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Powder sintering molding method and mold

A technology of sintering molding and molding method, which is applied in the field of electric heating metal powder sintering, can solve the problems of large shunt current and influence on heating effect, and achieve the effects of increasing current density, optimizing heating effect, and reducing power load

Inactive Publication Date: 2017-03-22
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the die will generate shunt during heating, the shunt current will be very large, which will directly affect the heating effect

Method used

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  • Powder sintering molding method and mold
  • Powder sintering molding method and mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the method used here is specifically the SPS molding method.

[0025] The method is to install the powder material in the concave mold and feed the heating current, and carry out discharge plasma heating on the powder material under the condition that the concave mold is prevented from shunting the heating current, so that the powder material is sintered and formed under pressure. Wherein the sintering molding is carried out under vacuum conditions, avoiding the shunting heating current of the concave mold is realized by using a composite concave mold or setting the concave mold as an insulating concave mold, and the composite concave mold includes an outer layer and an inner layer arranged in the outer layer. Insulation on walls. The outer layer of the composite die is made of graphite, and the insulating layer material is made of insulating ceramics, of which the insulating ceramic material is Al with a content greater than 95%. 2 o 3 Ceramics (o...

Embodiment 2

[0028] In this embodiment, the method adopted here is specifically a powder warm pressing molding method.

[0029] The method is suitable for compression molding below 900°C, and the powder metallurgy molding is performed on a press with a heating power supply. In the method, the powder material is installed in the concave mold and a heating current is passed through, and the powder material is subjected to resistance heating under the condition that the concave mold is prevented from shunting the heating current, so that the powder material is sintered and formed under pressure. Avoiding the shunting of the heating current by the concave mold is realized specifically by using a composite concave mold, and the composite concave mold includes an outer layer and an insulating layer arranged on the inner wall surface of the outer layer. The outer layer of the composite die is a metal outer layer, and the insulating layer material is made of insulating ceramics, of which the insul...

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Abstract

The invention relates to the technical field of electric heating metal powder sintering, in particular to a powder sintering molding method and mold. According to the method, a powder material is contained in a concave mold, heating current is input, the powder material is extruded under the condition of preventing the concave mold from shunting the heating current, and the powder material is subjected to sintering molding under pressure. Due to the fact that the heating current is input to the powder material under the condition of preventing the concave mold from shunting the heating current, the current density of the powder material can be increased, and the power load can be reduced; and in addition, the size of the concave mold is far larger than that of the powder material, and therefore after the current shunting function of the concave mold is eradicated, the heating effect of the powder material can be optimized to a large degree.

Description

technical field [0001] The invention relates to the technical field of electric heating metal powder sintering, in particular to a powder sintering molding method and a molding die. Background technique [0002] Powder metallurgy is a kind of powder sintering molding technology. It uses metal powder (or a mixture of metal powder and non-metal powder) as raw material to manufacture metal materials, composite materials and various types of products. It has a unique chemical composition and Mechanical and physical properties have very broad development prospects. [0003] Spark plasma sintering (Spark Plasma Sintering, referred to as SPS) is a kind of powder metallurgy technology. It applies the ON-OFF DC pulse voltage generated by the special power control device to the powder blank, and uses the discharge machining (discharge impact pressure and Joule heating) to sinter the billet, and at the same time, it also effectively utilizes the spark discharge phenomenon (instant gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/14
CPCB22F3/105B22F3/1241B22F3/1258B22F3/14
Inventor 杨茜虞跨海杨永顺杨正海皇涛
Owner HENAN UNIV OF SCI & TECH
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