Method for preparing diffusion couple by using powder

A technology of powder preparation and diffusion couple, which is applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of high cost and complicated process, achieve low-cost preparation, increase the interface contact area, and improve the effect of sintering quality

Inactive Publication Date: 2008-09-03
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method is complex and expensive
However, the technology of directly preparing diffusion couples from powders has not been reported yet.

Method used

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  • Method for preparing diffusion couple by using powder
  • Method for preparing diffusion couple by using powder
  • Method for preparing diffusion couple by using powder

Examples

Experimental program
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Embodiment Construction

[0021] 1. see figure 1 , Fill the metal casing with calcium oxide (CaO) powder, and use a press to press it until it is tight to form a compact. The metal sleeve is made of low-carbon steel or stainless steel or copper alloy or titanium alloy. When selecting a metal sleeve, it should be chosen not to cause interdiffusion or chemical reaction with the powder in contact, and it is easy to peel off the metal sleeve. As in this embodiment, the metal tube sleeve should be selected that does not interdifgate or chemically react with calcium oxide, so as to avoid the impact of the metal tube on the diffusion sintering process and facilitate the removal of the sleeve. In addition, the selected metal sleeve should also be easy to cut and process, so that it can be processed according to the shape of the indexed diffusion couple. Melting of the tube produces liquid metal attack on the diffusion couple material and facilitates removal of the sleeve after sintering is complete.

[0022]...

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Abstract

The invention relates to a method for producing diffusion couple with powders including the following steps: (1) powder material A is filled in a metal casing which do not diffuse or react with the contacted powder and then is pressed to form a compact; (2) the compact is punched by a die with a diameter which is 4-6 mm smaller than the inner diameter of the metal casing; (3) another powder material B is filled in the holes and then treated by compaction, sintering at a certain temperature, air-cooling to get a diffusion couple. The ring canning diffusion couple produced by compacting powder in the invention utilizes the high shrinkage of the outer powder in the sintering process to provide a interfacial binding force to the powder material of each layer in the jacket, thereby guaranteeing a full integration of the powder in each layer and providing a possibility to the preparation and the interface study of the layered composite powder materials.

Description

technical field [0001] The invention relates to a method for making a powder-layered composite material, in particular to a method for preparing a diffusion couple by using the atom and ion diffusion process and interface combination between different powder materials. Background technique [0002] Currently, diffusion couples are both a dissimilar material joining technique and an experimental method. It is often widely used in the diffusion of metal atoms, the study of material diffusion connection technology, the diffusion of intermetallic interfaces, the study of phase equilibrium, and the theoretical study of solid / solid phase reaction processes. Among them, diffusion welding, as a precision welding method, has been widely used in the connection and diffusion mechanism research of the same or dissimilar metal materials. [0003] In recent years, with the development of ceramic materials, people have gradually applied diffusion couple technology to the research and prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622B28B3/00C04B37/00
Inventor 高家诚王勇张艳
Owner CHONGQING UNIV
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