The invention relates to an Al/Sic and Cu/Sic composite material friction pair used for railway vehicles and a manufacturing method of the Al/Sic and Cu/Sic composite material friction pair and belongs to the technical field of manufacturing of friction pairs. A friction pair in the prior art has the defects of being complex in the production technology, poor in heat conduction performance and short in service life. A network silicon carbide ceramic framework is embedded in the friction face of the friction pair, a plurality of heat dissipating ribs are arranged in the circumferential direction of the other side of the friction pair, a ventilation channel penetrating through a brake disk is formed in the middle of each heat dissipating rib, the network silicon carbide ceramic framework is embedded in the friction face of a Cu/Sic brake pad, and latticed heat dissipating fins are arranged on the other side of the Cu/Sic brake pad. The manufacturing method of the Al/Sic and Cu/Sic composite material friction pair includes the steps of manufacturing the network silicon carbide ceramic framework, pretreating the framework, designing and manufacturing the brake disk and a brake pad casting die, casting the brake disk and the brake pad at low pressure, performing thermal treatment on the brake disk and the brake pad, performing precision machining on the brake disk and the brake pad and putting the finished product in storage. The Al/Sic and Cu/Sic composite material friction pair is simple in manufacturing technology, light in weight, high and stable in frictional coefficient, good in heat conduction performance, long in service life and suitable for the existing railway vehicles.

Al/Sic and Cu/Sic composite material friction pair used for railway vehicle and manufacturing method thereof

Pore gradient silicon carbide porous ceramic and preparation method thereof

Method for preparing recrystallized silicon carbide porous ceramic by combining carbothermic reduction

The invention relates to a microporous graphite silicon carbide brick and belongs to the field of refractory material for iron making blast furnace. The microporous graphite silicon carbide brick is prepared from main raw materials of SiC, Si, Ti and pyrolytic graphite and a binder of modified phenol-formaldehyde resin through steps of pugging, die vibration forming, low temperature baking, immersion and high temperature sintering. The brick has excellent thermal conductivity, alkali resistance, inoxidizability, slag erosiveness, small average aperture and apertures with an aperture larger than 1 mum having a volume no more than 4%, and suits for bosh, belly, middle and lower part of a large blast furnace. Besides, the brick has a long service life and substantial economic benefits.

Microporous graphite silicon carbide brick

The invention discloses a method for preparing a compound co-continuous phase SiC/Si composite material. The method includes the steps of firstly performing wet mixing on raw materials of ferric oxide and SiC according to different additive amounts of ferric oxide, and then using a rotary evaporator to dry the mixed raw material; placing PVA into dries powder to perform granulation, sintering after dry pressing to obtain oriented porous ceramics with different porosities; then using the obtained oriented porous SiC ceramics as reinforcements, and preparing compound co-continuous phase SiC/Si composite material through the vacuum impregnation technique. According to the method, oriented porous ceramics prepared by utilizing ferric oxide as pore forming agent is pure SiC ceramics which has the characteristic of structure orientation distribution, excellent high temperature performance and high pore rib density and bending strength, so that the prepared compound co-continuous phase SiC/Si composite material has high pore rib density and bending strength, is greatly superior to the SiC/Si composite material which is prepared by reaction-sintering process and used for armor materials, and has good application prospect.

Method for preparing compound co-continuous phase SiC/Si composite material

The invention discloses a preparation method of a porous silicon-carbide ceramic provided with oriented pores. Firstly, according to weight percentage, 0 to 30 percent of carbon powder, 0 to 50 percent of silicon powder and 0 to 60 percent of silica are added into the 10 to 100 percent of the basic material of silicon-carbide; wherein, the granularity of the silicon-carbide is W3.5 to P220, and one granularity or two granularities are adopted for graduation; then the equally mixed materials are processed through powder accumulation or normal ceramic forming process to obtain a green compact which is put into a graphite crucible or a saggar; the graphite crucible or saggar is placed into a vacuum sintering furnace provided with a temperature field with a temperature grade from 15 to 30 DEG C/cm, and then the temperature is raised to 1900 to 2500 DEG C in an argon environment and with pressure of 0.2 to 1 multipliedby 10 Pa, and the insulation work for the graphite crucible or saggar is preserved for 0.5 to 3 hours; finally the temperature naturally falls down under air protection and the sintered body is taken out, namely, the recrystallization porous silicon-carbide ceramic provided with oriented pores is obtained.

Jiqiang Gao

Papers

Preparation of oriented hole silicon carbide porous ceramic