A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
ZIRCONIA SINTERED BODY AND MANUFACTURING METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide a zirconia sintered body excellent in strength and toughness as well as water heat degradation resistance.SOLUTION: A zirconia sintered body yttria concentration containing 0.05 to 3 wt.% of alumina of 2 to 4 mol% with a relative density of the zirconia sintered body of 99.7% or more, an average particle diameter of crystal particles of 0.1 to 0.3 μm, flexure strength of 1600 MPa or more and monoclinic phase rate after immersing in hot water at 140°C for 75 hours of 5% or less is used. The sintered body is obtained by molding zirconia particles having the average particle diameter of secondary particles of 0.1 to 0.4 μm, a ratio of the average particle diameter of the secondary particles/the average particle diameter of primary particles measured by an electron microscope of 1 to 8 and yttria concentration containing 0.05 to 3 wt.% of alumina of 2 to 4 mol% and pre-sintering it at 1100 to 1200°C and conducting hot rolling isostatic press treatment on obtained pre-sintered body at pressure of 50 to 500 MPa and temperature of 1150 to 1250°C.
【課題】 強度及び靭性に優れており、これに加えて耐水熱劣化性に優れるジルコニア焼結体を提供する。【解決手段】 アルミナを０．０５〜３重量％含むイットリア濃度２〜４モル％のジルコニア焼結体であり、該ジルコニア焼結体の相対密度が９９．７％以上、結晶 粒子の平均粒径が０．１〜０．３μｍ、曲げ強度が１６００ＭＰａ以上、かつ、１４０℃の熱水中に７５時間浸漬させた後の単斜晶相率が５％以下であるジルコニア焼結体を用いる。該焼結体は、２次粒子の平均粒径が０．１〜０．４μｍであり、該２次粒子の平均粒径／電子顕微鏡で測定される１次粒子の平均粒径の比が１〜８、かつ、アルミナを０．０５〜３重量％含有するイットリア濃度２〜４モル％のジルコニア粉末を成形して１１００〜１２００℃で予備焼結させ、得られた予備焼結体を圧力５０〜５００ＭＰａ、温度１１５０〜１２５０℃で熱間静水圧プレス処理して得る。【選択図】 なし
ZIRCONIA SINTERED BODY AND MANUFACTURING METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide a zirconia sintered body excellent in strength and toughness as well as water heat degradation resistance.SOLUTION: A zirconia sintered body yttria concentration containing 0.05 to 3 wt.% of alumina of 2 to 4 mol% with a relative density of the zirconia sintered body of 99.7% or more, an average particle diameter of crystal particles of 0.1 to 0.3 μm, flexure strength of 1600 MPa or more and monoclinic phase rate after immersing in hot water at 140°C for 75 hours of 5% or less is used. The sintered body is obtained by molding zirconia particles having the average particle diameter of secondary particles of 0.1 to 0.4 μm, a ratio of the average particle diameter of the secondary particles/the average particle diameter of primary particles measured by an electron microscope of 1 to 8 and yttria concentration containing 0.05 to 3 wt.% of alumina of 2 to 4 mol% and pre-sintering it at 1100 to 1200°C and conducting hot rolling isostatic press treatment on obtained pre-sintered body at pressure of 50 to 500 MPa and temperature of 1150 to 1250°C.
【課題】 強度及び靭性に優れており、これに加えて耐水熱劣化性に優れるジルコニア焼結体を提供する。【解決手段】 アルミナを０．０５〜３重量％含むイットリア濃度２〜４モル％のジルコニア焼結体であり、該ジルコニア焼結体の相対密度が９９．７％以上、結晶 粒子の平均粒径が０．１〜０．３μｍ、曲げ強度が１６００ＭＰａ以上、かつ、１４０℃の熱水中に７５時間浸漬させた後の単斜晶相率が５％以下であるジルコニア焼結体を用いる。該焼結体は、２次粒子の平均粒径が０．１〜０．４μｍであり、該２次粒子の平均粒径／電子顕微鏡で測定される１次粒子の平均粒径の比が１〜８、かつ、アルミナを０．０５〜３重量％含有するイットリア濃度２〜４モル％のジルコニア粉末を成形して１１００〜１２００℃で予備焼結させ、得られた予備焼結体を圧力５０〜５００ＭＰａ、温度１１５０〜１２５０℃で熱間静水圧プレス処理して得る。【選択図】 なし
ZIRCONIA SINTERED BODY AND MANUFACTURING METHOD THEREFOR
ジルコニア焼結体及びその製造方法
MATSUI KOJI (author)
2015-12-10
Patent
Electronic Resource
Japanese
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