Papers by Keyword: Sintering Parameters

Abstract: In this work, Copper-Titanium Aluminium Carbide (MAX Phase) – Graphene Composites of desired sizes were prepared by mechanical alloying and Powder Metallurgy route. Sintering was carried out at different temperatures and times and the effect of these sintering parameters on the microstructure of the developed composite and the mechanical and electrical properties were investigated. The microscopic examination reveals that increase in sintering temperature resulted in a properly bonded composite structure. The increase in sintering temperature and time increases the hardness and the wear resistance of the developed composite. Though the density and electrical conductivity shows an increasing trend initially, with higher Sintering temperature, a slight decrease is observed because of the presence of voids in the structure.

Abstract: During selective laser sintering process, different sintering parameters have great impact on the performance of the molded parts, and the degree of influence is different. Using orthogonal test, indirect sintered 316L stainless steel, the compressive strength and precision of the parts were measured and compared to study the influence of various sintering parameters (laser power, scanning speed, scan spacing, preheating temperature) on sintering. The greater degree of influence factors were got by range analysis. The results show that laser power, scanning speed and scan spacing have greater degree of influence on the compressive strength of the parts, and the preheating temperature have less impact. By comparison, the optimum set of parameters was concluded: the laser power is 15W, the scanning speed is 1900mm/s, the scan spacing is 0.125mm, and the preheating temperature is 60°C.

Abstract: Sintering temperature influences on sintering process essentially. Laser power and scanning speed determined sintering temperature. Preheat to powder is beneficial to improve the surface temperature uniformity. Stress concentration of part is various in different layer depth. Therefore, the influence of laser power, scanning speed, thickness of spreading layer and preheat temperature on part quality in selective laser sintering(SLS) are main factors. Based on laser energy in Gaussian distribution and mechanism of SLS, with manufactured specimen pieces by molding machine AFS-450, orthogonal experimental design and analysis of variance are adopted to post-treatment. The prototyping sintering parameters are optimized. The result and solution of the experiment are the preheat temperature of 100°C, the scanning speed of 2000 mm/s, the laser power of 24W, the thickness of single layer of 0.2mm for ABS resin. This work can provide optimized parameters in SLS for ABS resin. It will be of benefit to improve the part dimensional precision and strength.