Gel method preparation process for SiC/Al composite powder

A technology of composite powder and preparation process, which is applied in the field of composite powder preparation, can solve the problems of limited use of SiC/Al composite materials, insufficient two-phase dispersion, and low product yield, so as to improve performance and product quality. The qualified rate of appearance, wide range of use, and the effect of reducing production cost

Inactive Publication Date: 2015-08-19
SHENYANG LIGONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the relatively mature preparation methods of SiC / Al composite materials are high-energy ball milling method, pressure infiltration method, etc. The problems existing in the prepared composite materials are mainly due to the low yield rate of products caused by insufficient two-phase dispersion, and qualified products in the In the process of use, there are problems such as short service life, serious aging damage, and unstable performance, which seriously limit the performance and application fields of SiC / Al composite materials.

Method used

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  • Gel method preparation process for SiC/Al composite powder
  • Gel method preparation process for SiC/Al composite powder
  • Gel method preparation process for SiC/Al composite powder

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Embodiment 1

[0037] According to the slurry A and slurry B made of different premix components, add a small amount of slurry A to slurry B several times and mix for 20-30min. At this time, the solid phase in the slurry basically tends to be stable and uniformly dispersed; Add a catalytic-initiating system to the slurry to promote the solidification of the colloidal components in the slurry. This process does not exceed 30s; according to image 3 During the process, the green body is dried at room temperature / 48h, 70°C / 24h, and the dried green body is Figure 4 Degreasing treatment at 100°C-450°C is carried out in the equipment to obtain a composite powder with uniform composition. Figure 5 (a) and (b) are scanning electron micrographs of degreased composite powders with SiC volume fractions of 17% and 25%, respectively. The irregular shapes and sharp corners in the figure are SiC. Observing the distribution of SiC in the composite powder, it can be seen that SiC in the composite powder ...

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Abstract

The invention discloses a gel method preparation process for SiC / Al composite powder. The gel method preparation process for the SiC / Al composite powder includes the following steps that a premixed solution A and a premixed solution B with certain components are obtained through wet method mixing; 7.24 parts of SiC powder is added into the premixed solution A and stirred for 2-5 min through an ultrasonic blending machine, and a slurry A is obtained; 6.73 parts of Al powder is added into the premixed solution B and stirred for 10-20 min mechanically, and a slurry B is obtained; the slurry A is added into the slurry B multiple times and mixed for 20-30 min, then catalysts-initiators for catalyzing gel component gel-clot reaction are added, the slurry is promoted to be solidified to form a wet blank, and the process is less than 30 s; after the wet blank is dried and degreased, two-phase uniformly dispersed composite powder is obtained. Instability of mechanical properties caused by enhanced phase agglomeration in the composite materials is avoided, the enhanced phase proportion in the composite powder can be adjusted within the range of 5-38 percent, and the application range is enlarged.

Description

technical field [0001] The invention relates to the field of preparation of composite powders, in particular to a gel method preparation process of SiC / Al composite powders. Background technique [0002] SiC / Al composite materials have been widely used in many fields such as electronic packaging materials and wear-resistant materials due to their excellent electrical properties, wear resistance and high temperature stability. At present, the relatively mature preparation methods of SiC / Al composite materials are high-energy ball milling method, pressure infiltration method, etc. The problems existing in the prepared composite materials are mainly due to the low yield rate of products caused by insufficient two-phase dispersion, and qualified products in the In the process of use, there are problems such as short service life, serious aging damage, and unstable performance, which seriously limit the performance and application fields of SiC / Al composite materials. Contents ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 杜晓明刘凤国张学萍衣爱丽
Owner SHENYANG LIGONG UNIV
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