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Title:
TWO-STEP PRESSURE SINTERING METHOD FOR PREPARING TRANSPARENT YTTRIUM OXIDE CERAMIC PART
Document Type and Number:
WIPO Patent Application WO/2017/133050
Kind Code:
A1
Abstract:
Disclosed is a two-step pressure sintering method for preparing a transparent yttrium oxide ceramic part. The method comprises the following steps: (1) synthesizing a ceramic powder: preparing a high-purity superfine yttrium oxide nano-ceramic powder by a reverse coprecipitation process; (2) sintering a transparent yttrium oxide ceramic: preparing a transparent yttrium oxide nano-ceramic by a spark plasma sintering process involving a two-step pressurization technique; and (3) post-treatment: after the spark plasma sintering process, removing a sample, annealing the sample, and grinding and polishing the sample to obtain the transparent yttrium oxide ceramic part as the final product. The two-step pressure sintering method for preparing a transparent yttrium oxide ceramic part first prepares, using a reverse coprecipitation method, an yttrium oxide nanopowder with a smaller and uniform particle size, followed by a spark plasma sintering process with two-step pressurization to prepare the transparent yttrium oxide ceramic part with excellent compactness, uniform particle size and excellent performance. The transparent yttrium oxide ceramic part prepared has a strength exceeding 400 MPa and a transparency of higher than 60%.

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Inventors:
LIU WEI (CN)
CHEN JIAN (CN)
WU HAIDONG (CN)
BAI SHUAIXING (CN)
WU SHANGHUA (CN)
Application Number:
PCT/CN2016/075448
Publication Date:
August 10, 2017
Filing Date:
March 03, 2016
Export Citation:
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Assignee:
UNIV GUANGDONG TECHNOLOGY (CN)
International Classes:
C04B35/505; C01F17/218; C04B35/645
Foreign References:
CN101269964A2008-09-24
CN104529449A2015-04-22
CN101224974A2008-07-23
CN102190499A2011-09-21
Other References:
AN, LIQIONG ET AL.: "Transparent Yttria Produced by Spark Plasma Sintering at Moderate Temperature and Pressure Profiles", JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 5, no. 32, 14 December 2011 (2011-12-14), pages 1035 - 1040, XP028439716, ISSN: 0955-2219
Attorney, Agent or Firm:
BEIJING KEYI INTELLECTUAL PROPERTY FIRM (CN)
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