电介质陶瓷材料辅助微波烧结金属铁粉压坯的试验研究  

Research on the Dielectric Ceramic Material Assisted Microwave Sintering Metal Iron

作　　者：陈文革[1] 辛菲[1] 吴丹[1] 田小玲[1] 

机构地区：[1]西安理工大学材料科学与工程学院,中国西安710048

出　　处：《粉末冶金技术》2015年第2期89-94,104,共7页Powder Metallurgy Technology

基　　金：西安市技术转移促进工程(CXY1430(8));西安市城建委基金

摘　　要：本文用氧化铝、碳化硅、氧化锆三种不同粒度的介质材料作为辅助材料,采用1 150℃、1 050℃两种烧结温度对铁基压坯材料进行微波烧结,获得不同物理性能、微观特征的铁坯,探讨不同介质材料对微波烧结的作用机理。结果表明,介质陶瓷材料对微波烧结金属铁基压坯有促进作用,其组织致密性、硬度明显高于无介质辅助加热。其辅助加热的作用是通过介质材料在微波加热过程中,由于存在介质损耗,介质分子间互相产生摩擦,引起介质温度升高,使介质材料内部、外部几乎同时加热升温,形成体热源状态,缩短了热传导时间,且物料内外加热均匀一致。介质材料影响由大到小依次是碳化硅、氧化锆和氧化铝,而粒度则影响不大。The microwave assisted sintering of the metal iron compaction was studied at temperature 1 150 ℃ and 1 050℃by using different particle size dielectric materials, such as alumina, silicon carbide, zirconium oxide. The different physical properties and microscopic characteristics of sintered iron were analyzed, as well as the effect of different dielectric materials on the microwave sintering mechanism was discussed. The results show that the dielectric ceramic materials have a promoting effect on assisted microwave sintered metal iron base compaction. The structure compactness and hardness of compaction are significantly higher than that without auxiliary heating medium. During the microwave sintering, the dielectric molecule temperature increases due to dielectric loss and molecule friction. So inside and outside of the dielectric material are heated up uniformly almost at the same time, greatly shortening the heating time. The effect order of dielectric materials are silicon carbide, zirconium oxide and alumina. The particle size of dielectric materials has a few influence.

关 键 词：微波烧结 介质材料 作用机理 铁基粉末冶金 

分 类 号：TQ174.758[化学工程—陶瓷工业]