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Research on Design of Sol-Gel Reaction for Creating Ceramic Composites

陶瓷复合材料溶胶-凝胶反应设计研究

基本信息

批准号：
01470072
负责人：
KAMIYA Kanichi
金额：
$ 2.94万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470072/
关键词：
Sol-gel method Ceramic composites organic inorganic hybrids Carbon-containing SiO_2 glass SiO_2 glass fibers TiN-coating Antioxidation coating Ceramic fibers 複合体有機@無機複合体ジルコニア繊維

项目摘要

The world-wide research has been conducted on the ceramic composite which should be important new materials in coming 21st century. The aim of the present research was to inquire the Potentiality of the sol-gel method in fabricating those composite. The sol-gel method can provide us with new combinations of materials which are not accessible in the conventional techniques, since this makes possible to produce ceramics at relatively low processing temperatures. Following is the summary of research results.1. The organic/inorganic hybrid materials with elasticity was made from CH_3Si(OC_2H_5)_3 through the sol-gel reaction.2. The hybrid led to the SiO_2 glass containing a large amount of isolated carbon particles which could not be obtained by conventional method. On heating the hybrid, 4-fold SiO_4 ring structure was converted to more open ring structure to give SiO_2 glass.3. The dispersion of colloidal SiO_2 particles in the SiO_2 gel fibers suppressed the formation of microcracks in the fibers during heating, resulting in the strengthening of the sol-gel derived SiO_2 glass fibers by a factor of 1.5.4. SiC whisker/mullite composite with high density was produced, where monolithic gel of 2Al_2O_3.SiO_2 composition containing SiC whisker and a small amount of crystalline mullite fine particles was successfully converted to the composite only by heating in air.5. TiN coating (anti-abrasion), SiO_2-TiO_2 coating (anti-oxidation) were applied to graphite materials.6. Several kinds of ceramic fibers such as ZrO_2, PbTiO_3 and BaTiO_3 were prepared by the sol-gel process.Above results indicate the potentiality of sol-gel method in creating new ceramic composites, although 1-6 have still some problems to be overcome.

陶瓷基复合材料是21世纪世纪的重要新材料，世界范围内对它的研究正在进行。本研究的目的是探讨溶胶-凝胶法在制备这些复合材料的潜力。溶胶-凝胶法可以为我们提供传统技术无法获得的新材料组合，因为这使得在相对较低的加工温度下生产陶瓷成为可能。以下是研究结果的总结.以CH_3Si（OC_2H_5）_3为原料，通过溶胶-凝胶法制备了具有弹性的有机/无机杂化材料.这种杂化导致了SiO_2玻璃中含有大量的孤立碳颗粒，这是常规方法所不能得到的。在加热过程中，4重SiO_4环结构转变为更开环的SiO_2结构，得到SiO_2玻璃. SiO_2胶体粒子在SiO_2凝胶纤维中的分散抑制了纤维在加热过程中微裂纹的形成，使溶胶-凝胶法制备的SiO_2玻璃纤维的强度提高了1.5.4倍。通过在空气中加热将含有SiC晶须和少量莫来石细颗粒的2Al_2O_3.SiO_2组成的整体凝胶转化为高致密度的SiC晶须/莫来石复合材料.对石墨材料进行了TiN涂层（耐磨）、SiO_2-TiO_2涂层（抗氧化）的研究.用溶胶-凝胶法制备了ZrO_2、PbTiO_3和BaTiO_3等几种陶瓷纤维，这些结果表明溶胶-凝胶法在制备新型陶瓷复合材料方面具有很大的潜力，但1-6号仍有一些问题需要解决。