In order to reduce the thermal stress, we choose the ceramic particles preform of hexagon. According to actual demand, the ceramic particles are prepared into a preform with a special structure and size, and then the preform is closely combined with the molten metal to prepare a ZTA P/HCCI composite. One of the remarkable characteristics of composite materials is their designability. The composite layer is prepared by the infiltration method in HCCI/ZTA P composite. In HCCI/ZTA P composites, the composite layer is designed as the working face and the rest matrix is metal, which makes the composite to have high wear resistance and plasticity at the same time. Therefore, in order to further improve the performance of HCCI/ZTA P composites, it is important to study and reduce their cracking tendency. When the molten metal infiltrates into the aggregated particles, the temperature decreases, resulting in a poor combination ability of metal with ceramic particles. HCCI/ZTA P composites materials also have the above problems. The continuous extension and propagation of cracks may eventually lead to the fracture of the composite material or even the entire layer peeling off. ![]() When the thermal stress is high, cracks may be initiated inside the composite, especially at the interface between the ceramic particles and the metal. If the difference of the thermal expansion coefficient between ceramic particles and metal is too large, the thermal stress in composites will increase accordingly. Excellent plasticity and lower thermal stress can reduce the possibility of cracking of composite materials. The cracking of composite materials is related to the plasticity and stress condition. HCCI/ZTA P composites still have some cracking tendency, which may affect the appearance and stability of the production. Ceramic particles reinforced metal matrix composites, such as high chromium cast iron (HCCI) matrix composites reinforced by zirconia toughened alumina (ZTA) ceramic particles (referred as HCCI/ZTA P composites hereinafter), are one of the most popular wear-resistant materials, which perfectly combines the high hardness of ZTA ceramic with the outstanding toughness of HCCI and makes full use of the complementary relationship between the two, giving the excellent wear resistance to metal matrix composites. With the continuous advancement of the industrialization process, traditional single wear-resistant materials have gradually become difficult to meet the performance requirements of wear-resistant parts in the fields of metallurgy, electric power, and building materials. The results show that adding 10-mm round holes on the preform can improve the performance of the composite, which is helpful to prevent the cracks and increases the plasticity of the material. Thermal stress in solidification process and compression stress distribution are obtained. ![]() The solidification process of composite material is simulated, and the infiltration between molten iron and ceramic particles is realized. In this work, the equivalent grain models are used to describe the actual preform, making the simulation results closer to the actual experimental results. The previous model simplifies the overall structure of the ceramic particle preform and adds boundary conditions to simulate the particles, which will cause uncontrollable error in the results. In order to reduce the thermal stress in high chromium cast iron (HCCI) matrix composites reinforced by zirconia toughened alumina (ZTA) ceramic particles, finite element simulation is performed to optimize the geometric configuration of ceramics perform.
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