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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摘要分别添加硬脂酸(SA)、油酸(OA)、γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)和γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)等4种表面活性剂对Mg₂TiO₄粉末进行改性,通过红外分析和粒度测试,研究表面活性剂对Mg₂TiO₄粉末粒径分布的影响和作用机理。并用改性前后的Mg₂TiO₄粉末制备装载量(体积分数)为44%的注射成形喂料,通过表征粉末喂料的黏度、最大装载量φ_max、流变激活能和屈服应力来研究不同改性剂对喂料流变性能的影响。结果表明：表面活性剂通过化学吸附与Mg₂TiO₄粉末相接,可有效减少粉末团聚。用OA对Mg₂TiO₄粉末进行改性可使喂料黏度从39.55 Pa·s显著下降到5.43 Pa·s(剪切速率为100 s^-1),激活能从62 kJ/mol下降到38 kJ/mol,并且在170 ℃得到最低的屈服应力12 Pa (改性前为1 832 kPa)。用KH560改性的喂料φ_max最大,为135%。

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	石原
	刘绍军

关键词 ： Mg₂TiO₄, 微波陶瓷, 注射成形, 流变学, 表面改性, 偶联剂, 脂肪酸

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

收稿日期: 2021-03-16 出版日期: 2021-11-10

ZTFLH:

TB321

通讯作者: 刘绍军,教授,博士。电话：13974953502;E-mail: liumatthew@csu.edu.cn

引用本文:

石原, 刘绍军. 表面活性剂对Mg₂TiO₄微波陶瓷注射成形喂料流变性能的影响[J]. 粉末冶金材料科学与工程, 2021, 26(5): 442-450.
SHI Yuan, LIU Shaojun. Effect of surface modifier on the rheological properties of Mg₂TiO₄microwave ceramics injection molding feedstock. Materials Science and Engineering of Powder Metallurgy, 2021, 26(5): 442-450.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I5/442

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