Mixed regulation model of ceramic particles with molten high-chromium iron KmTBCr26

摘要

Particle reinforced metal matrix composites have many problems such as complicated preparationprocess, high production costs, weak interface bonding between the ceramic and metal matrix, unevendistribution of ceramic particles and so on. To solve these problems, the method of "shoot mixing + pressurecompositing" (SM-PC) and a mixed regulation model of ceramic particles with molten steel were proposed. Inthe shoot mixing process, the special designed die casting equipment was used to make the particles with themolten metal mixed in the runner at a certain ejection speed (150 mm·s-1). After the mixture is filled with themold, the pressure is maintained until the end of solidification. In order to optimize this method to obtain the moreuniform particle distribution, the parameters (ejection speed, preheating temperature of particles, the shape andsize of runner) in the model were selected for sample preparation. Taking the distribution index of particles as theevaluation criterion, it is concluded that the uniform distribution of particles can be promoted with the increase ofejection velocity, the increase of particle preheating temperature, and the small change of gate size. When thepreheating temperature of particles was 1,100 °C, and the shape of the runner was trumpet, the optimal particledistribution composite parts was obtained. Meanwhile, the particles and the matrix achieved strong interfacebonding - "Class I interface " under the pressure compositing, even though they're non-wetting.