Synthesis of Nano-Dispersed Powders for Non-Oxide Composites by Spray Pyrolysis Method

喷雾热解法合成非氧化物复合材料纳米分散粉体

基本信息

批准号：
07555487
负责人：
YANO Toyohiko
金额：
$ 0.51万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555487/
关键词：
Spray pyrolysis Non-oxide Composite Alumina SiC Nitrate 噴霧熱分解法粒子分散セラミックス合成微構造

项目摘要

Fine powders for SiC particle reinforced Al_2O_3 composite were prepared by two kind of spray pyrolysis methods, one was using a two-fluid nozzle atomizer and the other was using an ultrasonic vibrator for atomizer, from a suspension of fine SiC particles into aluminum nitrate solution. Characteristics of each powders and the composites prepared from these powders by a hot-press technique were observed using various kinds of experimental tools, such as SEM,TEM,XRD,DTA-TG,a particle size analyzer, a BET surface area meter and an universal testing machine.Powders prepared using a two-fluid nozzle atomizer and pyrolized at 870ﾟC were hollow sphere in shape and having 30m^2/g specific surface areas. It consisted of amorphous alumina and crystalline SiC.SiC containing alumina powders were successfully synthesized by this method in a high synthesis rate and a high retrieval ratio. The as-synthesized powders were secondary particle in 2 to 10 mum in diameter consisted of very fine primarily p … More articles in 50 nm in diameter. SiC contents in the as-synthesized powders were 60 to 70% of the mixing amount in the suspension.Powders prepared using an ultrasonic vibrator for atomizer and pyrolized at 900ﾟC were dense sphere in shape and nearly 1mum in diameter. Whereas synthesis rate was very limited, high retrieval ratio of 70-80% was attained. The powders consisted of mostly amorphous alumina and crystalline SiC.SiC contents in as-sprayd powders were about 40% of the mixing amount in the starting suspension.Both powders were then hot-pressed at 1700ﾟC for 2h in Ar under a 30MPa applied pressure. Composites containing up to 22vol%SiC showed higher bending strength than that of pure alumina prepared by the same technique. In same case, more than twice in strength were achieved. Dispersion of SiC particles restricted grain growth of the matrix grains. From TEM observation of the composites sintered from both powders, it was clarified that nanometer size SiC grains were included into an alumina grains. Thus formation of nano-dispersed composites was confirmed. Less

SIC颗粒增强的Al_2O_3复合材料是Prollosy方法，另一个是使用超声波振动器来进行雾化器，从悬浮的细SIC颗粒悬挂到Anto Anto Anto Anto Anto Anto nitrate溶液中。例如SEM，TEM，XRD，DTA-TG，粒径分析仪，BET表面积通用测试机。使用两流体喷嘴制备的powders在870个Cific表面积上制备。。氧化铝粉被该金属在高检索比中成功合成。是悬浮液的60％至70％。在9 00 C处制备的用于雾化器的超声波振动器和pyloloid的形状是密集的，直径近1MMUM的比例为70-80％。在Sub-Sprayd粉末中，在30MPA施加的压力下，在AR中，当时在1700 C时，粉末在1700 C中的粉末量为40％。与晶粒的晶粒生长相比，从两种粉末中的晶粒生长