α-Si3N4与γ-Si3N4超高压烧结体的性能对比
Characteristic Comparison of α-Si3N4 and γ-Si3N4 Sintered under Ultra-high Pressure
摘 要
以Y2O3-Al2O3-La2O3体系作烧结助剂,在5.4～5.7 GPa、1 620～1 770 K的高温高压条件下进行了α-Si3N4与γ-Si3N4粉体的烧结,研究了烧结体的相对密度、韦氏硬度和物相组成.结果表明:α-Si3N4、γ-Si3N4在烧结后完全转变为β-Si3N4;在相同烧结条件下,γ-Si3N4烧结体的相对密度、维氏硬度比α-Si3N4的高γ-Si3N4与α-Si3N4烧结体的最高相对密度与维氏硬度分别为99.20%,23.42 GPa和98.78%,21.87 GPa;烧结体由相互交错的长柱状β-Si3N4晶粒组成,显微结构均匀.
超高压烧结
维氏硬度
显微结构
silicon nitride
ultra-high pressure sintering
Vickers hardness
microstructure
Abstract
Ultra-high pressure sintering of γ-Si3N4 and α-Si3N4 with Y2O3-Al2O3-La2O3 as additives was studied under pressures of 5.4-5.7 GPa and at temperatures of 1 620-1 770 K.The relative density,Vichers hardness and phase composition of sintered compacts were investigated.The results show that both γ-Si3N4 and α-Si3N4 transformed to β-Si3N4 completely after sintering.The relative densities and Vickers hardness of γ-Si3N4 sintered compacts were higher than those of α-Si3N4 sintered compacts prepared under the same conditions.The highest relative density and Vickers hardness in all the as-sintered samples of γ-Si3N4 and α-Si3N4 were 99.20% and 23.42 GPa,98.78% and 21.87 GPa,respectively.The sintered compacts were composed of elongated β-Si3N4 rod crystals with disordered orientation and uniform microstructure.
中图分类号 TQ174.1
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50472102)
收稿日期 2008/9/22
修改稿日期 2009/5/10
网络出版日期
作者单位点击查看
备注姚怀(1978-),男,河南驻马店人,助教,硕士研究生.
引用该论文: YAO Huai,XU Qiao-yu,TANG Jing-you,CHANG Qing-hua. Characteristic Comparison of α-Si3N4 and γ-Si3N4 Sintered under Ultra-high Pressure[J]. Materials for mechancial engineering, 2009, 33(10): 46～49
姚怀,徐巧玉,唐敬友,苌清华. α-Si3N4与γ-Si3N4超高压烧结体的性能对比[J]. 机械工程材料, 2009, 33(10): 46～49
被引情况:
【1】古亚军,张海军,李发亮,张少伟, "原位合成NiO催化硅粉氮化制备氮化硅",机械工程材料 40, 65-68(2016)
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【2】JIANG J Z,KRAGH F,FROST D J,et al.Hardness and thermal stability of cubic silicon nitride[J].J Phys: Condens Matter,2001,13:L515-L520.
【3】TANAKA I,MIZOGUCHI T,SEKINE T,et al.Electron energy loss near-edge strctures of cubic Si3N4[J].Appl Phys Lett,2001,78(15):2134-2136.
【4】ZERR A,MIEHE G,SERGHIOU G,et al.Synthesis of cubic silicon nitride[J].Nature,1999,400:340-342.
【5】MO S D,OUYANG L,CHING W Y,et al.Interesting properties of new spinel phase of Si3N4 and C3N4[J].Phys Rev lett,1999,83:5046-5049.
【6】SEKINE T,HE H L,KOBAYASHI T,et al.Shock-induced transformation of β-Si3N4 to a high-pressure cubic-spinel phase[J].Appl Phys Lett,2000,76(25):3706-3708.
【7】JIANG J Z,STAHL K,BERGE R W,et al.Structural characterization of cubic silicon nitride[J].Europhys Lett,2000,51(1):62-67.
【8】SCHARZ M,MIEHE G,ZERR A,et al.Spinel-Si3N4: multi-anvil press synthesis and structural refinement[J].Advanced Mater,2000,12:833-887.
【9】MCMILLAN P F.New materials from high-pressure experiments[J].Nature Materials,2002,51:62-67.
【10】HWANG C J,Tien T Y.Microstructural development in silicon nitride ceramics[J].Mater Sci Forum,1989,47:84-109.
【11】姚怀,唐敬友,刘雨声,等.立方氮化硅的合成与提纯[J].硅酸盐学报,2007,3(1):31-34.
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