JP6741017B2 - 複合多結晶体 - Google Patents
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Description
特開2003−292397号公報(特許文献1)および国際公開第2009/099130号(特許文献2)に開示されるダイヤモンド多結晶体は、耐摩耗工具である伸線ダイスに適用すると、局所摩耗により伸線時の引抜抵抗が増大し伸後の線径が小さくなり断線が多くなり、切削工具であるスクライブホイールや掘削用ビットに適用すると、局所摩耗、衝撃による欠けなどにより工具寿命が短くなるという問題点があった。
[本開示の効果]
本開示によれば、耐摩耗工具、切削工具などの材料として好適に用いられる、耐摩耗性の高い、多結晶ダイヤモンドと非ダイヤモンド状炭素とを含む複合多結晶体を提供できる。かかる複合多結晶体は、耐摩耗性が高いことから、摩耗により工具寿命が短くなるのを防ぐため、工具寿命を延ばすことができる。
本発明のある実施形態である複合多結晶体は、ダイヤモンド粒子が互いに直接結合して形成される多結晶ダイヤモンドと、多結晶ダイヤモンド中に分散される圧縮型グラファイトと、を含む。本実施形態の複合多結晶体は、多結晶ダイヤモンド中に分散される圧縮型グラファイトを含むため、耐摩耗性が高い。
図1を参照して、本実施形態の複合多結晶体10は、ダイヤモンド粒子が互いに直接結合して形成される多結晶ダイヤモンド11と、多結晶ダイヤモンド中に分散される圧縮型グラファイト12と、を含む。本実施形態の複合多結晶体10は、多結晶ダイヤモンド11中に分散される圧縮型グラファイト12を含むため、耐摩耗性が高い。
本実施形態の複合多結晶体10の製造方法は、特に制限はないが、耐摩耗性の高い複合多結晶体10を効率よくかつ低コストで製造する観点から、原料として非ダイヤモンド状炭素を準備する原料準備工程と、上記原料をダイヤモンド相が形成される温度および圧力の条件で焼結することにより複合多結晶体10を形成する複合多結晶体形成工程と、を含むことが好ましい。
実施例1〜5に関わる複合多結晶体を以下の方法で作製した。まず、出発物質として、平均粒径が300〜3000nmのグラファイト粒子を焼き固めて型押し成形された、密度1.85g/cm3、純度99.95質量%以上のグラファイト成形体を準備した(原料準備工程)。次いで、上記で準備したグラファイト成形体を高融点金属からなるカプセルに入れ、高圧発生装置を用いて、表1(「合成条件」の欄)に記載した温度および圧力において20分間保持することにより、グラファイト成形体をダイヤモンドに変換させ、かつ焼結させた(複合多結晶体形成工程)。これにより各実施例の複合多結晶体を得た。
比較例1に関わる複合多結晶体を以下の方法で作製した。まず、出発物質として、平均粒径300nmのグラファイト粒子を型押し成形された、密度1.85g/cm3、純度99.95質量%のグラファイト成形体を準備した(原料準備工程)。次いで、上記で準備したグラファイト成形体を高融点金属からなるカプセルに入れ、高圧発生装置を用いて、表1(「合成条件」の欄)に記載した温度および圧力において20分間保持することにより、グラファイト成形体をダイヤモンドに変換させ、かつ焼結させた(複合多結晶体形成工程)。これにより各比較例の複合多結晶体を得た。
比較例2および3に関わる複合多結晶体を以下の方法で作製した。まず、出発物質として、グラファイト粉末を、遊星ボールミルで平均粒径10nm未満に微粉砕したもの型押し成形して、密度1.80g/cm3、純度99.5質量%のグラファイト成形体を準備した(原料準備工程)。次いで、上記で準備したグラファイト成形体を高融点金属からなるカプセルに入れ、高圧発生装置を用いて、表1(「合成条件」の欄)に記載した温度および圧力において20分間保持することにより、グラファイト成形体をダイヤモンドに変換させ、かつ焼結させた(複合多結晶体形成工程)。これにより各比較例の複合多結晶体を得た。
Claims (7)
- ダイヤモンド粒子が互いに直接結合して形成される多結晶ダイヤモンドと、前記多結晶ダイヤモンド中に分散される圧縮型グラファイトと、を含む複合多結晶体。
- 前記多結晶ダイヤモンドの相が三次元的に連続している請求項1に記載の複合多結晶体。
- 前記多結晶ダイヤモンドを形成する前記ダイヤモンド粒子の平均粒径が10nm以上1000nm以下である請求項1または請求項2に記載の複合多結晶体。
- 前記圧縮型グラファイトの平均粒径が10nm以上2000nm以下である請求項1から請求項3のいずれか1項に記載の複合多結晶体。
- 前記複合多結晶体の全体に対する前記圧縮型グラファイトの占める割合は、前記複合多結晶体のX線回折プロファイルにおいて前記圧縮型グラファイトの(002)面に由来するX線回折ピークの面積をIg(002)とし前記多結晶ダイヤモンドの(111)面に由来するX線回折ピークの面積をId(111)とするときの100×Ig(002)/{Id(111)+Ig(002)}の値が、0.1%以上40%以下である請求項1から請求項4のいずれか1項に記載の複合多結晶体。
- ヌープ硬度が50GPa以上である請求項1から請求項5のいずれか1項に記載の複合多結晶体。
- ダイヤモンド粒子が互いに直接結合して形成される多結晶ダイヤモンドと、前記多結晶ダイヤモンド中に分散される圧縮型グラファイトと、を含む複合多結晶体であって、
前記多結晶ダイヤモンドの相が三次元的に連続しており、
前記多結晶ダイヤモンドを形成する前記ダイヤモンド粒子の平均粒径が10nm以上1000nm以下であり、
前記圧縮型グラファイトの平均粒径が10nm以上2000nm以下であり、
前記複合多結晶体の全体に対する前記圧縮型グラファイトの占める割合は、前記複合多結晶体のX線回折プロファイルにおいて前記圧縮型グラファイトの(002)面に由来するX線回折ピークの面積をIg(002)とし前記多結晶ダイヤモンドの(111)面に由来するX線回折ピークの面積をId(111)とするときの100×Ig(002)/{Id(111)+Ig(002)}の値が、0.1%以上40%以下であり、
ヌープ硬度が50GPa以上である複合多結晶体。
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PCT/JP2016/079939 WO2017073297A1 (ja) | 2015-10-30 | 2016-10-07 | 複合多結晶体 |
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WO2019146353A1 (ja) * | 2018-01-24 | 2019-08-01 | 住友電気工業株式会社 | 複合多結晶ダイヤモンド及びその製造方法 |
CN110318032A (zh) * | 2018-03-29 | 2019-10-11 | 中国科学院宁波材料技术与工程研究所 | 一种超细纳米晶金刚石精密刀具及其制造方法 |
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JP2002060733A (ja) * | 2000-08-17 | 2002-02-26 | Ishizuka Kenkyusho:Kk | ダイヤモンド研磨材粒子及びその製法 |
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JP4203900B2 (ja) * | 2002-10-11 | 2009-01-07 | 住友電気工業株式会社 | ダイヤモンド多結晶体およびその製造方法 |
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CN106232276B (zh) * | 2014-04-24 | 2019-04-05 | 京瓷株式会社 | 被覆工具 |
JP6390151B2 (ja) * | 2014-04-30 | 2018-09-19 | 住友電気工業株式会社 | 複合焼結体 |
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