JP2016199793A - 硬質皮膜 - Google Patents
硬質皮膜 Download PDFInfo
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- JP2016199793A JP2016199793A JP2015081410A JP2015081410A JP2016199793A JP 2016199793 A JP2016199793 A JP 2016199793A JP 2015081410 A JP2015081410 A JP 2015081410A JP 2015081410 A JP2015081410 A JP 2015081410A JP 2016199793 A JP2016199793 A JP 2016199793A
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Abstract
Description
[X濃度最高点]
組成式がAlmCr(1-m-n)Xn(NαC(1-α))であり、原子比で、
0.25≦m≦0.70、
0.05≦n≦0.45、
1−m−n>0、および
0.50≦α≦1を満たす点。
[X濃度最低点]
組成式がAlxCr(1-x-y)Xy(NβC(1-β))であり、原子比で、
0.40≦x≦0.80、
0.01≦y≦0.35、
0.50≦β≦1、
1−x−y>0、および
n/y>1.0を満たす点。
る硬質皮膜について鋭意研究を重ねた。その結果、AlとCrとを含む窒化物または炭窒化物に、Crよりも原子番号の大きい第4族元素、第5族元素、および第6族元素よりなる群から選択される少なくとも1種の元素Xを含有させること;下記のX濃度最高点とX濃度最低点を基材表面に対して垂直方向に繰り返し存在させること;更に、組成を上記垂直方向に連続的に変化させることにより、耐摩耗性に優れた硬質皮膜が得られることを見出し、本発明を完成させた。
[X濃度最高点]
組成式がAlmCr(1-m-n)Xn(NαC(1-α))であり、原子比で、
0.25≦m≦0.70、
0.05≦n≦0.45、
1−m−n>0、および
0.50≦α≦1を満たす点。
[X濃度最低点]
組成式がAlxCr(1-x-y)Xy(NβC(1-β))であり、原子比で、
0.40≦x≦0.80、
0.01≦y≦0.35、
0.50≦β≦1、
1−x−y>0、および
n/y>1.0を満たす点。
元素Xは、上述の通り、硬質皮膜の硬さ向上、および安定な酸化物形成に寄与する元素である。更に、後述する繊維状組織の形成に寄与する元素でもある。このような効果を有効に発揮させるために、X濃度最高点における元素Xの原子比の下限を0.05以上とする。以下、X濃度最高点における元素Xの原子比nを「X量n」ということがある。X量nの下限は、好ましくは0.10以上、より好ましくは0.14以上、更に好ましくは0.18以上、より更に好ましくは0.240以上である。一方、X量nが増える程、安定な酸化物が形成されやすくなるが、元素Xが過度に含まれていると元素Xを主体とする化合物が形成され、硬質皮膜が脆くなり耐摩耗性が低下する。そのため、X量nの上限は0.45以下とする。X量nの上限は、好ましくは0.43以下、より好ましくは0.40以下である。
元素Xは、前述の通り硬質皮膜の硬さ向上、および安定な酸化物形成に寄与する元素である。更に、後述する繊維状組織の形成に寄与する元素でもある。このような効果を有効に発揮させるために、X濃度最低点における元素Xの原子比の下限を0.01以上とする。以下、X濃度最低点における元素Xの原子比yを「X量y」ということがある。X量yの下限は、好ましくは0.05以上、より好ましくは0.06以上、更に好ましくは0.065以上である。一方、X量yが増える程、安定な酸化物が形成されやすくなるが、元素Xが過度に含まれていると、元素Xを主体とする化合物が形成され、硬質皮膜が脆くなり耐摩耗性が低下する。そのため、X量yの上限は0.35以下とする。X量yの上限は、好ましくは0.33以下、より好ましくは0.30以下、更に好ましくは0.280未満である。
化物、炭窒化物、炭化物などの中間層を、密着性向上の目的で形成してもよい。
材表面に形成できる。こうした方法としては、例えば、アークイオンプレーティング(A
IP:Arc Ion Plating)法等のイオンプレーティング法や、スパッタリ
ング法等の反応性PVD法が有効である。
の密着性を確保する観点からは、成膜時の基材の温度は、好ましくは300℃以上、より好ましくは400℃以上である。また基材の変形防止等の観点から、好ましくは800℃以下、より好ましくは700℃以下である。
皮膜の全厚さについては、皮膜が形成された超硬試験片、即ち上記断面評価用サンプルを以下の「試料作製装置」で加工した後、以下の「観察装置」により厚さを測定した。試験No.1〜23、25、26の皮膜の全厚さは約3μmであった。
試料作製装置:日立製作所製 集束イオンビーム加工観察装置 FB2000A
観察装置:エスアイアイ・ナノテクノロジ−製 SMI9200 高性能イオン顕微鏡
加速電圧:30kV(FIB通常加工)
イオン源:Ga
作製方法:FIB(Focused Ion Beam:集束イオンビーム)加工法で超硬試験片を加工した。試験片最表面保護のため、高真空蒸着装置およびFIBにてカーボン膜をコーティングした後、FIBマイクロサンプリングにて試験小片を摘出した。その後、摘出した小片をFIB加工により透過電子顕微鏡(TEM)による観察が可能な厚さまで薄片化を行った。
観察使用装置:日本電子製 電界放出形透過電子顕微鏡 JEM−2010F
EDX分析装置:Noran製EDX(Energy Dispersive X−ray spectrometry)分析装置Vantage(JEM−2010F付属)
加速電圧:200kV
観察倍率:750,000倍
上記「組成の分析」で用いた画像を用いて、観察される結晶の短径と長径を測定した。上記結晶の模式図を図7に示す。図7に示す通り、上記結晶に外接する長方形を想定し、この長方形の長辺の長さLを上記結晶の長径とし、短辺Sの長さを上記結晶の短径とした。なお、図7では、本発明の硬質皮膜における繊維状組織の状態をわかりやすく説明するため、一部の繊維状組織についてのみ示した。上記結晶は各々の大きさが違うため、10本測定し、その平均を短径の平均長さ、長径の平均長さとした。短径の平均長さ、および長径の平均長さに基づいて平均アスペクト比を求めた。平均アスペクト比2.5以上の結晶で構成される組織を繊維状組織と判断した。
本実施例では、耐摩耗性を下記逃げ面摩耗幅で評価した。即ち、上記切削試験用サンプルを用いて、下記条件で切削試験を行い、500穴切削時点での逃げ面の最大摩耗幅の平均摩耗幅で耐摩耗性を評価した。
被削材:SCM440(硬度:30HRC)
被削材の厚さ:60mm
切削速度:75m/min
刃送り:0.24mm/REV
穴深さ:ドリル先端から23mm
切削油:ユシローケン FGE180 (原液1に対して15倍稀釈)
給油方法:外部給油
刃先に近い逃げ面と対物レンズが平行になるように設置し、光学顕微鏡200倍で両刃撮影し、両刃の最大摩耗幅の平均を摩耗幅とした。この摩耗幅が小さいほど、耐摩耗性に優れると評価した。これらの結果を表3に示す。なお、500穴に到達せず切削工具が折損した試験No.21、24は、折損したときの切削穴数を表3に記載した。
21、22、23 X濃度最低層
11A、11B、11C、12A、12B、12C X濃度最高点
22A、22B、22C X濃度最低点
Claims (5)
- 基材表面に形成される硬質皮膜であって、
Crよりも原子番号の大きい第4族元素、第5族元素、および第6族元素よりなる群から選択される少なくとも1種の元素Xと、AlとCrとを含む窒化物または炭窒化物からなり、
前記元素Xの濃度が最高となる下記組成のX濃度最高点が、前記基材表面に対して垂直方向に繰り返し存在し、且つ、
前記垂直方向に隣り合う前記X濃度最高点の間に、前記元素Xの濃度が最低となる下記組成のX濃度最低点が1つ以上存在し、
組成が前記垂直方向に連続的に変化することを特徴とする硬質皮膜。
[X濃度最高点]
組成式がAlmCr(1-m-n)Xn(NαC(1-α))であり、原子比で、
0.25≦m≦0.70、
0.05≦n≦0.45、
1−m−n>0、および
0.50≦α≦1を満たす点。
[X濃度最低点]
組成式がAlxCr(1-x-y)Xy(NβC(1-β))であり、原子比で、
0.40≦x≦0.80、
0.01≦y≦0.35、
0.50≦β≦1、
1−x−y>0、および
n/y>1.0を満たす点。 - 全厚さが0.1〜20μmである請求項1に記載の硬質皮膜。
- 結晶の平均アスペクト比が2.5以上、且つ、該結晶の長径が、X濃度最高点のつながりがなす層に対して60〜120°の向きを有する繊維状組織を含む請求項1または2に記載の硬質皮膜。
- 前記結晶の短径の平均長さが0.1〜30nmである請求項1〜3のいずれかに記載の硬質皮膜。
- 請求項1〜4のいずれかに記載の硬質皮膜を基材表面に有する硬質皮膜被覆部材。
Priority Applications (6)
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JP2015081410A JP2016199793A (ja) | 2015-04-13 | 2015-04-13 | 硬質皮膜 |
KR1020177027170A KR20170120164A (ko) | 2015-04-13 | 2016-02-24 | 경질 피막 |
US15/554,643 US20180073124A1 (en) | 2015-04-13 | 2016-02-24 | Hard coating |
CN201680021502.XA CN107532278A (zh) | 2015-04-13 | 2016-02-24 | 硬质皮膜 |
DE112016001719.7T DE112016001719T5 (de) | 2015-04-13 | 2016-02-24 | Hartbeschichtung |
PCT/JP2016/055531 WO2016167032A1 (ja) | 2015-04-13 | 2016-02-24 | 硬質皮膜 |
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JP2015081410A JP2016199793A (ja) | 2015-04-13 | 2015-04-13 | 硬質皮膜 |
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US (1) | US20180073124A1 (ja) |
JP (1) | JP2016199793A (ja) |
KR (1) | KR20170120164A (ja) |
CN (1) | CN107532278A (ja) |
DE (1) | DE112016001719T5 (ja) |
WO (1) | WO2016167032A1 (ja) |
Cited By (4)
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DE112017005145T5 (de) | 2016-10-11 | 2019-07-25 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Fahrerzustands-beurteilungsvorrichtung |
WO2020039736A1 (ja) * | 2018-08-24 | 2020-02-27 | 住友電工ハードメタル株式会社 | 切削工具 |
WO2020039735A1 (ja) * | 2018-08-24 | 2020-02-27 | 住友電工ハードメタル株式会社 | 切削工具 |
WO2024048306A1 (ja) * | 2022-08-29 | 2024-03-07 | 株式会社Moldino | 被覆工具 |
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- 2016-02-24 US US15/554,643 patent/US20180073124A1/en not_active Abandoned
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US20180073124A1 (en) | 2018-03-15 |
WO2016167032A1 (ja) | 2016-10-20 |
DE112016001719T5 (de) | 2017-12-28 |
CN107532278A (zh) | 2018-01-02 |
KR20170120164A (ko) | 2017-10-30 |
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