文献类型：期刊文献

英文题名：Plastic extrusion forming of nanometre size tetragonal zirconia powder

作者：Zhang, Z.[1]; Hu, L.[1]

机构：[1]E CHINA UNIV SCI & TECHNOL,NATL ENGN RES CTR ULTRAFINE POWDERS,SHANGHAI 200237,PEOPLES R CHINA

年份：1996

卷号：95

期号：5

起止页码：205

外文期刊名：BRITISH CERAMIC TRANSACTIONS

收录：;EI(收录号：1997113497513);WOS:【SCI-EXPANDED(收录号:WOS:A1996VW40600004)】；

语种：英文

外文关键词：Extrusion molding - Grain size and shape - Plasticity - Plastics forming - Polyvinyl alcohols - Powders - Sintering - Zirconia

摘要：Plastic extrusion forming of nanometre size (20 nm) tetragonal zirconia powder with polyvinyl alcohol (PVA) as binder has been studied. Plastic bodies had plasticity indices of 1.0-4.0 kg cm, comparable with clay, when 2-6 wt-% PVA and a water content of 40-60 wt-% were used. The plastic bodies also exhibited high plasticity at low stress levels in stress-strain curves. Green samples had a low relative density (<27%) and underwent a large linear shrinkage (47%) on sintering at 1350-1650 degrees C for 4 h. The grain size of samples sintered at 1650 degrees C for 4 h was 3-10 mu m and the density 99.5% theoretical. The observed high plasticity and low green density are attributed to the very small particle size of the powder, the large specific surface area of the powder absorbing a great amount of wafer (>80 vol.-%) as an interfacial film between the particles.