Metal/ceramic gradient material and preparation method thereof

A technology of gradient materials and ceramics, which is applied in the field of metal/ceramic gradient materials and its preparation, can solve the problems of low density of metal/ceramic gradient materials, large difference in calorific value between metal and ceramics, and inability to react, so as to achieve effective The effect of control, high density and full response

Active Publication Date: 2016-04-13
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the self-propagating high-temperature combustion synthesis method is only suitable for material systems with high exothermic reactions. The calorific value of metals and ceramics is quite different, and the sintering degree is different, which is difficult to control. Therefore, the self-propagating high-temperature combustion synthesis method is used to prepare The metal / ceramic gradient material has low density, large porosity, and low mechanical strength, and there are problems such as insufficient reaction or even inability to proceed with the preparation of materials in low exothermic reaction systems.

Method used

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  • Metal/ceramic gradient material and preparation method thereof
  • Metal/ceramic gradient material and preparation method thereof
  • Metal/ceramic gradient material and preparation method thereof

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Embodiment 1

[0040] This embodiment provides a method for preparing a WC / Co gradient material, wherein the method includes the following specific steps:

[0041] In this embodiment, W powder, C powder, and Co powder are selected as raw powder materials. The raw particle size of C powder is 70 μm, that of W powder is 10 μm, and that of Co powder is 5 μm. The metal sheath is made of 4mm thick 1Cr18Ni9Ti stainless steel plate.

[0042] 1. Ball milling powder:

[0043] The three powders of W powder, C powder and Co powder were ball milled with a planetary ball mill. The ball milling time was 6 hours, the rotation speed was 300r / min, and the ball-to-material volume ratio was 10:1. During the ball milling process, ethanol solvent was added for wet milling, so that To avoid the oxidation and reaction of W powder and C powder, the solid-liquid volume ratio is 1:1;

[0044] 2. Cold pressing and layering:

[0045] The number of gradient layers of the WC / Co gradient material in this embodiment is ...

Embodiment 2

[0051] This embodiment provides a method for preparing a Ti / TiC gradient material with a curved surface shape, wherein the method includes the following specific steps:

[0052] In this embodiment, Ti powder and C powder are selected as the original powder materials. The original particle size of the Ti powder and the C powder are both 100 μm, and the material of the metal sheath is TA1 titanium plate with a thickness of 2 mm.

[0053] 1. Ball milling powder:

[0054] Two kinds of powders, Ti powder and C powder, are ball-milled by a planetary ball mill. The ball-milling time is 15h, the rotating speed is 100r / min, and the volume ratio of ball to material is 6:1. During the ball-milling process, ethanol solvent is added for wet milling to avoid Ti powder, Oxidation and reaction of C powder, the solid-liquid volume ratio is 1:1;

[0055] 2. Cold pressing and layering:

[0056] The design gradient layer number of the Ti / TiC gradient material in this embodiment is 6 layers, the...

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Abstract

The invention provides a metal/ceramic gradient material and a preparation method thereof. The method comprises the steps that metal powder needed for each layer and element powder needed for ceramic synthesis are fully mixed and are subjected to mechanical alloying treatment according to designed gradient components, the number of gradient layers and the component content in each layer, and mixed powder needed for each layer is obtained; the mixed powder needed for each layer is subjected to cold pressing, and semi-densified powder blanks are obtained; the semi-densified powder blanks are laid up according to the designed gradient components, the number of gradient layers and the component content in each layer, and pre-formed blanks are obtained; the pre-formed blanks are vacuumized after being packaged through metal sheaths, and the packaged pre-formed blanks are obtained; and after the packaged pre-formed blanks are preheated, pulse current is applied to the packaged pre-formed blanks, so that a self-propagating high-temperature in-situ synthesis reaction is driven, and the metal/ceramic gradient material is obtained after the reaction finishes. The prepared metal/ceramic gradient material is full in reaction, high in density and good in bonding quality between gradient interfaces.

Description

technical field [0001] The invention relates to a metal / ceramic gradient material and a preparation method thereof, belonging to the technical field of metal matrix composite material preparation. Background technique [0002] Metal / ceramic functionally graded material refers to a new type of material in which metal and ceramics change continuously from one side to the other in the thickness direction, so that the properties and functions of the material also change in a gradient. The biggest feature of this material is Its composition or structure gradually transitions, and there is no obvious interface inside, which can avoid or alleviate the defects of stress concentration, cracking and peeling at the interface due to the large difference in physical properties during use when the material is heated, so that the material can be used at ultra-high temperature. It has good properties of fracture resistance, thermal shock resistance, heat insulation and relaxation of interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/23B22F3/02B22F3/105C22C1/05
CPCB22F3/02B22F3/105B22F3/23C22C1/058
Inventor 张艳苓曲海涛侯红亮王耀奇
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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