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首页> 外文期刊>Journal of Materials Research >Water-based Si_3N_4. suspensions: Part II. Effect of wet mixing/milling processes on the addition of the sintering aids
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Water-based Si_3N_4. suspensions: Part II. Effect of wet mixing/milling processes on the addition of the sintering aids

机译：水性Si_3N_4。悬架：第二部分。湿法混合/研磨工艺对添加烧结助剂的影响

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摘要

Three mixing processes were used to introduce lanthanum oxide and yttrium oxide in silicon nitride suspensions. X-ray photoelectron spectroscopy (XPS) analysis was used to identify the surface composition and investigate the surface coverage by the added oxides. XPS results evidenced the protective effect against hydrolysis and oxidation of the coated layer. Electroacoustic measurements showed that the milling/mixing process and solids loading contents had a great influence on the isoelectric point (IEP) and on the dispersing degree for suspensions with sintering aids. With the change of solids load content and mixing energy, the IEP of mixed powders suspensions reflected a surface behavior dominated by the additives oxides. The attrition mixing and the ultrasonication resulted in the more efficient processing routes to distribute the sintering aids on the starting Si_3N_4 powders, especially at high solids volume fraction.
机译：三种混合工艺用于在氮化硅悬浮液中引入氧化镧和氧化钇。使用X射线光电子能谱（XPS）分析来识别表面成分，并研究所添加氧化物的表面覆盖率。 XPS结果证明了对涂层的水解和氧化的保护作用。电声测量表明，研磨/混合过程和固体负载量对带有烧结助剂的悬浮液的等电点（IEP）和分散度有很大影响。随着固含量和混合能的变化，混合粉末悬浮液的IEP反映出以添加剂氧化物为主的表面行为。磨损混合和超声处理导致更有效的加工路线，以将烧结助剂分配到起始的Si_3N_4粉末上，特别是在高固体含量的情况下。

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