Selective laser sintering of polymer-coated Al2O3/ZrO2/TiC ceramic powder

被引：0

作者：

白培康

程军

刘斌

机构：

[1] China

[2] Department of Materials Science and Engineering

[3] North University of China

[4] Taiyuan 030051

来源：

Transactions of Nonferrous Metals Society of China | 2005年 / 02期

关键词：

selective laser sintering; polymer-coated Al2O3/ZrO2/TiC ceramic powder; post-treatment process; mechanical properties;

D O I：

暂无

中图分类号：

TQ174 [陶瓷工业];

学科分类号：

0805 ; 080502 ;

摘要：

A type of polymer-coated Al2O3/ZrO2/TiC ceramic powder was prepared. The laser sintering mechanism of polymer-coated Al2O3/ZrO2/TiC powder was investigated by studying the dynamic laser sintering process. It is found that the mechanism is viscous flow when the sintering temperature is between 80 ℃ and 120 ℃, and it is melting/solidification when the temperature is above 120 ℃. The process parameters of selective laser sintering were optimized by using ortho-design method. The results show that the optimal parameters include laser power of 14 W, scanning velocity of 1 400 mm/s, preheating temperature of 50 ℃ and powder depth of 0.15 mm. A two-step post-treatment process is adopted to improve the mechanical properties of laser sintered part, which includes polymer debinding and high temperature sintering. After vacuum sintering for 2 h at 1 650 ℃, the bending strength and fracture toughness of Al2O3/ZrO2/TiC ceramic part reach 358 MPa and 6.9 MPa·m1/2, respectively.

引用

页码：261 / 265

页数：5