表面活性剂对Mg<sub>2</sub>TiO<sub>4</sub>微波陶瓷注射成形喂料流变性能的影响

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Abstract Mg₂TiO₄powders were modified by surfactants of stearic acid (SA), oleic acid (OA), 3-glycidyloxy- propyltrimethoxysilane (KH560) and 3-methacrylate-propyltrimethoxysilane (KH570). The effects of surfactants on the particle size distribution of Mg₂TiO₄ powders and its mechanism were characterized by infrared analysis and particle size measurement. The Mg₂TiO₄powders before and after modification were used to prepared feedstocks with 44% solid load (volunm fraction). The effects of surfactants on the rheological properties, theoretical maximum loading capacity φ_max, activation energy and yield stress of feedstock were studied. The results show that the surfactants are chemisorbed on Mg₂TiO₄ powder, which effectively reduce powder agglomeration. The OA can significantly reduce the viscosity and rheological activation energy of feedstock. The viscosity decreases from 39.55 Pa·s to 5.43 Pa·s (100 s^-1); the activation energy decreases from 62 kJ/mol to 38 kJ/mol (100 s^-1). The lowest yield stress of 12 Pa is obtained at 170 ℃ (1 832 kPa before modification). The maximum solid loading modified with KH560 is 135%.

Key words： Mg₂TiO₄ microwave ceramics injection molding rheology surface modification couple agents fatty acid

Received: 16 March 2021 Published: 10 November 2021

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	SHI Yuan
	LIU Shaojun

Cite this article:

SHI Yuan,LIU Shaojun. Effect of surface modifier on the rheological properties of Mg₂TiO₄microwave ceramics injection molding feedstock[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(5): 442-450.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I5/442

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