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论文类型：期刊论文

发表时间：2012-07-01

发表刊物：Zhongguo Jiguang/Chinese Journal of Lasers

收录刊物：EI、PKU、ISTIC、Scopus

卷号：39

期号：7

ISSN号：02587025

摘要：ZrO 2-13%Al 2O 3 (mass fraction) composite ceramic by laser engineered net shaping (LENS) with co-axial powder feeding is investigated on the titanium substrate. The effect of laser power and scanning speed on the macroscopic qualities (weight, height, surface and macrocrack) of ceramic by LENS is discussed, The dense, macrocrack-free ceramic thin-wall has been fabricated, the microstructure of ceramic has been evaluated using optical microscope, the composition distribution and the phase transformation before and after laser processing have been determinated by electro-probe microanalyzer (EPMA) and X-ray diffractometer (XRD). The results indicate that laser power and scanning speed have an important impact on the thickness of single layer and surface of ceramic, so good macroscopic qualities can be obtained by optimization of this two parameters. There may be two different macrocracks of horizontal and vertical by different laser powers and scanning speeds. The dense ceramic with fine dendritic crystal can be formed by the laser processing. Small amount of Al 2O 3 which mainly exists in the grain boundary is benefit to reduce cracks.