Ceramic Processing Through Colloid Chemical Technique

通过胶体化学技术进行陶瓷加工

• 批准号: 63550586
• 负责人: KIMURA Toshio
• 金额: $ 1.22万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550586/
• 关键词: Suspension; Alumina; Composites; Dispersion of Powders; Slip-casting; Green Compact Structure; Rheology; Heterocoaguration; ζ電位; テープ成形; 焼結挙動

This report deals with the effects of pH value and salt concentration on the dispersion of powders in alumina, alumina-silica and alumina-zirconia aqueous suspensions and the structure of green compacts made by slip- casting of the suspensions.1. The sispersion of alumina particles depended on pH and salt concentration. The green compacts made from well-dispersed suspensions had high density, small pore-size and good sinterability.2. Strong interaction between alumina and silica particles was caused by heterocoaguration in the suspensions of pH between 3 and 8, and prevented separation of alumina and silica particles, although the green compacts had low densities. Composite particles, in which alumina particles were coated by silica particles, were formed in the suspension with pH = 2. Green compact with highly homogeneous component distribution and high density was obtained because of good-dispersibility of the composite particles.3. Alumina and zirconia particles separated in the green coripacts made from well-dispersed suspensions. The suspensions with pH larger than 7 gave green compacts with better homogeneity than those with low pH, but the compacts were composed of agglomerates of each component. The suitable amounts of salt in the suspension with pH = 4.5 resulted in the formation of network structure between zirconia particles, which prevented sedimentation of alumina particles, leading to the formation of homogeneous green compacts.

本报告讨论了pH值和盐浓度对粉末在氧化铝、氧化铝-二氧化硅和氧化铝-氧化锆水悬浮液中分散的影响以及通过悬浮液注浆成型制备的生坯结构的影响。1．氧化铝颗粒的分散取决于pH值和盐浓度。由分散良好的悬浮液制成的压坯密度高、孔径小、烧结性好。 2．尽管生坯密度较低，但 pH 值为 3 至 8 的悬浮液中的异质凝结引起了氧化铝和二氧化硅颗粒之间的强烈相互作用，并且阻止了氧化铝和二氧化硅颗粒的分离。在pH=2的悬浮液中形成二氧化硅颗粒包覆氧化铝颗粒的复合颗粒，由于复合颗粒分散性好，得到的压坯成分分布高度均匀，密度较高。 3．氧化铝和氧化锆颗粒在由分散良好的悬浮液制成的绿色颗粒中分离。 pH值大于7的悬浮液比pH值低的悬浮液得到的生坯具有更好的均匀性，但压坯由各组分的团聚体组成。 pH = 4.5 的悬浮液中适量的盐导致氧化锆颗粒之间形成网络结构，从而防止氧化铝颗粒沉降，从而形成均匀的生坯。

项目成果

T. Kimura: "Effect of Agglomerate Structure on the Green Compacts made by Slip Casting of Alumina-Zirconia Suspensions" J. Am. Ceram. Soc.

T. Kimura：“团聚结构对氧化铝-氧化锆悬浮液注浆成型生坯的影响”J. Am。

T.Kimura: "Effect of Particle Agglomeration on the Properties of Al_2O_3ーSiO_2 Suspensions" J.Mater.Sci.

T.Kimura：“颗粒团聚对 Al_2O_3ーSiO_2 悬浮液性能的影响”J.Mater.Sci。

S. Inada: "Effect of Green Compact Structure on the Sintering of Alumina" Ceram. Int.

S. Inada：“绿色致密结构对氧化铝烧结的影响”陶瓷。

S.Inada: "Effect of Green Compact Structure on the Sintering of Alumina" Ceram.Int.

S.Inada：“绿色致密结构对氧化铝烧结的影响”Ceram.Int。

T.Kimura: "Effect of Agglomeration Structure on the Green Compacts made by Slip Casting of Al_2O_3-ZrO_2 Suspensions" J.Am.Ceram.Soc.,.

T.Kimura：“团聚结构对 Al_2O_3-ZrO_2 悬浮液注浆成型生坯的影响”J.Am.Ceram.Soc.，。