JP5189504B2 - 複合焼結体 - Google Patents
複合焼結体 Download PDFInfo
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- JP5189504B2 JP5189504B2 JP2008556062A JP2008556062A JP5189504B2 JP 5189504 B2 JP5189504 B2 JP 5189504B2 JP 2008556062 A JP2008556062 A JP 2008556062A JP 2008556062 A JP2008556062 A JP 2008556062A JP 5189504 B2 JP5189504 B2 JP 5189504B2
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- 239000002131 composite material Substances 0.000 title claims description 34
- 239000011230 binding agent Substances 0.000 claims description 62
- 239000002245 particle Substances 0.000 claims description 54
- 150000001875 compounds Chemical class 0.000 claims description 50
- 229910052726 zirconium Inorganic materials 0.000 claims description 24
- 239000006104 solid solution Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 229910052582 BN Inorganic materials 0.000 claims description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 description 43
- 239000000463 material Substances 0.000 description 16
- 239000000843 powder Substances 0.000 description 16
- 229910052721 tungsten Inorganic materials 0.000 description 14
- 239000000919 ceramic Substances 0.000 description 13
- 229910000760 Hardened steel Inorganic materials 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000002775 capsule Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Description
高硬度焼入鋼の切削時には刃先が高温に曝されるため、鉄との反応性が高いcBN粒子が選択的に摩滅する。その結果、凸型に露出した結合材が機械的に擦過され破壊、脱落し摩耗が進行する。
以下、実施例を挙げて本発明に係る複合焼結体の一例を具体的に説明するが、本発明はこれらに限定されるものではない。
超硬合金製のポットおよびボールを用いてTiN0.6またはTi(CN)0.6とAlを種々の重量比で混合した粉末を真空中で1200℃、30分間熱処理をした化合物を粉砕し、結合材粉末を得た。
φ100×300L、丸棒
切削条件:切削速度V=300m/min.、送りf=0.1mm/rev.、切込みd=0.1mm、DRY
超硬合金製のポットおよびボールを用いてTiN0.6とAlを種々の重量比で混合した粉末を真空中で1200℃、30分間熱処理をした化合物を粉砕し、結合材粉末を得た。
φ100×300L、被削材の軸方向に6本のV溝あり
切削条件:切削速度V=200m/min.、送りf=0.15mm/rev.、切込みd=0.3mm、DRY
内壁がSi3N4製のポットおよびSi3N4製のボールを用いてTiN0.6とAlを80:20の重量比で混合した粉末を真空中で1200℃、30分間熱処理をした化合物を粉砕し、結合材粉末を得た。次にこの結合材と平均粒径1.0μmのcBN粉末とをcBN含有率が60体積%になるように配合した。ここで、内壁がテフロン(登録商標)製のポットとSi3N4製ボールを用いて同配合粉末を均一混合し、同時にSi、W、Coの少なくとも1種を微量添加し均一混合後、真空炉で900℃、20分間保持し、脱ガスした。さらに、この粉末をMo製カプセルに充填後、超高圧装置によって、表5に示す焼結条件で20分焼結した。
φ100×300L、被削材の軸方向に6本のV溝あり
切削条件:切削速度V=120m/min.、送りf=0.1mm/rev.、切込みd=0.2mm、DRY
Claims (6)
- 20体積%以上80体積%以下の立方晶窒化硼素粒子と結合材とを有する複合焼結体であって、
前記結合材は、周期律表第4a族元素、第5a族元素、第6a族元素の窒化物、炭化物、硼化物、酸化物、およびこれらの固溶体からなる群の中から選択された少なくとも一種と、Zr、Si、Hf、Ge、W、Coの単体、化合物、および固溶体からなる群の中から選択された少なくとも1種と、Alの化合物とからなり、
前記複合焼結体中にW及び/又はCoが含有される場合には、該W及び/又はCoの合計重量は2.0重量%未満であり、かつ
前記Zr、Si、Hf、Ge(以下、「X」とする。)のいずれか一以上を含有し、該Xはそれぞれ0.005重量%以上2.0重量%未満であり、かつX/(X+W+Co)が0.01以上1.0以下を満たし、かつ
Alの重量が2.0重量%以上20.0重量%以下であることを特徴とする複合焼結体。 - 前記複合焼結体は、前記結合材中にSi又はZrを含有し、該複合焼結体中に含まれる前記W及び/又はCoの合計重量が1重量%未満であり、かつ前記Si又はZrが0.01重量%以上0.5重量%未満であり、かつSi/(Si+W+Co)又はZr/(Zr+W+Co)が0.05以上1.0以下であることを特徴とする請求の範囲1に記載の複合焼結体。
- 前記複合焼結体は、前記結合材としてTiの化合物を有し、該Tiの化合物の平均粒径が100nm以上400nm以下であり、かつ前記複合焼結体中の結合材に含まれるAlの化合物の平均粒径が50nm以上150nm以下であることを特徴とする請求の範囲2に記載の複合焼結体。
- 前記複合焼結体は、前記結合材に含まれるTiの化合物の平均粒径をRTi、前記結合材に含まれるAlの化合物の平均粒径をRAlとした場合に、RAl/RTiが0.2以上0.5以下であることを特徴とする請求の範囲3に記載の複合焼結体。
- 前記複合焼結体は、前記結合材としてTiの化合物を有し、該Tiの化合物の平均粒径が100nm以上400nm以下であり、かつ前記複合焼結体中の結合材に含まれるAlの化合物の平均粒径が50nm以上150nm以下であることを特徴とする請求の範囲1に記載の複合焼結体。
- 前記複合焼結体は、前記結合材に含まれるTiの化合物の平均粒径をRTi、前記結合材に含まれるAlの化合物の平均粒径をRAlとした場合に、RAl/RTiが0.2以上0.5以下であることを特徴とする請求の範囲5に記載の複合焼結体。
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