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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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

Received: 30 June 2020 Published: 18 January 2021

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	LIU Yao
	HE Yu
	XIN Feng
	WANG Bin
	ZHAN Lina
	WEN Ruquan
	XIAO Wenfu
	LIU Shaojun

Cite this article:

LIU Yao,HE Yu,XIN Feng, et al. Effect of premix ratio on mechanical properties of silicon nitride ceramics prepared by stereolithography[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(5): 417-423.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I5/417

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