Fluidization limit and slip structure in aqueous concentrated slurry containing hydrophobic hetero-particles in the presence of polymer-dispersant

聚合物分散剂存在下含有疏水杂颗粒的水性浓缩浆料的流化极限和滑移结构

基本信息

批准号：
11450334
负责人：
HASHIBA Minoru
金额：
$ 9.41万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The SiC powders were pre-heated to evaluate the effect of the amount of free carbon and oxygen content on the surface of the SiC particles on the fluidity of the SiC slurries and the sintered density. Heating of the SiC powders at over 300℃ enhances the fluidity of the SiC slurries. The fluidity of C slurries was effectively enhanced by the addition of ammonium 2-naphthalene sulfonate formaldehyde condensate ( DEMOL-AS ) solution, compared with the addition of styrene/maleic copolymer ( SM ) solution with tetramethyl ammonium hydroxide ( TMAOH ) at pH 10-1 1. The SiC slurries with C and B_4C as sintering aids were prepared by controlling a pH of 10-11 with TMAOH and adding the optimum amount ofDEMOL-AS or SM to C content and then slip casting was conducted. The sintered body containing the SiC powders pre-heated at any temperatures was achieved the higher density of about 98 % Th. D. The SiC body of higher sintered density was possible to fabricate by controlling the addition of carbon, taking into account oxygen content on the surface of the SiC particles and the amount of free carbon.Zirconium acetate effectively enhanced the dispersion and fluidity of SiC slurries in the weakly acidic pH range. The optimum pH valuetod concentration of Zr-A for the SiC slurries were pH 3.5 and 0.5-1 wt % of the SiC, respectively. In aqueous media, Zr-A became a positively charged species. The SiC particles also exhibited a positively charged state at pH 3.5. Thus, the role of Zr-A in the dispersion of slurries should be interpreted as that of a depletion-stabilization mechanism.

SIC粉末已预热，以评估SIC颗粒表面的游离碳和氧含量对SIC浆液的流动性和烧结密度的影响。 SIC粉末在300多个以上的加热可增强SIC浆液的流动性。 The fluidity of C slurries was effectively enhanced by the addition of ammonium 2-naphthalene sulfonate formaldehyde condensate ( DEMOL-AS ) solution, compared with the addition of styrene/maleic copolymer ( SM ) solution with tetramethyl ammonium hydroxide ( TMAOH ) at pH 10-1 1. The SiC slurries with C and B_4C as sintering aids were prepared by controlling a pH of 10-11用TMAOH并将最佳的Demol-AS或SM添加到C含量中，然后进行滑动铸件。在任何温度下预热的SIC粉末的烧结物体的密度较高，约为98％。 D.考虑到SIC颗粒表面上的氧含量以及乙酸锌的含量，可以通过控制碳的含量来有效提高弱酸性pH范围内的SIC浆液的分散体和流动性。 SIC浆液中ZR-A的最佳pH值浓度分别为SIC的pH 3.5和0.5-1 wt％。在水性培养基中，ZR-A成为了一个带正电荷的物种。 SIC颗粒在pH 3.5处也表现出带正电荷的状态。这就是ZR-A在浆液分散中的作用，应解释为部署稳定机制的作用。