Compaction and Pressureless Sintering of Zirconia Nanoparticles
Compaction and Pressureless Sintering of Zirconia Nanoparticles
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DOI：
10.1111/j.1551-2916.2007.01781.x
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发表时间：
2007-09
影响因子：
3.9
通讯作者：
M. Trunec;K. Maca
中科院分区：
文献类型：
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作者：
M. Trunec;K. Maca
用3%Y2 O3稳定的4种纳米氧化锆粉制备了致密的块体陶瓷。采用冷等静压工艺，在300~1000 Mpa的压力下制备了陶瓷坯体。陶瓷坯体中气孔的大小及其在烧结过程中的演变与单个纳米粉末的特性以及粉末压坯的烧结行为有关。只有气孔为99%T.D.的均匀绿色物体。)在足够低的温度下，使颗粒尺寸保持在<；100 nm的范围内。粒径为10 nm的均匀粉末可得到具有所需微观结构的生坯。无压烧结得到相对密度大于99%，晶粒度约为85 nm(线性截距法)的坯体(直径20 mm，厚度4 mm)。
Four nanometer-sized zirconia powders stabilized by 3 mol% Y 2 O 3 were used for the preparation of dense bulk ceramics. Ceramic green bodies were prepared by cold isostatic pressing at pressures of 300-1000 MPa. The size of the pores in ceramic green bodies and their evolution during sintering were correlated with the characteristics of individual nanopowders and with the sintering behavior of powder compacts. Only homogeneous green bodies with pores of 99% t.d.) at a sufficiently low temperature to keep the grain sizes in the range < 100 nm. Powders with uniform particles 10 nm in size yielded green bodies of required microstructure. These nanoparticle compacts were sintered without pressure to give bodies (diameter 20 mm, thickness 4 mm) with a relative density higher than 99% and a grain size of about 85 nm (as determined by the linear intercept method).