Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal composite materials

Structures and Properties of Pistons of SiC Particle Reinforced Aluminum Composite Formed by Centrifugal Casting

Author LiFuQiang
Tutor LiuChangMing
School Chongqing University
Course Materials Processing Engineering
Keywords ZL104/ZL109 alloy Composite piston Centrifugal Casting Microstructure Mechanical properties
Type Master's thesis
Year 2009
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This paper studies the mechanical agitation Preparation of SiC Particles Reinforced ZL104 / ZL109 alloy composite slurry process, composites prepared slurry centrifugal casting forming process, and forming part of the organization, composition and performance the focus of the study. Studies have shown that self-preparation device designed as reasonably practicable, research prepared good mobility particle reinforced aluminum matrix composite slurry, has been the SiC particle segregation in the head, aluminum piston skirt particles, centrifugal casting molded parts complete smooth, compact and excellent performance. In this thesis, including the following research: research weight of 18kg, the volume fraction of 20%, three average particle size of 15μm, 30, 50μm SiC Reinforced ZL104 / ZL109 two matrix alloy composites technology, identified the SiC particles pretreatment process route and reasonable composite material technology. The application of three-dimensional software to design a set of UG molding the piston mold, and machined mold. Piston core is made in a self-designed wooden core box. Depending on the matrix material, we use two casting process prepared particle reinforced composite piston parts. Sample cut from the part line macro organization point of view, ZL104 matrix composite parts (referred to as the process) was divided into the head of the SiC particles enhancement layer, the SiC particles skirt area and obvious holes defects gate District three; ZL109 matrix composite parts (referred to as the process b) no significant particle stratification. A comparative analysis of the two processes under the conditions of parts microstructure structure, mechanical properties. The results showed that: a uniform particle distribution process enhancement layer, no obvious hole defects, more compact organization; process head of the enhancement layer, the percentage of particles above process; both under the process conditions, the sample Brinell hardness of the reinforcing layer In about 70HRB/80HRB, the hardness of the material of the skirt portion of the less SiC particles substantially 50HRB/60HRB, the Brinell hardness of the reinforcing layer is significantly higher than the non-reinforced layer. Centrifugal casting molding piston Part reinforcing layer and the heat treatment process, non-reinforced layer material hardness, wear resistance, and thermal expansion coefficient of the test sample after the heat treatment. The results show that: the hardness of the enhancement layer is generally higher than non-reinforced layer hardness, process two enhancement layer after heat treatment Brinell hardness increased 22% rather than 50% enhancement layer Brinell hardness; process enhancement layer 42% improvement in wear resistance than before the heat treatment; 20 to 300 ° C. The thermal expansion coefficient of 15 × 10-6 · K-1, more than commonly used piston alloy existing level.

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