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Method and device for preparing metal-based composite material by electric current direct heating dynamic sinter hot pressing

A technology for composite material and preparation device, which is applied in the field of current direct heating dynamic sintering and hot pressing preparation of metal matrix composite materials, can solve problems such as technical and theoretical problems yet to be studied, and achieves shortening powder sintering time, improving production efficiency and saving energy. energy effect

Inactive Publication Date: 2008-02-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Of course there are still many technological and theoretical issues to be studied

Method used

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  • Method and device for preparing metal-based composite material by electric current direct heating dynamic sinter hot pressing
  • Method and device for preparing metal-based composite material by electric current direct heating dynamic sinter hot pressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present invention adopts a current direct heating dynamic sintering hot pressing furnace. As shown in Figure 1, the current direct heating dynamic sintering hot pressing furnace consists of five parts. The order of connection is: circuit control system, induction voltage regulator, dry transformer, Hot pressing furnace and computer data acquisition system.

[0050] As shown in FIG. 2, the output terminal of the circuit control system is connected with the input terminal of the induction voltage regulator 1, and the circuit control system provides a periodically changing working current, which is output to the induction voltage regulator 1. The function of the induction voltage regulator 1 is to complete the first voltage regulation, and the input voltage can be changed by controlling the induction voltage regulator 1. It can adjust the voltage from 220V to 100~500V. The input end of the dry-type transformer 16 is connected to the output end of the induction voltage regu...

Embodiment 2

[0054] The preparation of iron-based composite material reinforced with 10% SiC particles by volume percentage (additional 0.5-1% zinc stearate by mass fraction) is formed by pressing by the general powder metallurgy sintering method, in a protective atmosphere for decomposing ammonia Sintering, the sintering temperature is 1110~1150℃, and the holding time is 1~1.5 hours. Its performance is shown in Table 2:

[0055] Table 2 Mechanical properties of ordinary powder metallurgy sintered materials

[0056] SiC volume

[0057] Using the current direct heating dynamic sintering hot pressing process of the present invention, the mechanical properties of the iron-based composite material containing 10% SiC by volume percentage prepared by direct heating and sintering under the output voltage of the induction transformer at 360V for different time (interval 100s) are shown in Table 3:

[0058] Table 3 Mechanical properties of sintered materials under direct current heating

[00...

Embodiment 3

[0062] For the current direct heating sintering process, if the mold is not processed, the current will pass through the mold and the sintered material at the same time. The comparison process can be defined as an ordinary current dynamic hot pressing sintering process; while the current direct heating dynamic sintering hot pressing process of the present invention Through the processing of the mold, the current completely passes through the sintered material. The mechanical properties of 10% SiC iron-based composites sintered by these two processes are shown in Table 4:

[0063] Table 4 Preparation of 10% SiC by different processes p Density and mechanical properties of / Fe composite

[0064]

[0065] It can be seen that the density and mechanical properties of the samples prepared by the electric current direct heating dynamic sintering process are higher than those of the ordinary electric current heating hot pressing sintering process. Therefore, the improvement of t...

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Abstract

The invention relates to a metal base composite material electric hot-pressed preparation and its device, which adopts electric hot-pressed furnace that comprises circuit control system, induction regulator, air-immersed transformer, dynamic caking furnace and computer data acquisition system. Thermal sintering mould comprises housing of normal carbon steel, mould and insulating ceramic layer, and mould is made of iron or high-purity carbite and its inner wall is embed insulating ceramic layer. The process proceeds under the conditions of pressure of 50-60MPa, input voltage of 5-20V and clinkering time of 5-20 minutes. The invention can produce products by high sintering in short time making use of low voltage and heavy current, and can produce product with good strength for extension and hardness.

Description

Technical field [0001] The invention relates to the technical field of manufacturing metal matrix composite materials, and in particular to a method and device for preparing metal matrix composite materials by direct current heating dynamic sintering hot pressing. Background technique [0002] Metal-matrix composites (MMC) are a type of composite materials, which have attracted people's attention because of their high specific strength, high specific modulus, high wear resistance and other excellent properties. The manufacturing process methods of MMC are generally divided into three categories, namely diffusion method, deposition method and casting method as shown in Table 1. [0003] Table 1 Comparison of manufacturing methods of metal matrix composites [0004] Method Enhancer Advantage Disadvantage Expand Scattered Law Powder metallurgy Pellets, short fibers Easy to handle, low reactivity Low productivity, high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/12
Inventor 王刚宗亚平杨玉芳
Owner NORTHEASTERN UNIV LIAONING
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