摘要
通过激光选区烧结(SLS)技术成形了堇青石/碳纤维复合材料初胚,经高温烧结获得了陶瓷试样,研究了陶瓷试样的孔隙率、力学性能和尺寸精度在不同工艺下的变化。结果表明,碳纤维通过烧结颈粘结穿插在堇青石基体中,随着烧结温度的升高,堇青石熔化变形,孔隙率减小。当烧结温度为1350~1400℃时,堇青石为μ相,当烧结温度升高至1425℃时,堇青石由μ相向α相转变。碳纤维有效增强了初胚的韧性和强度,随着烧结温度的升高,陶瓷试样的抗压强度不断增大,并在1425℃时达到最大值5.48MPa。
The green parts of cordierite/carbon-fiber composites are fabricated by the selective laser sintering technique and then the final porous ceramic parts are obtained by high-temperature sintering.The changes of porosity,mechanical performance and dimensional accuracy under different processes are investigated.The results show that the carbon fibers are bonded into the matrix by bonding necks and with the increase of sintering temperature,the cordierite melts and deforms,which leads to the reduction of porosity.When the sintering temperature is 1350-1400℃,the μ-cordierite is stable.In contrast,when the sintering temperature increases to 1425℃,the μ-cordierite is transformed into the α-cordierite.Moreover,the carbon fibers effectively enhance the toughness and strength of the green parts and with the increase of sintering temperature,the compressive strength of ceramic parts increases until to its maximum value of 5.48 MPa at 1425℃.
作者
朱学超
唐萍
杨益
魏青松
Zhu Xuechao;Tang Ping;Yang Yi;Wei Qingsong(School of Mechanic &Electronic Engineering,Suzhou Vocational University,Suzhou,Jiangsu 215104,China;State Key Laboratory of Materials Processing and Die &Mould Technology,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2018年第12期341-347,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(51775207)
民机专项(MJ-2015-H-G-104)
关键词
激光技术
激光选区烧结
堇青石
碳纤维
复合材料
多孔陶瓷
laser technique
selective laser sintering
cordierite
carbon fiber
composites
porous ceramic