JP5620649B2 - 高硬度耐摩耗性皮膜の形成方法 - Google Patents
高硬度耐摩耗性皮膜の形成方法 Download PDFInfo
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/72—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes more than one element being applied in one step
- C23C8/74—Carbo-nitriding
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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Description
なお、溶射を大気中で行うことができるのは、基材は常温であるために溶射前及び溶射中に基材が酸化されることがないためである。また、具体的な溶射装置としては、例えば、特開2005−68457号に記載の技術を用いることができる。
1.第1の実施の形態(TiC皮膜)
2.第2の実施の形態(TiCN皮膜(1))
3.第3の実施の形態(TiCN皮膜(2))
[高硬度耐摩耗性皮膜の形成方法の一例]
図1は本発明を適用した高硬度耐摩耗性皮膜の形成方法の一例を説明するための模式図である。
第1の実施の形態では、先ず、炭素を含有する鉄鋼材料(例えば、普通鋼材、低合金鋼材、鋳鉄材等)から成る基材1の表面に大気中で純チタン粉末を溶射することでチタン溶射皮膜(以下、「チタン皮膜」と称する。)2を成膜する(図1(a)参照)。
以下、第1の実施の形態で形成した高硬度耐摩耗性皮膜の構造について説明を行う。
ところで、第1の実施の形態で形成した高硬度耐摩耗性皮膜の成長には、(1)基材の炭素含有量、(2)加熱温度、(3)加熱時間、の3つの要素が大きく影響していると考えられる。そこで、こうした因子が高硬度耐摩耗性皮膜の形成に及ぼす影響を確認すべく、表1に示す条件で高硬度耐摩耗性皮膜を形成し、断面の硬度及び膜厚の測定を行った。
この様に、炭素含有量が多いほど、保持時間が長いほどTiC膜厚は厚くなる。このことは、チタン皮膜へ移動する炭素量が基材からの供給により成り立つことを考慮すると、炭素を多く含む基材ほど長期的及び量的にも充分に炭素が拡散し、TiC膜厚が成長可能であることを意味する。
TiC膜厚が15μmとなる様に第1の実施の形態の方法で高硬度耐摩耗性皮膜を形成した試験片を用いて、また、最表層のTiO2は除去することなく、TiC皮膜の耐剥離性、耐打ち傷性、耐熱衝撃性及び耐滑り摩耗性についての評価を行った。以下、これらについて順に説明を行う。
耐剥離性の評価は曲げ試験により、TiC皮膜のき裂発生や剥離状態の評価を行った。具体的には、35mm×8mm×3mmの試験片の片側表面に皮膜を形成し、裏面の中央に深さ2mmのVノッチを入れ、皮膜に引張力が作用するように試験片の両側から曲げ荷重をかけた。そして、皮膜に変化が現れたときの角度を計測し、外観及び断面の状態を観察した。なお、比較材は高い耐摩耗性を有するMoB/CoCrの溶射膜を用いた。
図11に示す落重評価試験により耐打ち傷性の評価を行った。耐打ち傷性の評価は高さ4.2mから重さ30kgの重錘を試験片へ落下させ、そのときの落下痕の状態を観察し、変形量を測定して評価を行った。なお、重錘には凸部を設け、凸部を試験片に衝突させた。試験では鋳鉄焼入れ材と同じ基材にTiC成膜した試験片で比較を行った。
この様に、TiC皮膜を付加することで耐打ち傷性が向上することが分かる。
耐熱衝撃性の評価試験では、ガスバーナーで試験片を800℃まで加熱した後に素早く水冷し、皮膜のき裂の有無の調査を行った。加熱冷却の操作を5回繰り返し、その結果を図13に示している。図13から明らかな様に、5回繰り返し材においてき裂及び剥離は確認されず、試験前とほぼ変わらない皮膜を維持できており、良好な耐熱衝撃性を示すことが分かる。
図14に示す方法によりアブレシブ摩耗試験を行い、耐滑り摩耗性を評価した。なお、試験条件については表2に示す。
[2]TiC皮膜の硬度は2000HVと従来法により得られる皮膜に比べてやや劣るものの、基材との密着性は極めて高い。
[3]TiC皮膜があることで肌荒れやき裂の発生が抑制され、耐打ち傷性は飛躍的に向上する。
[4]耐熱衝撃性は800℃の熱衝撃試験でも割れや剥離もなく良好であった。
[5]耐滑り摩耗性においては、Ti2O層はさほど高い性能ではなかったが、TiC層のみでは優れた性能を有する。
[高硬度耐摩耗性皮膜の形成方法の他の一例]
上記した第1の実施の形態では、炭化チタン皮膜(TiC皮膜)4を形成する場合を例に挙げて説明を行っているが、第2の実施の形態では高硬度耐摩耗性皮膜としてTiCN膜を形成する場合について説明を行う。
[高硬度耐摩耗性皮膜の形成方法の更に他の一例]
上記した第2の実施の形態では、大気炉内に窒素を充填することによって窒素を供給しているが、第3の実施の形態では窒化処理によって窒素を供給する場合について説明を行う。
2 チタン溶射皮膜
3 酸素を排除可能な状態にした大気炉
4 炭化チタン皮膜
Claims (4)
- 炭素を含有する鉄鋼材料から成る基材の表面にチタン粉末を溶射してチタン皮膜を成膜する工程と、
酸素を排除可能な状態で前記チタン皮膜が成膜された前記基材を1000℃以上で12時間〜24時間加熱する工程とを備える
高硬度耐摩耗性皮膜の形成方法。 - 炭素を含有する鉄鋼材料から成る基材を窒化処理する工程と、
窒化処理が施された前記基材の表面にチタン粉末を溶射してチタン皮膜を成膜する工程と、
酸素を排除可能な状態で前記チタン皮膜が成膜された前記基材を1000℃以上で12時間〜24時間加熱する工程とを備える
高硬度耐摩耗性皮膜の形成方法。 - 前記加熱は、減圧環境下、不活性ガス環境下、若しくは、前記基材と前記チタン皮膜を酸化防止剤で被覆した状態で行う
請求項1または請求項2に記載の高硬度耐摩耗性皮膜の形成方法。 - 前記加熱により成膜された最表面のTiO 2 層の少なくとも一部を除去する工程を備える
請求項1、請求項2、または請求項3に記載の高硬度耐摩耗性皮膜の形成方法。
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JPS52116735A (en) * | 1976-03-29 | 1977-09-30 | Nippon Steel Corp | Method of forming anticorrosive film on surfaces of stainless steel articles |
JPS58157960A (ja) * | 1982-03-12 | 1983-09-20 | Mitsubishi Heavy Ind Ltd | 微細孔内表面の硬化処理法 |
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