JP6322584B2 - Y2o3安定化酸化ジルコニウムから構成されるセラミック焼結成形体と、y2o3安定化酸化ジルコニウムから構成されるセラミック焼結成形体の製造方法 - Google Patents
Y2o3安定化酸化ジルコニウムから構成されるセラミック焼結成形体と、y2o3安定化酸化ジルコニウムから構成されるセラミック焼結成形体の製造方法 Download PDFInfo
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- JP6322584B2 JP6322584B2 JP2014559099A JP2014559099A JP6322584B2 JP 6322584 B2 JP6322584 B2 JP 6322584B2 JP 2014559099 A JP2014559099 A JP 2014559099A JP 2014559099 A JP2014559099 A JP 2014559099A JP 6322584 B2 JP6322584 B2 JP 6322584B2
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Description
本発明に係る焼結成形体は、
−理論焼結密度の少なくとも99%の焼結密度を有し、
−180nm未満の平均粒径を有し、
−少なくとも98重量%の濃度で正方晶相及び立方晶相を備えるジルイコニアの割合を有し、
−水蒸気雰囲気において134℃、2バールで120時間後に3重量%未満の単斜晶の割合を有する、
点を特徴とする。
−少なくとも65重量%の割合のY 2 O 3 安定化ジルコニアを有するサブミクロンパウダーの分散、
−100μm以下の直径を有する粉砕媒体によって、分散したサブミクロンパウダーを0.42μm未満の粒径d95まで粉砕、
−粉砕したサブミクロンパウダーの分散系を成形して、成形体を形成、
−該成形体を焼結して、焼結成形体を形成。
撹拌ユニットにおいて、270mlの水を入れて、適切な分散剤を加える。次いで、6m2/gの固有の表面積を有する3Y−TZPパウダーを500g入れて混ぜる。そのスラリーを撹拌機ボールミルに入れる。ミルは、100μmの直径を有する粉砕ボールで85%まで満たされる。スラリーを11m/sの周速に一致する毎分3500回転で2時間粉砕し、d95値<0.42μm、d50値<0.3μmを特徴とする粒径分布にする。
撹拌ユニットにおいて、270mlの水を入れて、適切な分散剤を加える。次いで、6m2/gの固有の表面積を有する3Y−TZPパウダーを450gと、12m2/gの固有の表面積を有するα−Al2O3パウダーを50gとを入れて混ぜる。そのスラリーを撹拌機ボールミルに入れる。
2回分の3Y−TZPチャージと1回分のATZチャージ(90重量%の3Y−TZP/10重量%のAl2O3)を準備する。それぞれ、70nm、100nmの粒径を有するTZ3Y−SE(東ソー、日本)、TM−DAR(大明化学、日本)を原料として使用した。これらのパウダーは、0.5%のポリアクリル酸アンモニウム(Zschimmer & Schwarz、ドイツ)を用いて水中に分散し、次いで様々な粉砕ボール径を用いて撹拌機ボールミル(Mini Cer, Netzsch FMT、ドイツ)内で粉砕、分散する。図1はその組成と粉砕パラメータを示す。
Claims (21)
- 97モル%のジルコニアと3モル%のY2O3から成るY2O3安定化ジルコニアから成るセラミック焼結成形体であって、
−理論焼結密度の少なくとも99%の焼結密度を有し、
−180nm未満の平均粒径を有し、
−少なくとも98重量%の濃度で正方晶相及び立方晶相を備えるジルコニアの割合を有し、
−水蒸気雰囲気において134℃、2バールで120時間後に3重量%未満の単斜晶の割合を有する、
セラミック焼結成形体。 - 3モル%Y2O3安定化ジルコニアと2〜15重量%の不安定ジルコニアに基づくセラミック焼結成形体であって、
−理論焼結密度の少なくとも99%の焼結密度を有し、
−180nm未満の平均粒径を有し、
−少なくとも98重量%の濃度で正方晶相及び立方晶相を備えるジルコニアの割合を有し、
−水蒸気雰囲気において134℃、2バールで120時間後に3重量%未満の単斜晶の割合を有する、
セラミック焼結成形体。 - 前記不安定ジルコニアは正方晶相にある、請求項2に記載のセラミック焼結成形体。
- 前記ジルコニアの割合の75〜95重量%は正方晶相にあり、前記ジルコニアの割合の5〜25重量%は立方晶相にあり、2重量%未満の単斜晶の割合がある、請求項2に記載のセラミック焼結成形体。
- 3モル%Y2O3安定化ジルコニアと0.2〜20重量%のα−Al2O3 に基づくセラミック焼結成形体であって、
−理論焼結密度の少なくとも99%の焼結密度を有し、
−180nm未満の平均粒径を有し、
−少なくとも98重量%の濃度で正方晶相及び立方晶相を備えるジルコニアの割合を有し、
−水蒸気雰囲気において134℃、2バールで120時間後に3重量%未満の単斜晶の割合を有する、
セラミック焼結成形体。 - 前記ジルコニアの割合の75〜95重量%は正方晶相にあり、前記ジルコニアの割合の5〜25重量%は立方晶相にあり、2重量%未満の単斜晶の割合がある、請求項5に記載のセラミック焼結成形体。
- 前記セラミック焼結成形体は少なくとも1000MPaの4点曲げ強さを有する、請求項5に記載のセラミック焼結成形体。
- 請求項1に記載のセラミック焼結成形体の製造方法であって、
−少なくとも65重量%の割合の3モル%Y2O3安定化ジルコニアを備えて成るサブミクロンパウダーを分散するステップと、
−100μm以下の直径を有する粉砕媒体によって、分散したサブミクロンパウダーを0.42μm未満の粒径d95まで粉砕するステップと、
−粉砕したサブミクロンパウダーの分散系を成形して、成形体を形成するステップと、
−該成形体を焼結して、焼結成形体を形成するステップと、
を有する方法。 - 前記サブミクロンパウダーは20m2/g未満の固有の表面積を有する、請求項8に記載の方法。
- 前記成形はスリップキャスティングにより実行される、請求項8に記載の方法。
- 前記成形体は1200℃〜1350℃の焼結温度で焼結される、請求項8に記載の方法。
- 更に前記焼結成形体は1200℃〜1350℃の温度で熱間静水圧再圧縮を受ける、請求項11に記載の方法。
- 請求項2に記載のセラミック焼結成形体の製造方法であって、
−少なくとも65重量%の割合の3モル%Y 2 O 3 安定化ジルコニアと2〜15重量%の不安定化ジルコニアを備えて成るサブミクロンパウダーを分散するステップと、
−100μm以下の直径を有する粉砕媒体によって、分散したサブミクロンパウダーを0.42μm未満の粒径d 95 まで粉砕するステップと、
−粉砕したサブミクロンパウダーの分散系を成形して、成形体を形成するステップと、
−該成形体を焼結して、焼結成形体を形成するステップと、
を有する方法。 - 前記サブミクロンパウダーは20m 2 /g未満の固有の表面積を有する、請求項13に記載の方法。
- 前記成形はスリップキャスティングにより実行される、請求項13に記載の方法。
- 前記成形体は1200℃〜1350℃の焼結温度で焼結される、請求項13に記載の方法。
- 更に前記焼結成形体は1200℃〜1350℃の温度で熱間静水圧再圧縮を受ける、請求項16に記載の方法。
- 請求項5に記載のセラミック焼結成形体の製造方法であって、
−少なくとも65重量%の割合の3モル%Y2O3安定化ジルコニアと0.2〜20重量%のα−Al2O3を備えて成るサブミクロンパウダーを分散するステップと、
−100μm以下の直径を有する粉砕媒体によって、分散したサブミクロンパウダーを0.42μm未満の粒径d95まで粉砕するステップと、
−粉砕したサブミクロンパウダーの分散系を成形して、成形体を形成するステップと、
−該成形体を焼結して、焼結成形体を形成するステップと、
を有する方法。 - 前記サブミクロンパウダーは20m2/g未満の固有の表面積を有する、請求項18に記載の方法。
- 前記成形はスリップキャスティングにより実行される、請求項18に記載の方法。
- 前記成形体は1200℃〜1350℃の焼結温度で焼結される、請求項18に記載の方法。
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DE201210101741 DE102012101741A1 (de) | 2012-03-01 | 2012-03-01 | Keramischer Sinterformkörper aus Y2O3-stabilisiertem Zirkonoxid und Verfahren zur Herstellung eines keramischen Sinterformkörpers aus Y2O3-stabilisiertem Zirkonoxid |
PCT/DE2013/100079 WO2013127398A2 (de) | 2012-03-01 | 2013-03-01 | Keramischer sinterformkörper aus y2o3-stabilisiertem zirkonoxid und verfahren zur herstellung eines keramischen sinterformkörpers aus y2o3-stabilisiertem zirkonoxid |
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