CAJ | 학술논문

为获得密度较高的电子陶瓷压坯及制品,将低电压电磁成形引入二氧化钛(TiO_2)陶瓷粉末压制,分析了电压参数对压坯密度及烧结坯微观组织的影响.研究结果表明:TiO_2陶瓷粉末低电压电磁压制在800～1000V范围内成形较好,在此范围内压坯密度随电压增加而增加,烧结后陶瓷制品密度提高,电压越高,密度增幅趋缓;其它放电参数不变的条件下,粉末坯体高径比越大,压坯密度与烧结坯密度越小;但高径比增大,获得高密度制品的最佳放电电压相近;两次压制可以有效提高压坯及烧结坯密度;相比模压成形,电磁压制的TiO_2陶瓷密度较高,烧结制品晶粒尺寸较小.
위획득밀도교고적전자도자압배급제품,장저전압전자성형인입이양화태(TiO_2)도자분말압제,분석료전압삼수대압배밀도급소결배미관조직적영향.연구결과표명:TiO_2도자분말저전압전자압제재800～1000V범위내성형교호,재차범위내압배밀도수전압증가이증가,소결후도자제품밀도제고,전압월고,밀도증폭추완;기타방전삼수불변적조건하,분말배체고경비월대,압배밀도여소결배밀도월소;단고경비증대,획득고밀도제품적최가방전전압상근;량차압제가이유효제고압배급소결배밀도;상비모압성형,전자압제적TiO_2도자밀도교고,소결제품정립척촌교소.
In order to obtain the denser electronic ceramics, low-voltage electromagnetic forming was applied to compact TiO_2 powders. The effects of voltage on the densities of products and microstructures of ceramics have been investigated. The results show that there exists a discharge voltage range(800～1000V)in compaction, during which TiO_2 powder compact can be formed effectively. In the range, the green density and sintered part's density increase with incrasing discharge voltage, then tend to less change. When the other parameters remain constant, the powder part with higher height to radius ratio (h/d) gets lower green density and sintered density. However, the optimal discharge voltage, which is required for different parts with different h/d, is almost the same. Twice compaction is an efficient way to get high density TiO_2 ceramics. In addition, the SEM results show that, the grain size of ceramics compacted by low-voltage electromagnetic compaction is less than that by static compaction under the same sintered condition.