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Clarification of Liquid Phase Sintering Process of Silicon Nitride from the Perspective of Physico-Chemical Properties of High Temperature Melts

从高温熔体物化性能角度阐明氮化硅液相烧结过程

基本信息

批准号：
16360376
负责人：
NAKASHIMA Kunihiko
金额：
$ 9.34万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

The effect of RE_2O_3 (RE=Y,Gd,Nd and La) on the viscosity and the surface tension of 45.2MgO-54.8SiO_2 (mol%) melts have been investigated with rotating crucible viscometer and ring method, respectively. Additionally, structural characterizations of these quenched vitreous samples have been investigated with Infra-Red spectrometer.The viscosities of RE_2O_3-MgO-SiO_2 melts were found to decrease with increasing the content of any rare-earth additions, which suggests that rare-earth oxide behaves as a network modifier of complex silicate anions in high temperature melts. The viscosities decreased in the order of cationic radius of rare-earth ; from Y_2O_3,Gd_2O_3,Nd_2O_3 to La_2O_3. The surface tension of MgO-SiO_2 binary melts were found to increase with increasing the content of any rare-earth additions. The surface tensions obviously increased in the order of cationic radius of rare-earth, which the change of with rare-earth addition is direct antithesis of that of viscosities.Isoth … More ermal growth of (β-Si_3N_4 crystals dispersed in a series of rare-earth (RE=Y,Gd,Nd and La) oxynitride liquids (RE-Mg-Si-O-N) was studied after heat treatment at 1773 K for 64 to 512 min. The microstructural characterization of α-_and β-Si_3N_4 crystals was quantitatively analyzed by electron microscopy. The volume fraction of (β-Si_3N_4 crystals in oxynitride glasses increased with heat treatment time. It is determined that the rate of α/β transformation in the oxynitride liquid with Y_2O_3 additive can be faster than that in oxynitride liquids with other additives. Likewise, the radii of rare-earth elements make significant differences in the mean grain size and aspect ratio of β-Si_3N_4 crystals. In all cases mentioned above, a marked change was observed in the order of ionic radius from La to Y. The mean width of the needlelike β-Si_3N_4 crystals heat-treated with La_2O_3 additive was almost constant in the time range of heat treatment in this study. However, the aspect ratio of β-Si_3N_4 crystals with La_2O_3 additive was found to be much larger than that in oxynitride liquids with other additives, indicating negligible growth of β-prism plane. Less

用旋转坩埚粘度计和圆环法研究了RE_2O_3（RE=Y、Gd、Nd和La）对45.2MgO-54.8SiO_2（mol%）熔体粘度和表面张力的影响。研究发现，随着稀土含量的增加，RE_2O_3-MgO-SiO_2熔体的粘度降低，表明稀土氧化物在高温熔体中起着复杂硅酸盐阴离子网络改性剂的作用。稀土阳离子半径的大小依次为Y_2O_3、Gd_2O_3、Nd_2O_3、La_2O_3。MgO-SiO_2二元熔体的表面张力随稀土含量的增加而增大。表面张力随稀土阳离子半径的增大而增大，其变化规律与粘度的变化规律成反比 ...更多信息本文研究了稀土（RE=Y，Gd，Nd和La）氮氧化物（RE-Mg-Si-O-N）中β-Si_3N_4晶体在1773 K热处理64 ~ 512 min后的热生长，用电子显微镜定量分析了α-和β-Si_3N_4晶体的显微结构。氧氮玻璃中β-Si_3N_4晶体的体积分数随热处理时间的延长而增加。结果表明，添加Y_2O_3的氧氮化合物的α/β转变速率比添加其它添加剂的氧氮化合物的α/β转变速率快。稀土元素的半径对β-Si_3N_4晶体的平均晶粒尺寸和长径比也有显著影响。在上述所有情况下，观察到从La到Y的离子半径顺序的显著变化。添加La_2O_3的针状β-Si_3N_4晶体的平均宽度在热处理时间范围内几乎不变。但添加La_2O_3的β-Si_3N_4晶体的长径比比远大于添加其他添加剂的氧氮化物晶体，表明β-棱柱面的生长可以忽略不计。少

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

RE(RE=Y,Gd,Nd and La)-Mg-Si-O-N系融体中におけるβ-窒化ケイ素の結晶成長

RE(RE=Y,Gd,Nd,La)-Mg-Si-O-N系熔体中β-氮化硅的晶体生长

DOI：
发表时间：
2005
期刊：
日本金属学会誌 69
影响因子：
0
作者：
Nonami A;Taketomi T;Kimura A;Saeki K;Takaki H;et al.;Hiroki Tanaka;Hiroki Tanaka et al.;Hiroki Tanaka;Yuji Sugihara et al.;Hiromichi Tsumori et al.;Hiromichi Tsumori et al.;Yuji Sugihara et al.;津守博通ら;中田大司ら
通讯作者：
中田大司ら

RE(RE=Y, Gd, Nd and La)-Mg-Si-O-N系融体中におけるβー窒化ケイ素の結晶成長

RE(RE=Y、Gd、Nd、La)-Mg-Si-O-N系熔体中β-氮化硅晶体生长

DOI：
发表时间：
2005
期刊：
日本金属学会誌 69
影响因子：
0
作者：
N.Fukatsu;H.Masuoka;H.Kato;N.Kurita;栗田典明;FumiyamiSHIMIZU et al.;Fumiyuki SHIMIZU et al.;Fumiyumi SHIMIZU et al.;齊藤敬高ら;中田大司ら
通讯作者：
中田大司ら

MgO-SiO_2系融体の液相線温度および粘度に及ぼすRE_2O_3(RE=Y, Gd, Nd and La)添加の影響

RE_2O_3(RE=Y、Gd、Nd、La)添加对MgO-SiO_2体系熔体液相线温度和粘度的影响

DOI：
发表时间：
2005
期刊：
日本金属学会誌 69
影响因子：
0
作者：
N.Fukatsu;H.Masuoka;H.Kato;N.Kurita;栗田典明;FumiyamiSHIMIZU et al.;Fumiyuki SHIMIZU et al.;Fumiyumi SHIMIZU et al.;齊藤敬高ら
通讯作者：
齊藤敬高ら

Grain Growth of β-Silicon Nitride in RE (RE=Y,Gd,Nd and La)-Mg-Si-O-N Melts

RE (RE=Y,Gd,Nd,La)-Mg-Si-O-N熔体中β-氮化硅的晶粒生长

DOI：
发表时间：
2005
期刊：
Journal of Japan Institute of Metals Vol.69
影响因子：
0
作者：
N.Fukatsu;H.Masuoka;H.Kato;N.Kurita;栗田典明;FumiyamiSHIMIZU et al.;Fumiyuki SHIMIZU et al.;Fumiyumi SHIMIZU et al.;齊藤敬高ら;中田大司ら;Noritaka SAITO et al.;Daiji NAKATA et al.
通讯作者：
Daiji NAKATA et al.

Effect of RE_2O_3 (RE=Y,Gd,Nd and La) Additions on Liquidus Temperatures and Viscosities of MgO-SiO_2 Melts

RE_2O_3(RE=Y、Gd、Nd和La)添加对MgO-SiO_2熔体液相线温度和粘度的影响

DOI：
发表时间：
2005
期刊：
Journal of Japan Institute of Metals Vol.69
影响因子：
0
作者：
N.Fukatsu;H.Masuoka;H.Kato;N.Kurita;栗田典明;FumiyamiSHIMIZU et al.;Fumiyuki SHIMIZU et al.;Fumiyumi SHIMIZU et al.;齊藤敬高ら;中田大司ら;Noritaka SAITO et al.
通讯作者：
Noritaka SAITO et al.