摘要
获得低粘度、高固相体积分数粉体悬浮液是陶瓷胶态成型的前提条件。为了提高BeO粉体悬浮液的固相体积分数,采用煅烧手段预处理粉体,研究煅烧温度(1 200～1500℃)和煅烧时间(1～4 h)对BeO粉体粒度、比表面积和烧结活性的影响规律,并研究相同固相体积分数(40%)条件下,煅烧对BeO悬浮液粘度的影响。结果表明:在煅烧过程中,粉体颗粒发生长大,比表面积和烧结活性均降低,温度的影响明显大于时间,且煅烧时间低于2h时影响不大,煅烧温度高于1 300℃后粉体相关性能大幅下降;煅烧降低粉体比表面积,除去表面的水分等吸附物质,改善BeO粉体的表面性质,因此在相同固相体积分数(40%)条件下,粉体悬浮液的流动性能得到改善,从而煅烧可提高悬浮液的固相体积分数。
Homogeneous suspensions with low viscosity and high solids loading are necessary for the ceramic colloidal processing.In order to improve the solids loading of BeO suspensions,BeO powders were treated by calcination,and the influences of calcination temperature（1 2001 500 ℃） and calcination time（14 h） on granularity,specific area and sintering property of the powders were investigated,and viscosity properties of BeO suspensions with the same solids loading（40% volume fraction） were studied also.The results show that in the process of calcination the particles coalesced and grew up,the specific area and sinterability of powders were declined,the calcination temperatures above 1 300 ℃ played more important role,calcination time less than 2h took less effect,and the former took priority of the latter.Fluidity of BeO suspensions with the same solids loading（40 % volume fraction） was improved.Because specific areas were descended,the moisture was eliminated,and the surface property was modified.So slurry with higher solids loading can be attained by the calcination method.
出处
《粉末冶金材料科学与工程》
EI
2010年第2期151-156,共6页
Materials Science and Engineering of Powder Metallurgy
关键词
BEO
煅烧
比表面积
烧结活性
胶态成型
BeO
calcination
specific area
sinterability
colloidal processing
