สมบัติทางกลและทางความร้อนของซิลิคอนคาร์ไบด์พรุนและวัสดุผสมเนื้ออะลูมิเนียมเสริมแรงด้วยซิลิคอนคาร์ไบด์ที่สังเคราะห์จากไม้ยางพารา

Abstract

The purpose of this research is to study processing and testing of aluminum matrix composites reinforced with silicon carbide from rubber wood. Biomorphic Sic was synthesized from natural rubber wood. In this study it can be divided into 2 processes. Firstly (i), the process of producing the aluminum -silicon carbide composites. This process was composed of 4 steps. The first step is carbonization process. The rubber wood was pyrolyzed to produce porous carbon. In the second step, porous carbon was coated with silica from sol-gel process. The result of this process was C/SiO3 composite material. In the third step, The reaction of carbothermal reduction was implemented at temperatures up to 1600 °C under Ar-atmosphere. The result of this process was a porous silicon carbide/carbon. In the last step, squeeze casting method was implemented by infiltrated molten aluminum into the porosity of biomorphic Silicon carbide/carbon. For squeeze casting process, casting factor alignment as axial sample or radial samples was set to be different testing condition to the infiltration of aluminum into porous carbon. Secondly (ii), the testing of aluminum-SiC composites was studied by physically analyzing, electrical properties, thermal conductivity properties, mechanical properties and ANOVA . The results shown that the aluminum -Sic composites contains carbon 49.13%, aluminum 36.94% and silicon 8.21% respectively. The result electrical properties and thermal conductivity properties shown that the result of electrical property and thermal conductivity shown that the composite in radial sample evidences electrical property and thermal conductivity better than axial sample. The results of mechanical properties are comprised of wear and hardness testing indicated that the composite in Radial sample exhibits better wear resistance than axial sample. Moreover, it can be found from holding time factor that hardness of Radial sample was decreased when increasing the holding time. Lastly, hardness testing value was analyzed by analysis of variance and found that sample direction was greatly affected to the hardness confidence level (a = 0.05).