摘要
研究了MgO,Al2O3和Y2O3作为烧结助剂对高温自蔓延工艺合成(SHS)的β-Si3N4粉料烧结过程的影响.结果发现,MgO是较为有效的烧结助剂,当其加入量为10wt％时,试样在1600℃下热压烧结能基本实现致密化.对试样的XRD分析表明,除了加入的Al2O3与β—Si3N4反应生成β-Sialon外,其他烧结助剂都不与β-Si3N4反应,只存在于玻璃相中.添加MgO的试样具有较高的力学性能.最后,对材料的显微形貌进行了SEM观察.
The sintering of β-Si3N4 powder synthesized by self-propagating high-temperature synthesis was studied with the addition of MgO, Al2O3, Y2O3 as sintering additives. MgO was found to be the effective sintering aids, and β-Si3N4 could be densified at 1600°C under 20 MPa with the addition of 10 wt% MgO. XRD results showed that the additives did not react with β-Si3N4, existing in glassy phase of the sintered sample, with the exception of Al2O3, which reacted with β-Si3N4 to form β-Sialon phase. The samples with MgO added had better mechanical properties than that of samples doped with Y2O3 and Al2O3. The microstructure of sintered samples was observed by SEM.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第6期1431-1435,共5页
Journal of Inorganic Materials
基金
中国科学院海外杰出学者项目
基金委项目(50272073
50140120423)
关键词
高温自蔓延合成(SHS)
Β-SI3N4
烧结过程
烧结助剂
力学性能
Additives
Alumina
Ceramic materials
Magnesia
Mechanical properties
Microstructure
Scanning electron microscopy
Sintering
X ray diffraction analysis
Yttrium compounds
