JP4879015B2 - セラミック焼結体とその製造方法及びセラミック焼結体を用いた装飾用部材 - Google Patents
セラミック焼結体とその製造方法及びセラミック焼結体を用いた装飾用部材 Download PDFInfo
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- JP4879015B2 JP4879015B2 JP2006511556A JP2006511556A JP4879015B2 JP 4879015 B2 JP4879015 B2 JP 4879015B2 JP 2006511556 A JP2006511556 A JP 2006511556A JP 2006511556 A JP2006511556 A JP 2006511556A JP 4879015 B2 JP4879015 B2 JP 4879015B2
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- C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
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Description
2 水槽
3 モーター
4 荷重
5 プーリー
6 糸
7 ワイヤー
また、成形手段として乾式加圧を選択した場合、成形圧力を49乃至196MPaとすることが好適である。成形圧力を49MPa以上としたのは、成形圧力を49MPa未満にすると、セラミック焼結体の気孔率は2%より高くなるか表面の気孔の孔径が50μmを超えたりするからである。さらに、このセラミック焼結体が円環体であって、釣糸用の案内部材として用いた場合、円環体の内周面上に存在する気孔のエッジにより釣糸が損傷を受けやすく、糸切れが発生するおそれがあるからである。
先ず、窒化チタン粉末(純度99%以上、平均粒径22.3μm)、ニッケル粉末(純度99.5%以上、平均粒径12.8μm)、ジルコニア粉末(純度99.5%以上、平均粒径1.5μm)またはアルミナ粉末(純度99.0%以上、平均粒径1.5μm)をセラミック焼結体(以下、焼結体という。)が表1の比率になるように秤量、混合して調合原料とした。次に、得られた調合原料にイソプロピルアルコール溶液を加え、振動ミルを用いて72時間粉砕混合した後、パラフィンワックス等のバインダーを上記調合原料に対し、3質量%添加し、乾燥させて粉体とした。そして、得られた粉体を表1に示す圧力で加圧成形して、実施例に応じて、所望の円環形状の成形体を作製した。
実施例1と同様に、窒化チタン粉末(純度99%以上、平均粒径22.3μm)、ニッケル粉末(純度99.5%以上、平均粒径12.8μm)、ジルコニア粉末(純度99.5%以上、平均粒径1.5μm)またはアルミナ粉末(純度99.0%以上、平均粒径1.5μm)をセラミック焼結体(以下、焼結体と称す。)が表3の比率になるように秤量、混合して調合原料とした。また、表3に示すように、五酸化バナジウム、酸化コバルト、三酸化鉄、酸化エルビニウム、炭化チタンの粉末を着色成分として添加した調合原料も準備した。次に、得られた調合原料にイソプロピルアルコール溶液を加え、振動ミルを用いて72時間粉砕混合した後、パラフィンワックス等のバインダーを上記調合原料に対し、3質量%添加し、乾燥させて粉体とした。そして、得られた粉体を表3に示す圧力で加圧成形して、実施例に応じて、所望の円板形状の成形体を作製した。
表3に示した試料番号53乃至59の一面をバレル研磨にて算術平均高さRa0.05乃至0.2μmの表面に加工した後、前記焼結体の気孔率をアルキメデス法にて測定した。また、気孔の孔径については、金属顕微鏡を用い、倍率400倍で表面を写真撮影して、最も大きな気孔の孔径を測定した。外観は目視で確認した。これらの結果を表5に示す。
表3に示す円板体状の試料番号41,60,61の一面をラップ加工にて算術平均高さRaが0.05乃至0.2μmである表面に加工した後、JIS R 1607−1995の圧子圧入法(IF法:Indetation−Fracture法)に準拠して破壊靱性K1cを測定した。
先ず、第1の硬質相としての窒化チタン粉末(純度99%以上、平均粒径22.3μm)、第2の硬質相としてのジルコニア粉末(純度99.5%以上、平均粒径1.5μm)、結合相としてのニッケル粉末(純度99.5%以上、平均粒径12.8μm)の各比率が、79,15,6質量%となるように秤量、混合して調合原料とした。
先ず、窒化チタン粉末(純度99%以上、平均粒径22.3μm)、ニッケル粉末(純度99.5%以上、平均粒径12.8μm)、ジルコニア粉末(純度99.5%以上、平均粒径1.5μm)、また一部の試料に炭化クロム粉末を焼結体が表8の比率になるように秤量、混合して調合原料とした。
先ず、窒化チタン粉末(純度99%以上、平均粒径22.3μm)、ニッケル粉末(純度99.5%以上、平均粒径12.8μm)、ジルコニア粉末(純度99.5%以上、平均粒径1.5μm)を焼結体が表9の比率になるように秤量、混合して調合原料とした。
Claims (14)
- 67乃至92質量%の炭窒化チタンからなり、その分子式がTiC x N (1−x) (0.01≦x≦0.08)である第1の硬質相と、
アルミナまたはジルコニアの少なくとも1種からなる第2の硬質相と、
ニッケルからなる結合相と、から構成されるとともに、
表面の算術平均高さ(Ra)が0.2μm以下であり、且つ、気孔率が3.7%以下であることを特徴とするセラミック焼結体。 - 上記第2の硬質相を2乃至25質量%、結合相を4乃至10質量%含有するとともに、残部が第1の硬質相であることを特徴とする、請求項1に記載のセラミック焼結体。
- 炭化クロムを3乃至7.4質量%含有することを特徴とする、請求項1又は2に記載のセラミック焼結体。
- 上記第1の硬質相および第2の硬質相の平均粒径が、0.6乃至2.6μmであることを特徴とする、請求項1又は2に記載のセラミック焼結体。
- CIE1976空間L*a*b*の表色系で、表面の明度指数L*が60乃至70であり、表面のクロマティクネス指数a*、b*がそれぞれ7.0乃至8.2,16.5乃至24.5であることを特徴とする、請求項1乃至4のいずれかに記載のセラミック焼結体。
- 気孔率が2%以下であることを特徴とする、請求項1乃至5のいずれかに記載のセラミック焼結体。
- 表面の気孔の孔径が50μm以下であることを特徴とする、請求項1乃至6のいずれかに記載のセラミック焼結体。
- 破壊靱性(K1c)が7MPa・m0.5以上であることを特徴とする、請求項1乃至7のいずれかに記載のセラミック焼結体。
- 請求項1に記載のセラミック焼結体の製造方法であって、平均粒径が15乃至30μmの窒化チタンの粉末、炭素粉末、平均粒径が1乃至2μmのアルミナまたはジルコニアの少なくとも1種からなる粉末及び平均粒径が5乃至20μmのニッケルの粉末を混合して調合原料を作製する工程と、
該調合原料を加圧成形して所望形状の成形体を作製する工程と、
窒素及び不活性ガスの中から選択される少なくとも1種のガス雰囲気中あるいは真空中で該成形体を加熱焼結して焼結体を作製する工程と、
を具備することを特徴とするセラミック焼結体の製造方法。 - 上記調合原料の粉砕粒度(D50)が0.5μm以下であることを特徴とする、請求項9に記載のセラミック焼結体の製造方法。
- 成形圧力が49乃至196MPaであることを特徴とする、請求項9または10に記載のセラミック焼結体の製造方法。
- 真空中での加熱焼結は、1.33Pa以下の真空度で行うことを特徴とする、請求項9乃至11のいずれかに記載のセラミック焼結体の製造方法。
- 加熱焼結の温度が、1200乃至1800℃であることを特徴とする、請求項9乃至12のいずれかに記載のセラミック焼結体の製造方法。
- 請求項1乃至8のいずれかに記載のセラミック焼結体からなることを特徴とする装飾用部材。
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JP4953762B2 (ja) * | 2006-10-27 | 2012-06-13 | 京セラ株式会社 | 熱間押出成形用ダイス |
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JP5235548B2 (ja) * | 2008-07-29 | 2013-07-10 | 京セラ株式会社 | 装飾部品用セラミックスおよび装飾部品 |
WO2010087092A1 (ja) * | 2009-01-28 | 2010-08-05 | 京セラ株式会社 | 装飾部品用セラミックスおよび装飾部品 |
WO2010137652A1 (ja) * | 2009-05-27 | 2010-12-02 | 京セラ株式会社 | 装飾部品用セラミックスおよび装飾部品 |
JP5279659B2 (ja) * | 2009-08-27 | 2013-09-04 | 京セラ株式会社 | 装飾部品用セラミックスおよび釣糸案内用装飾部品 |
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JP6352593B2 (ja) | 2013-05-02 | 2018-07-04 | クラレノリタケデンタル株式会社 | ジルコニア焼結体、ジルコニア組成物及びジルコニア仮焼体、並びに歯科用補綴物 |
US11647740B2 (en) * | 2017-02-27 | 2023-05-16 | Kyocera Corporation | Fishing line guide member and fishing rod provided with same |
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