粉体表面改性对氧化锆光固化成形的影响

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Abstract The surface of ZrO₂ powder was modified by MAA, 3-(isobutyryloxy) propyltrimethoxysilane (γ-MPS) and stearic acid (SA), and then the stereolithography slurry was prepared. By means of infrared spectrum, particle size analysis, sedimentation experiment and rheological test, the effect and mechanism of modifier on particle size distribution, stability and viscosity of slurry were studied. The results show that the modifier exists on the surface of ZrO₂ powder in the form of chemical adsorption, which can effectively reduce the agglomeration of powder. The surface modification of ZrO₂ powder can improve the stability and reduce the viscosity of the stereolithography slurry. Adding 0.5%MAA (mass fraction) has the best modification effect. The viscosity of the slurry decreases from 156.2 Pa·s to 47.1 Pa·s at the shear rate of 1 s^-1. ZrO₂ green bodies are formed via stereolithography with slurry of 75% solid content and sintered at 1 500 ℃ for 3 h. ZrO₂ ceramics with density of 6.02 g/cm³ and hardness (HV₁₀) of 1 290 are obtained.

Key words： stereolithography zirconia surface modification viscosity cure depth

Received: 26 November 2019 Published: 19 June 2020

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	LI Qing
	LIU Yao
	CAI Weijin
	SHI Yuan
	LIU Shaojun

Cite this article:

LI Qing,LIU Yao,CAI Weijin, et al. Effect of powder surface modification on the stereolithography of zirconia[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 140-147.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/140

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