发展了一种制备高烧结性Y2O3粉的新途径,并以此为原料,在相对低温下采用普通烧结的办法制备出透明Y2O3陶瓷.以硝酸钇为母盐,氨水为沉淀剂,通过控制反应体系中硫酸根离子的含量,生成树枝状的前驱物晶粒,其轴径比为6,经过1100℃煅烧分解,获得一次颗粒为60um,颗粒呈球形,低团聚高纯度的Y2O3粉体.该粉体经过模压成型,不加添加剂,于1700℃真空烧结,得到显微组织均匀的透明Y2O3多晶体,其在近红外区的透光率达70％.
A new method for obtaining highly sinterable Y2O3 powders was developed. Those powders were used to prepare transparent bodies with
conventional sintering at relatively low temperature. Yttrium nitrate was used as a mother salt, and ammonia as a precipitant reagent, the fine
and dendritic precursor crystal was prepared by controlling the content of sulfate ions in the reaction system. The highly pure and low-agglomerated
Y2O3 powders were obtained by calcinating the precursor at 1100℃, the primary particles were spherical and about 60nm
in diameter. The powder compact pressed in steel die could be sintered to transparency without additives under vacuum at 1700℃. The sintered
transparent Y2O3 polycrystalline exhibited a homogeneous microstructure and its transmittance was up to 70% in the near infrared wavelength region.
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