JP6032375B2 - 立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体 - Google Patents
立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体 Download PDFInfo
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Description
本発明は、このような問題を解決するために、耐欠損性を向上させることにより、切削工具や耐摩耗工具の寿命を長くすることのできる立方晶窒化硼素焼結体および被覆立方晶窒化硼素焼結体を提供することを目的とする。
(1)立方晶窒化硼素と、結合相と、不可避不純物とを含む立方晶窒化硼素焼結体であって、
前記立方晶窒化硼素の量は、50体積%以上80体積%以下であり、
前記結合相と前記不可避不純物の合計量は、20体積%以上50体積%以下であり、
前記結合相は、Al化合物と、Ti化合物とを含み、
前記Al化合物は、Al元素と、N、OおよびBからなる群から選択される少なくとも1種の元素とを含み、
前記Ti化合物は、Ti元素と、C、NおよびBからなる群から選択される少なくとも1種の元素とを含み、
前記Al化合物は、AlNとAl2O3とを含み、
AlNの(100)面のX線回折強度をI1、Al2O3の(104)面のX線回折強度をI2としたとき、I1/I2は、6以上40以下であり、
前記立方晶窒化硼素と前記Al化合物の合計の面積をS1、前記立方晶窒化硼素と前記Al化合物とが連続して接する領域の面積をS2としたとき、S2/S1は、0.98以上1.00以下である、
立方晶窒化硼素焼結体。
(2)前記Ti化合物は、TiB2を含み、
TiB2の(101)面のX線回折強度をI3としたとき、I3/I1は、0.5以上2.0以下である(1)の立方晶窒化硼素焼結体。
(3)前記Al化合物の面積をSAとし、前記Ti化合物の面積をSTとしたとき、ST/SAは1以上3以下である(1)または(2)の立方晶窒化硼素焼結体。
(4)前記立方晶窒化硼素の平均粒径が0.3μm以上1.5μm以下である(1)〜(3)のいずれかの立方晶窒化硼素焼結体。
(5)(1)〜(4)のいずれかの立方晶窒化硼素焼結体と、前記立方晶窒化硼素焼結体の表面に形成された被膜とを備える被覆立方晶窒化硼素焼結体。
(6)前記被膜が、Ti、Zr、Hf、V、Nb、Ta、Cr、Mo、W、AlおよびSiからなる群から選択される少なくとも1種の元素と、C、N、OおよびBからなる群から選択される少なくとも1種の元素とからなる(5)の被覆立方晶窒化硼素焼結体。
(7)前記被膜が、単層膜、または、2層以上を含む積層膜である(5)または(6)の被覆立方晶窒化硼素焼結体。
(8)前記被膜全体の平均膜厚が0.5μm以上20μm以下である(5)〜(7)のいずれかの被覆立方晶窒化硼素焼結体。
Al化合物の粒子によってAl化合物が囲まれている場合でも、切削加工時に発生した熱は、熱伝導率の高いAl化合物を経由して放熱される。
出力:50kV、250mA
入射側ソーラースリット:5°
発散縦スリット:1/2°
発散縦制限スリット:10mm
散乱スリット:2/3°
受光側ソーラースリット:5°
受光スリット:0.15mm
BENTモノクロメータ
受光モノクロスリット:0.8mm
サンプリング幅:0.02°
スキャンスピード:2°/min
2θ測定範囲:30〜90°
まず、レーザーフラッシュ熱物性測定装置によって、立方晶窒化硼素焼結体の熱拡散率を測定する。
つぎに、測定した熱拡散率、比熱、および密度から、熱伝導率を算出することができる。
立方晶窒化硼素焼結体を、径10mm×厚み3mmの試料に加工する。立方晶窒化硼素焼結体の試料に、カーボンスプレーを塗布する。
NETZSCH製レーザーフラッシュ熱物性測定装置LFA457(Ndガラスレーザー、レーザー波長1.06μm、レーザーパルス幅0.3ms、レーザーパルスエネルギー0〜18J)を用いて、レーザー加熱後の試料の裏面の温度変化を測定する。
炉内の温度は、400℃である。炉内は、窒素雰囲気である。
立方晶窒化硼素焼結体の試料の熱拡散率を、5回測定する。5回の測定値の平均値を算出する。熱伝導率は、比熱、熱拡散率の平均値、および密度の積から求めることができる。
立方晶窒化硼素の平均粒径は、SEMで撮影した立方晶窒化硼素焼結体の組織写真を、市販の画像解析ソフトで解析して求めることができる。
本発明の被膜は、第1の元素と、第2の元素とを含む化合物の層であることが好ましい。本発明の被膜は、単層、または、複数の層を含む積層であることが好ましい。第1の元素は、Ti、Zr、Hf、V、Nb、Ta、Cr、Mo、W、Y、AlおよびSiからなる群から選択される少なくとも1種の元素であることが好ましい。第2の元素は、C、N、OおよびBからなる群から選択される少なくとも1種の元素であることが好ましい。被膜がこのような構成を有する場合、被覆工具の耐摩耗性が向上する。
チタン化合物粉末と、Al3Ti粉末と、立方晶窒化硼素粉末と、パラフィンとを混合する。チタン化合物粉末は、例えば、窒化チタン、炭化チタン、または炭窒化チタンである。
出力:50kV、250mA
入射側ソーラースリット:5°
発散縦スリット:1/2°
発散縦制限スリット:10mm
散乱スリット:2/3°
受光側ソーラースリット:5°
受光スリット:0.15mm
BENTモノクロメータ
受光モノクロスリット:0.8mm
サンプリング幅:0.02°
スキャンスピード:2°/min
外周連続乾式切削(旋削)、
被削材:SCM415H(HRC60.9〜61.7)、
被削材形状:90°V溝2本入り円柱φ48mm×L200mm、
切削速度:100m/min、
切込み:0.15mm、
送り:0.15mm/rev、
工具寿命:欠損するまでの切削時間。
端面断続乾式切削(旋削)、
被削材:SCM415H(HRC60.9〜61.7)、
被削材形状:15mm幅の溝2本入り円盤φ180mm×L20mm(被削材は、円盤の中心にφ45mmの穴を有する)、
切削速度:100m/min、
切込み:0.2mm、
送り:0.1mm/rev、
工具寿命:欠損するまでの切削時間。
発明品1〜4の立方晶窒化硼素焼結体の表面に、平均膜厚3μmのTiN膜を被覆した。TiN膜を被覆した発明品1〜4を、発明品8〜11と呼ぶ。
発明品5〜7の立方晶窒化硼素焼結体の表面に、平均膜厚3μmのTiAlN膜を被覆した。TiAlN膜を被覆した発明品5〜7を、発明品12〜14と呼ぶ。
Claims (8)
- 立方晶窒化硼素と、結合相と、不可避不純物とを含む立方晶窒化硼素焼結体であって、
前記立方晶窒化硼素の量は、50体積%以上80体積%以下であり、
前記結合相と前記不可避不純物の合計量は、20体積%以上50体積%以下であり、
前記結合相は、Al化合物と、Ti化合物とを含み、
前記Al化合物は、Al元素と、N、OおよびBからなる群から選択される少なくとも1種の元素とを含み、
前記Ti化合物は、Ti元素と、C、NおよびBからなる群から選択される少なくとも1種の元素とを含み、
前記Al化合物は、AlNとAl2O3とを含み、
AlNの(100)面のX線回折強度をI1、Al2O3の(104)面のX線回折強度をI2としたとき、I1/I2は、6以上40以下であり、
前記立方晶窒化硼素と前記Al化合物の合計の面積をS1、前記立方晶窒化硼素と前記Al化合物とが接する領域のうち最大の領域の面積をS2としたとき、S2/S1は、0.98以上1.00以下である、立方晶窒化硼素焼結体。 - 前記Ti化合物は、TiB2を含み、
TiB2の(101)面のX線回折強度をI3としたとき、
I3/I1は、0.5以上2.0以下である請求項1に記載の立方晶窒化硼素焼結体。 - 前記Al化合物の面積をSAとし、前記Ti化合物の面積をSTとしたとき、ST/SAは、1以上3以下である請求項1または2に記載の立方晶窒化硼素焼結体。
- 前記立方晶窒化硼素の平均粒径が0.3μm以上1.5μm以下である請求項1から請求項3のうちいずれか1項に記載の立方晶窒化硼素焼結体。
- 請求項1から請求項4のうちいずれか1項に記載の立方晶窒化硼素焼結体と、前記立方晶窒化硼素焼結体の表面に形成された被膜とを備える被覆立方晶窒化硼素焼結体。
- 前記被膜が、Ti、Zr、Hf、V、Nb、Ta、Cr、Mo、W、AlおよびSiからなる群から選択される少なくとも1種の元素と、C、N、OおよびBからなる群から選択される少なくとも1種の元素とからなる請求項5に記載の被覆立方晶窒化硼素焼結体。
- 前記被膜が、単層膜、または、2層以上を含む積層膜である請求項5または請求項6に記載の被覆立方晶窒化硼素焼結体。
- 前記被膜全体の平均膜厚が0.5μm以上20μm以下である請求項5から請求項7のうちいずれか1項に記載の被覆立方晶窒化硼素焼結体。
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