CAJ | 학술논문

以羟丙基甲基纤维素(HPMC)作为有机塑化剂, 采用挤出成型工艺常压烧结制备碳化硅陶瓷管材, 系统研究了羟丙基甲基纤维素含量对陶瓷管材性能的影响以及不同温度制度下碳化硅陶瓷显微结构变化. 研究结果表明, 陶瓷管材坯体的平均径向抗外压强度随着HPMC含量的增加呈增加趋势, 当HPMC含量为7.5wt%时达462MPa;2200℃保温1h烧结陶瓷管材的致密度随着HPMC含量的改变没有明显的变化. 采用两步烧结法得到的碳化硅管材体积密度从3.00g/cm~3增加到3.07g/cm~3, 平均径向抗外压强度达540MPa, 致密度可达95.9%. 抛光面经化学腐蚀后的显微结构表明碳化硅颗粒出现异常长大, 有部分板状晶粒出现.
이간병기갑기섬유소(HPMC)작위유궤소화제, 채용제출성형공예상압소결제비탄화규도자관재, 계통연구료간병기갑기섬유소함량대도자관재성능적영향이급불동온도제도하탄화규도자현미결구변화. 연구결과표명, 도자관재배체적평균경향항외압강도수착HPMC함량적증가정증가추세, 당HPMC함량위7.5wt%시체462MPa;2200℃보온1h소결도자관재적치밀도수착HPMC함량적개변몰유명현적변화. 채용량보소결법득도적탄화규관재체적밀도종3.00g/cm~3증가도3.07g/cm~3, 평균경향항외압강도체540MPa, 치밀도가체95.9%. 포광면경화학부식후적현미결구표명탄화규과립출현이상장대, 유부분판상정립출현.
Silicon carbide tube was extruded and pressureless-sintered using hydroxypropyl methylcellulose (HPMC) as the main organic plasticizer. The effect of HPMC contents on the properties of the sintered SiC tubes and the microstructure evolution in the different sintering system were systematically studied. The results show that the radial crushing strength of SiC green bodies increases with increasing HPMC content while the average radial crushing strength obtain maximum of 462MPa with 7.5wt% HPMC. The relative density of the SiC tube sintered at 2200℃ and hold for 1h changes little with different content of HPMC obviously. The density of the sintered SiC tube in two-step sintering method increases from 3.00g/cm~3 to 3.07g/cm~3, and the average radial crushing strength and relative density reach 540MPa and 95.9%, respectively. The microstructure of the chemical etched surface indicate the abnormal growth of the SiC particles and the appearance of the plate-like grains.