预混液成分对光固化成形氮化硅陶瓷力学性能的影响

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摘要以1,6-已二醇二丙烯酸酯(HDDA)、丙烯酸-2羟乙酯(HEA)和三甲基丙烷三丙烯酸酯(TMPTA)等3种稀释剂和环氧丙烯酸酯(EA)、水性聚氨酯丙烯酸酯(PUA)、改性丙烯酸酯(WUV)及脂肪族环氧丙烯酸酯(APU)等4种预聚物为原料,加入用硅烷偶联剂KH560表面改性后的Si₃N₄陶瓷粉末制成Si₃N₄陶瓷浆料,经过光固化成形、脱脂和烧结后,得到Si₃N₄陶瓷。研究稀释剂的配比、预聚物种类以及固相含量φ(Si₃N₄)对陶瓷浆料流变性能的影响,确定合适的烧结温度,测定Si₃N₄陶瓷的力学性能。结果表明,将HDDA、HEA和TMPTA三者按3:1:6的质量比混合作为稀释剂,与预聚物EA制成的预混液,相对分子质量和黏度最低;φ(Si₃N₄)为45%的浆料光固化成形的坯体结构致密,在160℃脱脂后,未出现孔洞、裂纹等缺陷,在1750℃,压力为5MPa条件下烧结后,所得Si₃N₄陶瓷的显微硬度(HV)和断裂韧性分别达到14.57GPa和5.78MPa·m^1/2。

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	刘耀
	何宇
	辛峰
	王斌
	占丽娜
	文如泉
	肖文福
	刘绍军

关键词 ：光固化, 氮化硅(Si₃N₄), 预混液, 稳定性, 流变性, 力学性能

Abstract：Using three diluents of 1,6-hexanediol diacrylate (HDDA), 2-hydroxyethyl acrylate (HEA) and trimethylpropane triacrylate (TMPTA), and four kinds of prepolymers of epoxy acrylate (EA), water-based polyurethane acrylate (PUA), modified acrylate (WUV) and aliphatic epoxy acrylate (APU) as raw materials, Si₃N₄ ceramic powder modified by silane coupling agent KH560 is added to prepare Si₃N₄ ceramic slurry. Si₃N₄ ceramics were prepared by light curing, debinding and sintering. The effects of diluent ratio, prepolymer type and solid content (i.e. the volume fraction of Si₃N₄) on the rheological properties of ceramic slurry were studied. The appropriate sintering temperature was determined and the mechanical properties of Si₃N₄ ceramics were measured. The results show that when HDDA, HEA and TMPTA are mixed in a mass ratio of 3:1:6 as the diluent, the premixed liquid made with prepolymer EA has the lowest relative molecular mass and viscosity. The light cured green body with 45% solid phase content is compact, and there are no holes and cracks after debinding at 160 ℃. The microhardness and fracture toughness of Si₃N₄ ceramics sintered at 1 750 ℃ and 5 MPa are 14.57 GPa and 5.78 MPa·m^1/2 respectively.

Key words： stereolithography Si₃N₄ premix stability rheological mechanical property

收稿日期: 2020-06-30 出版日期: 2021-01-18

ZTFLH:

TF12

基金资助:江西省教育厅科学计划资助项目(GJJ181102)

通讯作者: 占丽娜,讲师,硕士。电话：15279931997;E-mail: 24599437@qq.com

引用本文:

刘耀, 何宇, 辛峰, 王斌, 占丽娜, 文如泉, 肖文福, 刘绍军. 预混液成分对光固化成形氮化硅陶瓷力学性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(5): 417-423.
LIU Yao, HE Yu, XIN Feng, WANG Bin, ZHAN Lina, WEN Ruquan, XIAO Wenfu, LIU Shaojun. Effect of premix ratio on mechanical properties of silicon nitride ceramics prepared by stereolithography. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 417-423.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I5/417

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