve the effect of low interface bonding strength

Inactive Publication Date: 2014-10-01
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

K. Lemster etc. disclosed a method of pressureless impregnation after the activation treatment of metal titanium on the surface of the porous ceramic body, which solved the problem of the wettability of the porous ceramic body impregnated with Fe alloy melt, but the cost is high and the process is complicated. And the interface bonding depends on the quality of the coating, and there are obvious cracks between the metal and the ceramic
The above methods do not substantially solve the problem of interfacial bonding, which limits the application of three-dimensional continuous network structure ceramic / metal composites in production.

Method used

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  • Method for preparing gradient metal-containing three-dimensional network ceramic
  • Method for preparing gradient metal-containing three-dimensional network ceramic
  • Method for preparing gradient metal-containing three-dimensional network ceramic

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Embodiment 1

[0040] Below with preparation nickel-containing 20wt% porous ceramic process, the present invention is described in detail:

[0041] Select the granulated 95 porcelain Al2O3 ceramic powder provided by China Aluminum Co., Ltd., the particle size is in the range of 0.1-0.5mm, the main composition: 2.5wt%SiO 2 , 2.0 wt % CaO, 0.5 wt % MgO, Al 2 o 3 Surplus, nickel powder, the purity of nickel powder is 99.96%, and average particle size is 40 μ m, and the dosage of various additives is shown in Table 1:

[0042] Table 1 Ceramic aggregates and additives

[0043]

[0044] The specific steps and process conditions are as follows, see the flow chart figure 1 :

[0045] Step 1: Mix the powder

[0046] The selected metal powder is mechanically mixed with commercial ceramic powder to prepare mixed powders with different metal contents, wherein, in terms of mass fraction, the metal powder content is 20wt%;

[0047] Step 2: Ball Milling

[0048] The mixed powder mechanically m...

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Abstract

The invention relates to a method for preparing gradient metal-containing three-dimensional network ceramic. The method comprises the preparation of a gradient metal-containing ceramic precursor and the sintering of the ceramic precursor, wherein the preparation of the gradient metal-containing ceramic precursor comprises selection of organic foam and preparation of a ceramic size, preparation of the precursor by virtue of an organic foam steeping method, and the sintering of the ceramic precursor. The gradient metal-containing three-dimensional network ceramic can be applied to preparation of a ceramic enhanced metal-based composite material, a mode of only having mechanical bonding of a boundary between metal ceramic and metals in a composite material is improved into a mode of mixing mechanical bonding with diffusion bonding, and the bonding strength of the ceramic and metal phase in the composite material can be greatly enhanced.

Description

technical field [0001] The invention belongs to the field of structural ceramic preparation, and more specifically relates to a method for preparing a three-dimensional network ceramic containing gradient metal. The material can be used as a prefabricated body for preparing a network ceramic reinforced metal composite material with high interface bonding strength. Background technique [0002] The ceramic / metal composite material with three-dimensional continuous network structure combines the respective advantages of metal and ceramics, and its excellent wear resistance is widely used in aerospace, automobile industry, food and pharmaceutical industries. The interface between the alloy and the ceramic is the key to the preparation of the three-dimensional continuous network structure alumina ceramic / metal composite, but the wettability between the alumina ceramic and the alloy is very poor, and the interface bonding is difficult. [0003] At present, the solutions are: 1. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C29/00C04B38/00
Inventor 杨少锋张炎陈维平朱晨
Owner NANJING INST OF TECH
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