SiC_p/Cu composites prepared by pressureless infiltration of copper into porous SiC preforms

Abstract

SiC p /Cu composites with high reinforcement content (56-65 vol.-%) were fabricated by spontaneously infiltrating copper alloy into porous SiC preform obtained by powder injection moulding. The main influencing factors of the preparation of the preform and the infiltration behaviour of various preforms were studied. The results indicate that the viscosity increases with an increase in powder loading or decreases with an increase in particle size. The feedstocks with bimodal mixture exhibit low viscosity due to the improvement in packing efficiency. When small particles or bimodal mixture with large size ratio were used, the preforms were difficult to be fully infiltrated. The preforms debound in air exhibit lower infiltration rate than the ones debound in vacuum due to the reduction of porosity and the poor wettability between the oxidised layer and copper alloy. Kinetic analysis on the infiltration curves yielded activation energies of 253 kJ mol 21 .

Effects of Additives Content on the Properties of Porous SiC Ceramics

“…Porous silicon carbide (SiC) ceramics were one of the most forecast candidate materials, with many excellent properties such as low density, high strength, high porosity, high permeability, large specific surface area, excellent corrosion resistance, good insulation, good thermal shock resistance, excellent high temperature resistance and etc. [3,4].As we known, the strength of the materials was in an inversely proportional relationship with its porosity. The permeability for hot gas purification required high porosity, which led to a relatively low strength.…”

“…Porous silicon carbide (SiC) ceramics were one of the most forecast candidate materials, with many excellent properties such as low density, high strength, high porosity, high permeability, large specific surface area, excellent corrosion resistance, good insulation, good thermal shock resistance, excellent high temperature resistance and etc. [3,4].…”

Preparation and Properties of SiC Porous Ceramics Made by Oxidation-Bonding Technique

“…Porous ceramics has wide application in the metallurgical, chemical and other fields. Preparation of porous SiC ceramics has a variety of methods [7][8][9][10] and Oxidation bonding method [7] is one of them. Using SiC, Al 2 O 3 powder as raw material, carbon black (C) as a pore forming agent, after pressing and drying, the samples are then fired in the temperature range between 1100ºC and 1500ºC.…”

Friction and Wear Behavior of SiC_P/Cu Composite Prepared by Powder Injection Molding

“…Currently, the preparation method of SiC p /Cu composite mainly includes the powder metallurgic method followed by the hot rolling or the hot extrusion; in addition, the preparation method also include cold pressing sintering, hot pressing sintering, extrusion casting, squeeze casting, pressureless infiltration, composite electroforming, mechanical alloying, etc. [1][2][3][4][5] As the most advanced powder metallurgy technology, the advantages of powder injection molding (PIM) lie in forming complicated-shaped small parts on a large scale, applicable to a wide range of materials, uniform density in different parts of the products and excellent performance of the products. Some studies have reported on copper prepared by PIM [6], but still, few studies have reported on the preparation of SiC p /Cu composite by PIM.…”