人工晶体学报
人工晶體學報
인공정체학보
2008年
4期
800-804
,共5页
透明陶瓷%机械性能%非化学配比%显微结构
透明陶瓷%機械性能%非化學配比%顯微結構
투명도자%궤계성능%비화학배비%현미결구
transparent ceramics%mechanical property%non-stoichiometry%microstructure
用化学配比n为1.0,1.3,1.5和1.8的MgO·nAl2O3粉体分别制备出了镁铝尖晶石透明陶瓷MA1.0,MA1.3,MA1.5和MA1.8.这些陶瓷是通过真空烧结和热等静压两步烧结方法制得的.由于第二相物质氧化铝晶粒的析出,陶瓷相对密度随着化学配比的增高而降低.然而,与化学配比陶瓷相比,这些非化学配比陶瓷表现出了较高的机械性能,陶瓷断面的扫描电镜照片显示非化学配比陶瓷多为穿晶断裂模式,这种断裂模式对陶瓷的强韧化作出了主要贡献.
用化學配比n為1.0,1.3,1.5和1.8的MgO·nAl2O3粉體分彆製備齣瞭鎂鋁尖晶石透明陶瓷MA1.0,MA1.3,MA1.5和MA1.8.這些陶瓷是通過真空燒結和熱等靜壓兩步燒結方法製得的.由于第二相物質氧化鋁晶粒的析齣,陶瓷相對密度隨著化學配比的增高而降低.然而,與化學配比陶瓷相比,這些非化學配比陶瓷錶現齣瞭較高的機械性能,陶瓷斷麵的掃描電鏡照片顯示非化學配比陶瓷多為穿晶斷裂模式,這種斷裂模式對陶瓷的彊韌化作齣瞭主要貢獻.
용화학배비n위1.0,1.3,1.5화1.8적MgO·nAl2O3분체분별제비출료미려첨정석투명도자MA1.0,MA1.3,MA1.5화MA1.8.저사도자시통과진공소결화열등정압량보소결방법제득적.유우제이상물질양화려정립적석출,도자상대밀도수착화학배비적증고이강저.연이,여화학배비도자상비,저사비화학배비도자표현출료교고적궤계성능,도자단면적소묘전경조편현시비화학배비도자다위천정단렬모식,저충단렬모식대도자적강인화작출료주요공헌.
Transparent Mg-Al spinel ceramics MA1. 0, MA1.3, MA1.5 and MA1.8 was fabricated from MgO · nAl2O3 powder with n of 1. 0, 1.3, 1.5 and 1.8, respectively. These ceramics were sintered to be transparent through two combined sintering processes, i.e. vacuum sintering followed by hot isostatic pressing (HIP). Relative density of these ceramics decreases with n in MgO · nAl2O3 increasing because of second phase Al2O3 grains appearing in non-stoichiometric ceramics MA1.3, MA1.5 and MA1.8 during preparation. However, these non-stoichiometric ceramics show higher mechanical properties than ceramic MA1. 0. Fractural surfaces of non-stoichiometric ceramics observed by scanning electron microscopy (SEM) are featured with more transgranular fracture which contributes to improving their mechanical properties.
