JP2020045529A - Slide member - Google Patents
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- JP2020045529A JP2020045529A JP2018175256A JP2018175256A JP2020045529A JP 2020045529 A JP2020045529 A JP 2020045529A JP 2018175256 A JP2018175256 A JP 2018175256A JP 2018175256 A JP2018175256 A JP 2018175256A JP 2020045529 A JP2020045529 A JP 2020045529A
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- copper alloy
- sliding
- layer
- crystal grain
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- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 96
- 239000013078 crystal Substances 0.000 claims abstract description 63
- 241000357293 Leptobrama muelleri Species 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 8
- 239000012791 sliding layer Substances 0.000 claims description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 24
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 229910000398 iron phosphate Inorganic materials 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910017083 AlN Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 21
- 230000007797 corrosion Effects 0.000 abstract description 21
- JVEVIFRPMAXOFM-UHFFFAOYSA-N [Fe].[P]=O Chemical compound [Fe].[P]=O JVEVIFRPMAXOFM-UHFFFAOYSA-N 0.000 abstract description 12
- 239000012535 impurity Substances 0.000 abstract description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract 2
- 229910052737 gold Inorganic materials 0.000 abstract 2
- 239000010931 gold Substances 0.000 abstract 2
- 238000005245 sintering Methods 0.000 description 14
- 239000007791 liquid phase Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 4
- 239000005751 Copper oxide Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 229910000431 copper oxide Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910052745 lead Inorganic materials 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- 238000005486 sulfidation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 238000003703 image analysis method Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- AQKDYYAZGHBAPR-UHFFFAOYSA-M copper;copper(1+);sulfanide Chemical compound [SH-].[Cu].[Cu+] AQKDYYAZGHBAPR-UHFFFAOYSA-M 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical class [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Landscapes
- Sliding-Contact Bearings (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
本発明は、例えば内燃機関や自動変速機に用いられる軸受や各種機械に用いられる軸受などの摺動部材に関するものである。詳細には、本発明は、鋼裏金層上に形成された摺動層を備える摺動部材に係るものである。 The present invention relates to sliding members such as bearings used for internal combustion engines and automatic transmissions and bearings used for various machines. Specifically, the present invention relates to a sliding member including a sliding layer formed on a steel back metal layer.
従来から内燃機関や自動変速機等の軸受部には、銅合金の摺動層および鋼裏金層からなる摺動部材を円筒形状や半円筒形状に成形したすべり軸受などの摺動部材が用いられている。摺動部材の使用時、例えばすべり軸受の場合には摺動層の摺動面と軸部材との間の隙間に油が供給されるが、油中に含まれる硫黄成分により摺動層である銅合金の摺動面が硫化腐食を起こしやすい。そのため、摺動層の銅合金に、耐食性を高めるためＮｉを含有させる提案がなされている（特許文献１、２参照）。 Conventionally, sliding members such as sliding bearings in which a sliding member made of a copper alloy sliding layer and a steel backing metal layer are formed into a cylindrical or semi-cylindrical shape have been used for a bearing portion of an internal combustion engine or an automatic transmission. ing. When the sliding member is used, for example, in the case of a sliding bearing, oil is supplied to a gap between the sliding surface of the sliding layer and the shaft member, but the sliding layer is formed by a sulfur component contained in the oil. The sliding surface of copper alloy is susceptible to sulfidation corrosion. Therefore, it has been proposed to add Ni to the copper alloy of the sliding layer in order to enhance corrosion resistance (see Patent Documents 1 and 2).
特許文献１、２のＮｉを含有する銅合金からなる摺動層は、摺動部材の使用時、摺動層の摺動面での銅合金の硫化腐食は起き難くなるが、摺動面から内部に向かって銅合金の結晶粒界に沿って粒界腐食が起こる。これは、結晶粒界に沿って硫化腐食が進行するために生じるものである。この粒界腐食が銅合金の結晶粒界に沿って進行して摺動層の内部に達すると、摺動時に、結晶粒界が腐食した部分から、銅合金の結晶粒が個々に、あるいは、複数の結晶粒が一塊となって脱落し、摺動層の摺動面と相手軸表面との間に入り、摺動層の摺動面が傷つき損傷する。 The sliding layer made of a copper alloy containing Ni described in Patent Documents 1 and 2 is less likely to cause sulfidation corrosion of the copper alloy on the sliding surface of the sliding layer when the sliding member is used. Grain boundary corrosion occurs along the grain boundaries of the copper alloy toward the inside. This is caused by the progress of sulfide corrosion along the crystal grain boundaries. When this intergranular corrosion progresses along the crystal grain boundaries of the copper alloy and reaches the inside of the sliding layer, during sliding, the crystal grains of the copper alloy individually or from the portion where the crystal grain boundaries are corroded, or A plurality of crystal grains fall off as one lump, enter between the sliding surface of the sliding layer and the surface of the mating shaft, and the sliding surface of the sliding layer is damaged and damaged.
本発明は、このような従来技術の問題を解決して、耐食性（耐粒界腐食性）に優れ、銅合金の結晶粒の脱落による損傷が起き難い摺動部材の提供を目的とする。 An object of the present invention is to solve such a problem of the prior art and to provide a sliding member which is excellent in corrosion resistance (intergranular corrosion resistance) and is less likely to be damaged by falling off of copper alloy crystal grains.
本発明によれば、鋼裏金層と、鋼裏金層上に設けられ摺動面を有する摺動層とを備えた摺動部材が提供される。摺動層は、１〜１２質量％のＳｎ、１〜１５質量％のＮｉ、０．０１〜０．２質量％のＰを含み、残部がＣｕ及び不可避純物からなる銅合金部と、銅合金部の銅合金結晶の結晶粒界に存在する鉄リン酸化物とを有する。 According to the present invention, there is provided a sliding member including a steel back metal layer and a sliding layer provided on the steel back metal layer and having a sliding surface. The sliding layer contains 1 to 12% by mass of Sn, 1 to 15% by mass of Ni, and 0.01 to 0.2% by mass of P, with the balance being Cu and an inevitable pure copper alloy portion; And iron phosphate present at the crystal grain boundaries of the copper alloy crystal in the alloy portion.
本発明の一具体例によれば、鉄リン酸化物における、ＦｅとＰとＯの質量比は、Ｆｅ１−Ｘ−ＹＰＸＯＹであり、ここでＸ＝０．１〜０．３、Ｙ＝０．３〜０．６５であることが好ましい。 According to one embodiment of the present invention, the mass ratio of Fe, P and O in the iron phosphate is Fe 1- XYP X O Y , where X = 0.1 to 0.3. , Y = 0.3 to 0.65.
本発明の一具体例によれば、銅合金部の結晶粒界における鉄リン酸化物の数割合は、結晶粒界の長さ５０μｍあたり１個以上であることが好ましい。 According to one embodiment of the present invention, it is preferable that the number ratio of iron phosphate in the crystal grain boundary of the copper alloy part is one or more per 50 μm of the length of the crystal grain boundary.
本発明の一具体例によれば、銅合金部は、０．０１〜５質量％のＡｌ、０．０１〜５質量％のＳｉ、０．５〜１０質量％のＦｅ、０．１〜５質量％のＭｎ、０．１〜３０質量％のＺｎ、０．１〜５質量％のＳｂ、０．１〜５質量％のＩｎ、０．１〜５質量％のＡｇ、０．５〜２５質量％のＰｂ、０．５〜２０質量％のＢｉから選ばれる１種以上をさらに含むことが好ましい。 According to one embodiment of the present invention, the copper alloy part comprises 0.01 to 5% by mass of Al, 0.01 to 5% by mass of Si, 0.5 to 10% by mass of Fe, 0.1 to 5% by mass. Wt% Mn, 0.1-30 wt% Zn, 0.1-5 wt% Sb, 0.1-5 wt% In, 0.1-5 wt% Ag, 0.5-25 It is preferable that the composition further contains at least one member selected from the group consisting of Pb at 0.5% by mass and Bi at 0.5 to 20% by mass.
本発明の一具体例によれば、摺動層は、Ａｌ２Ｏ３、ＳｉＯ２、ＡｌＮ、Ｍｏ２Ｃ、ＷＣ、Ｆｅ２Ｐ、Ｆｅ３Ｐのうちから選ばれる１種以上の硬質粒子を０．１〜１０体積％をさらに含むことが好ましい。 According to one embodiment of the present invention, the sliding layer includes one or more hard particles selected from Al 2 O 3 , SiO 2 , AlN, Mo 2 C, WC, Fe 2 P, and Fe 3 P. It is preferable to further contain 0.1 to 10% by volume.
図１に本発明による摺動部材１の一具体例の断面を模式的に示す。この摺動部材１は、鋼裏金層２上に摺動層３が設けられた構成となっている。鋼裏金層２とは反対側の摺動層３の表面が摺動面３１を形成している。なお、摺動部材１は摺動層上に金属または合金からなる被覆層や、合成樹脂または合成樹脂を基とする被覆層を有してもよいが、被覆層の有無に関わらず本明細書では摺動層３の上記表面を摺動面３１と称する。
図２に図１に示す摺動層３の組織を示す。摺動層３は、銅合金部４からなり、その組織は多数の銅合金の結晶粒４１からなっており、結晶粒４１どうしの界面には結晶粒界４２が存在する。図３に、図２に示す銅合金部４の組織の拡大図を示す。結晶粒界４２には、多数の鉄リン酸化物６が存在している。なお、図３では、鉄リン酸化物６は、理解を容易にするために、誇張して描かれている。
FIG. 1 schematically shows a cross section of a specific example of the sliding member 1 according to the present invention. The sliding member 1 has a configuration in which a sliding layer 3 is provided on a steel backing metal layer 2. The surface of the sliding layer 3 opposite to the steel back metal layer 2 forms a sliding surface 31. The sliding member 1 may have a coating layer made of a metal or an alloy or a coating layer based on a synthetic resin or a synthetic resin on the sliding layer. In the description, the surface of the sliding layer 3 is referred to as a sliding surface 31.
FIG. 2 shows the structure of the sliding layer 3 shown in FIG. The sliding layer 3 is composed of a copper alloy part 4, and its structure is composed of a large number of crystal grains 41 of a copper alloy, and a crystal grain boundary 42 exists at an interface between the crystal grains 41. FIG. 3 shows an enlarged view of the structure of the copper alloy part 4 shown in FIG. Many iron phosphorus oxides 6 exist in the crystal grain boundaries 42. In FIG. 3, the iron phosphorus oxide 6 is exaggerated for easy understanding.
鋼裏金層２は、例えば、炭素の含有量が０．０７〜０．３５質量％である亜共析鋼である。なお、鋼裏金層２は、０．０７〜０．３５質量％の炭素を含有し、さらに、０．４質量％以下のＳｉ、１質量％以下のＭｎ、０．０４質量％以下のＰ、０．０５質量％以下のＳのいずれか一種以上を含有し、残部Ｆｅおよび不可避不純物からなる組成であってもよい。 The steel back metal layer 2 is, for example, a hypoeutectoid steel having a carbon content of 0.07 to 0.35% by mass. In addition, the steel back metal layer 2 contains 0.07 to 0.35% by mass of carbon, and further contains 0.4% by mass or less of Si, 1% by mass or less of Mn, and 0.04% by mass or less of P, The composition may contain at least one of S in an amount of 0.05% by mass or less and the balance may be composed of Fe and unavoidable impurities.
銅合金部４の組成は、１〜１２質量％のＳｎ、１〜１５質量％のＮｉ、０．０１〜０．２質量％のＰを含み残部Ｃｕ及び不可避純物からなるものでよい。
銅合金部４の組成中のＳｎ成分は、銅合金部４自体の強度を高めるが、含有量が１質量％未満では、この効果が不十分であり、また、含有量が１２質量％を超えると、銅合金部４が脆くなる。Ｎｉ成分は、銅合金部４の耐食性を高める成分として作用するが、含有量が１質量％未満では、この効果が不十分であり、また、含有量が１５質量％を超えると、銅合金部４が脆くなる。銅合金部４のＰ成分は、銅合金部４自体の強度を高めるが、含有量が０．０１質量％未満では、この効果が不十分であり、また、含有量が０．２質量％を超えると、銅合金が脆くなる。銅合金部４のＰ成分の含有量は、０．０５質量％以上、０．１５質量％以下であることが、より好ましい。このＮｉ成分、Ｐ成分は、後述する銅合金部４の結晶粒界４２の鉄リン酸化物６の分散に影響する。
The composition of the copper alloy part 4 may be composed of 1 to 12% by mass of Sn, 1 to 15% by mass of Ni, 0.01 to 0.2% by mass of P, the balance being Cu and unavoidable pure substances.
The Sn component in the composition of the copper alloy part 4 enhances the strength of the copper alloy part 4 itself, but if the content is less than 1% by mass, this effect is insufficient, and the content exceeds 12% by mass. Then, the copper alloy part 4 becomes brittle. The Ni component acts as a component that enhances the corrosion resistance of the copper alloy part 4. However, if the content is less than 1% by mass, this effect is insufficient, and if the content exceeds 15% by mass, the copper alloy part is not. 4 becomes brittle. The P component of the copper alloy part 4 enhances the strength of the copper alloy part 4 itself, but if the content is less than 0.01% by mass, this effect is insufficient, and the content is 0.2% by mass. If it exceeds, the copper alloy becomes brittle. More preferably, the content of the P component in the copper alloy portion 4 is 0.05% by mass or more and 0.15% by mass or less. The Ni component and the P component affect the dispersion of the iron phosphate 6 in the crystal grain boundaries 42 of the copper alloy part 4 described later.
なお、銅合金部４は、上記組成にさらに０．０１〜５質量％のＡｌ、０．０１〜５質量％のＳｉ、０．５〜１０質量％のＦｅ、０．１〜５質量％のＭｎ、０．１〜３０質量％のＺｎ、０．１〜５質量％のＳｂ、０．１〜５質量％のＩｎ、０．１〜５質量％のＡｇ、０．５〜２５質量％のＰｂ、０．５〜２０質量％のＢｉから選ばれる１種以上を含むことができる。これら選択成分のうち、Ｂｉ成分、Ｐｂ成分を除く成分は、銅合金部４の強度を高め、Ｂｉ成分およびＰｂ成分は、銅合金部４の潤滑性を高める成分である。これら選択成分を２種以上含有する場合でも、選択成分の合計の含有量は４０質量％以下とすることが好ましい。また、銅合金部４は、原材料として用いる銅合金（粉末）の製造時より含まれる不可避不純物も含有してもよい。 In addition, the copper alloy part 4 further contains 0.01 to 5% by mass of Al, 0.01 to 5% by mass of Si, 0.5 to 10% by mass of Fe, and 0.1 to 5% by mass of the composition. Mn, 0.1 to 30 mass% Zn, 0.1 to 5 mass% Sb, 0.1 to 5 mass% In, 0.1 to 5 mass% Ag, 0.5 to 25 mass% Pb may contain one or more selected from Bi of 0.5 to 20% by mass. Among these selected components, components other than the Bi component and the Pb component increase the strength of the copper alloy portion 4, and the Bi component and the Pb component increase the lubricity of the copper alloy portion 4. Even when two or more of these optional components are contained, the total content of the optional components is preferably 40% by mass or less. In addition, the copper alloy part 4 may also contain unavoidable impurities that are included in the production of the copper alloy (powder) used as a raw material.
摺動層３は、さらに、Ａｌ２Ｏ３、ＳｉＯ２、ＡｌＮ、Ｍｏ２Ｃ、ＷＣ、Ｆｅ２Ｐ、Ｆｅ３Ｐから選ばれる１種以上の硬質粒子を０．１〜１０体積％を含むことができる。これら硬質粒子は、摺動層３の銅合金部４の素地に分散して摺動層３の耐摩耗性を高めるが、含有量が０．１体積％未満の場合には、その効果が不十分であり、また、１０体積％を超える場合には、摺動層３が脆くなる。 The sliding layer 3 further contains 0.1 to 10% by volume of one or more hard particles selected from Al 2 O 3 , SiO 2 , AlN, Mo 2 C, WC, Fe 2 P, and Fe 3 P. be able to. These hard particles are dispersed in the base material of the copper alloy portion 4 of the sliding layer 3 to increase the wear resistance of the sliding layer 3, but when the content is less than 0.1% by volume, the effect is not sufficient. If it is sufficient and exceeds 10% by volume, the sliding layer 3 becomes brittle.
空孔が摺動層３の銅合金部４中に形成されてもよいが、摺動層３は、緻密にすることが好ましく、その場合、摺動層３中の空孔（図示しない）の体積割合を０．１体積％未満とすることが好ましい。空孔は、摺動層３の銅合金部４中にも形成されることがあるが、空孔の体積割合が０．１体積％未満であると、空孔の体積割合が０．１体積％以上である場合よりも、銅合金部４の強度が高くなり摺動層３の耐摩耗性に優れる。 Although holes may be formed in the copper alloy portion 4 of the sliding layer 3, it is preferable that the sliding layer 3 be dense, in which case holes (not shown) in the sliding layer 3 are formed. Preferably, the volume ratio is less than 0.1% by volume. Voids may also be formed in the copper alloy part 4 of the sliding layer 3, but if the volume ratio of the pores is less than 0.1% by volume, the volume ratio of the pores is 0.1% by volume. %, The strength of the copper alloy part 4 is higher and the sliding layer 3 is superior in wear resistance.
ここで、摺動層３の体積に対する空孔の総体積の割合の測定方法を具体的に説明する。
上記の摺動層３の摺動面３１に垂直方向の断面の複数箇所（例えば５箇所）を、電子顕微鏡を用いて電子像を例えば２００倍で撮影し、得られた電子像を一般的な画像解析手法（解析ソフト：Ｉｍａｇｅ−Ｐｒｏ Ｐｌｕｓ（Ｖｅｒｓｉｏｎ４．５）；（株）プラネトロン製）を用いて、画像中の摺動層３（銅合金部４および空孔）の面積の合計（Ａ１）に対する空孔の合計の面積（Ａ２）の比（Ａ２／Ａ１）から求める。なお、この面積の比の値は、摺動層中に含まれる空孔の体積割合に相当する。
ただし、上記の電子像の撮影倍率は、２００倍に限定されないで、他の倍率に変更することができる。
Here, a method for measuring the ratio of the total volume of the holes to the volume of the sliding layer 3 will be specifically described.
Electron images of a plurality of sections (for example, 5 places) of a cross section perpendicular to the sliding surface 31 of the sliding layer 3 are taken with an electron microscope at a magnification of, for example, 200 times, and the obtained electronic images are generally used. Using an image analysis method (analysis software: Image-Pro Plus (Version 4.5); manufactured by Planetron Co., Ltd.), the total area of the sliding layer 3 (copper alloy portion 4 and pores) in the image (A1) From the ratio (A2 / A1) of the total area of the holes (A2) to The value of the area ratio corresponds to the volume ratio of the holes contained in the sliding layer.
However, the photographing magnification of the electronic image is not limited to 200 times, but can be changed to another magnification.
銅合金部４の結晶粒４１どうしの間の結晶粒界４２には、鉄リン酸化物６が形成されている。
なお、結晶粒界４２における鉄リン酸化物６の形成は、摺動部材１の摺動層３の摺動面３１に垂直方向の断面を、ＥＰＭＡ（電子線マイクロアナライザー）を用い、複数の結晶粒界４２部の面分析を行い結晶粒界４２部におけるＦｅ元素、Ｐ元素、Ｏ元素を検出することにより確認できる。
そして、鉄リン酸化物６におけるＦｅ元素とＰ元素とＯ元素の質量比は、Ｆｅ１−Ｘ−ＹＰＸＯＹで表現した場合にＸ＝０．１〜０．３、Ｙ＝０．３〜０．６５であることが好ましい（数値は質量比である）。
鉄リン酸化物６におけるＦｅとＰとＯの組成の質量比は、ＥＰＭＡを用い、倍率５０００倍で上記断面組織中の摺動層３の厚さ方向の中央部付近の複数の鉄リン酸化物６の定量分析を行うことで確認できる。定量分析における検出元素としてＦｅ、ＰおよびＯを選択し、これら元素の特性Ｘ線強度をＺＡＦ補正計算法により質量濃度に変換し、このＦｅ、ＰおよびＯの質量濃度から算出した組成の質量比の値を算術平均することで確認できる。なお、定量分析における倍率は５０００倍に限定されないで、例えば５０００倍を超える倍率で行なってもよい。
Iron phosphate 6 is formed in a crystal grain boundary 42 between crystal grains 41 of copper alloy part 4.
The formation of the iron phosphorus oxide 6 in the crystal grain boundary 42 is performed by using a cross section perpendicular to the sliding surface 31 of the sliding layer 3 of the sliding member 1 by using an EPMA (electron beam microanalyzer) to form a plurality of crystals. It can be confirmed by performing a surface analysis of the grain boundary 42 part and detecting the Fe element, the P element, and the O element in the crystal grain boundary 42 part.
The mass ratio of the Fe element, the P element, and the O element in the iron phosphorus oxide 6 is represented by X = 0.1 to 0.3 and Y = 0.0.3 when represented by Fe 1-XY P X O Y. It is preferably from 3 to 0.65 (the numerical value is a mass ratio).
The mass ratio of the composition of Fe, P and O in the iron phosphate 6 was determined by using EPMA at a magnification of 5,000 and a plurality of iron phosphates near the center in the thickness direction of the sliding layer 3 in the sectional structure. It can be confirmed by performing the quantitative analysis of No. 6. Fe, P, and O are selected as detection elements in the quantitative analysis, and the characteristic X-ray intensity of these elements is converted into a mass concentration by a ZAF correction calculation method, and the mass ratio of the composition calculated from the mass concentrations of the Fe, P, and O Can be confirmed by arithmetically averaging the values of In addition, the magnification in the quantitative analysis is not limited to 5000 times, but may be performed at a magnification exceeding 5000 times, for example.
銅合金部４の結晶粒界４２における鉄リン酸化物６の数割合は、結晶粒界の長さ５０μｍあたり１個以上であることが好ましく、結晶粒界の長さ３０μｍあたり１個以上であることがより好ましい。 The number ratio of the iron phosphate 6 in the crystal grain boundaries 42 of the copper alloy part 4 is preferably one or more per 50 μm length of the crystal grain boundaries, and is one or more per 30 μm length of the crystal grain boundaries. Is more preferable.
銅合金４の結晶粒界４２における鉄リン酸化物６の数割合の測定は、上記の手法で得られた電子像を、上記の画像解析手法を用いる。上記電子像中の複数の銅合金の結晶４１の結晶粒界４２上の鉄リン酸化物６の個数Ｘおよび結晶粒界４２の長さＬを測定する。そして、各結晶粒界４２上の鉄リン酸化物６の個数Ｘと結晶粒界４２の長さ（周囲長）Ｌの比（Ｘ／Ｌ）を求め、それらの平均を算出して、銅合金４の結晶粒界４２における鉄リン酸化物６の数割合とする。 The measurement of the number ratio of the iron phosphorus oxides 6 in the crystal grain boundaries 42 of the copper alloy 4 uses the above-described image analysis method for the electron image obtained by the above-described method. The number X of the iron phosphorus oxides 6 on the crystal grain boundaries 42 of the plurality of copper alloy crystals 41 in the electronic image and the length L of the crystal grain boundaries 42 are measured. Then, the ratio (X / L) of the number X of the iron phosphorus oxides 6 on each of the crystal grain boundaries 42 and the length (perimeter) L of the crystal grain boundaries 42 is determined, and the average thereof is calculated. 4 is the number ratio of iron phosphorus oxide 6 in the crystal grain boundary 42.
図４を用いて従来のＮｉを含む銅合金からなる摺動層１３を有する摺動部材に生じる粒界腐食を説明する。従来の摺動部材は、摺動時、油中に含まれる硫黄成分により、摺動層１３の摺動面１３１に露出する銅合金の結晶粒界１４２を起点とし、摺動層１３１から内部に向かって銅合金の結晶粒界１４２に沿って腐食（硫化腐食）が進行する粒界腐食が起こる。摺動層の内部、特に摺動面付近では、銅合金結晶１４１の結晶粒界１４２に沿って腐食生成物（Ｃｕ２Ｓ）７がネットワークを形成する。
結晶粒界１４２の全部または大部分が腐食すると、銅合金結晶粒１４１どうしの間の結合が弱まり、銅合金結晶粒１４１が個々に、あるいは、複数の銅合金結晶粒１４１が一塊となり、摺動層１３の摺動面１３１と相手軸８表面との間に脱落し、摺動層１３の摺動面１３１が傷つき損傷する。
Ｎｉを含有する銅合金の粒界腐食の機構は、明らかになっていないが、この粒界腐食による生成物は、硫化銅（Ｃｕ２Ｓ）であり、油中に含まれるＳ成分と銅合金の結晶粒界１４２および結晶粒界１４２に近接する銅合金結晶粒１４１のＣｕ成分とが反応したものと考えられる。
Referring to FIG. 4, intergranular corrosion occurring in a conventional sliding member having a sliding layer 13 made of a copper alloy containing Ni will be described. In the conventional sliding member, at the time of sliding, the sulfur component contained in the oil starts from the crystal grain boundary 142 of the copper alloy exposed on the sliding surface 131 of the sliding layer 13 and moves from the sliding layer 131 to the inside. Grain boundary corrosion in which corrosion (sulfurization corrosion) progresses along the crystal grain boundaries 142 of the copper alloy toward the surface. Inside the sliding layer, especially near the sliding surface, the corrosion product (Cu 2 S) 7 forms a network along the crystal grain boundaries 142 of the copper alloy crystal 141.
When all or most of the crystal grain boundaries 142 are corroded, the bond between the copper alloy crystal grains 141 is weakened, and the copper alloy crystal grains 141 individually or a plurality of the copper alloy crystal grains 141 are aggregated to form a slide. The sliding surface 131 of the sliding layer 13 falls off between the sliding surface 131 of the layer 13 and the surface of the mating shaft 8 and is damaged.
The mechanism of intergranular corrosion of the copper alloy containing Ni is not clear, but the product of this intergranular corrosion is copper sulfide (Cu 2 S), and the S component contained in the oil and the copper alloy It is considered that the crystal grain boundary 142 and the Cu component of the copper alloy crystal grain 141 adjacent to the crystal grain boundary 142 have reacted.
他方、本発明の摺動部材１の摺動層３の銅合金部４は、多数の結晶粒４１を有しており、結晶粒４１どうしの間の界面は結晶粒界４２部を形成している。多数の鉄リン酸化物６は主に結晶粒界４２部に存在している。この鉄リン酸化物６は、硫化腐食を生じにくい。このため、本発明の摺動部材１は、摺動時、摺動層３の摺動面に露出する銅合金の結晶粒界４２を起点として油中に含まれるＳ成分による腐食が摺動層３の内部に向かって銅合金の結晶粒界４２に沿って進行しても、銅合金の結晶粒界４２に存在する鉄リン酸化物６に達すると、腐食の進行が停止し、銅合金の結晶粒界４２へのさらなる拡散が抑制される。したがって、摺動層３の内部に粒界腐食部７のネットワークが形成され難く、摺動時に摺動層３の銅合金の結晶粒４１の脱落が防がれる。 On the other hand, the copper alloy part 4 of the sliding layer 3 of the sliding member 1 of the present invention has a large number of crystal grains 41, and the interface between the crystal grains 41 forms a crystal grain boundary 42 part. I have. Many iron phosphorus oxides 6 are mainly present at the crystal grain boundary 42 part. The iron phosphorus oxide 6 is unlikely to cause sulfidation corrosion. For this reason, in the sliding member 1 of the present invention, when sliding, the corrosion by the S component contained in the oil starting from the crystal grain boundary 42 of the copper alloy exposed on the sliding surface of the sliding layer 3 causes 3, the corrosion of the copper alloy is stopped when the iron phosphate 6 present at the crystal grain boundary 42 of the copper alloy is reached even if the copper alloy proceeds along the crystal grain boundary 42 of the copper alloy. Further diffusion to the crystal grain boundaries 42 is suppressed. Therefore, a network of intergranular corrosion portions 7 is hardly formed inside the sliding layer 3, and the sliding of the copper alloy crystal grains 41 of the sliding layer 3 during sliding is prevented.
以下に、本実施形態に係る摺動部材の作製方法について説明する。 Hereinafter, a method for manufacturing the sliding member according to the present embodiment will be described.
まず、摺動層の上記組成の銅合金の粉末を準備する。また、摺動層に上記硬質粒子を含有させる場合は、銅合金粉末と硬質粒子との混合粉を作製する。 First, a powder of a copper alloy having the above composition for the sliding layer is prepared. When the hard particles are contained in the sliding layer, a mixed powder of the copper alloy powder and the hard particles is prepared.
準備した銅合金粉末または混合粉を鋼（例えば亜共析鋼）板上に散布した後、粉末散布層を加圧することなく、焼結炉を用いて８５０〜９８０℃の還元雰囲気で１次焼結を行い、鋼板上に空孔率が２７〜３８体積％の多孔質銅合金層を形成し、８０〜３５０℃まで冷却した後、大気雰囲気中で室温まで冷却する。この工程により、多孔質銅合金層の銅合金の表面に厚さが１０〜１２０ｎｍの銅酸化膜（Ｃｕ２Ｏ）を形成する。１次焼結後の多孔質銅合金層は、各空孔がネットワークを形成した組織である。
代替の方法としては、１次焼結の冷却工程にて還元雰囲気で部材を室温まで冷却したのち、大気雰囲気中で部材を８０〜３５０℃の温度に加熱し、多孔質銅合金層の銅合金の表面に銅酸化膜（Ｃｕ２Ｏ）を形成してもよい。
After the prepared copper alloy powder or mixed powder is sprayed on a steel (for example, hypoeutectoid steel) plate, primary firing is performed in a reducing atmosphere at 850 to 980 ° C. using a sintering furnace without applying pressure to the powder spray layer. After sintering, a porous copper alloy layer having a porosity of 27 to 38% by volume is formed on the steel sheet, cooled to 80 to 350 ° C., and then cooled to room temperature in an air atmosphere. By this step, a copper oxide film (Cu 2 O) having a thickness of 10 to 120 nm is formed on the surface of the copper alloy of the porous copper alloy layer. The porous copper alloy layer after the first sintering has a structure in which each pore forms a network.
As an alternative method, the member is cooled to room temperature in a reducing atmosphere in a cooling step of the primary sintering, and then the member is heated to a temperature of 80 to 350 ° C. in an air atmosphere to form a copper alloy of the porous copper alloy layer. A copper oxide film (Cu 2 O) may be formed on the surface of the substrate.
次に、多孔質銅合金層を緻密化させるための１次圧延を行う。この場合、空孔率が０．１体積％未満とすることが好ましい。 Next, primary rolling is performed to densify the porous copper alloy layer. In this case, the porosity is preferably less than 0.1% by volume.
次に、圧延された部材は、焼結炉を用いて８５０〜９８０℃の還元雰囲気で２次焼結を行い、銅合金層をさらに焼結した後、室温まで冷却する。２次焼結での炉内の還元雰囲気の温度は、銅合金の固相線温度を超え液相線温度よりも低くする。１次圧延にて銅合金層を緻密化しているため、銅合金層の内部の上記銅酸化膜（Ｃｕ２Ｏ）は、この２次焼結での還元雰囲気により還元されることはない。 Next, the rolled member is subjected to secondary sintering in a reducing atmosphere at 850 to 980 ° C. using a sintering furnace, further sintering the copper alloy layer, and then cooling to room temperature. The temperature of the reducing atmosphere in the furnace in the secondary sintering is higher than the solidus temperature of the copper alloy and lower than the liquidus temperature. Since the copper alloy layer is densified by the primary rolling, the copper oxide film (Cu 2 O) inside the copper alloy layer is not reduced by the reducing atmosphere in the secondary sintering.
この２次焼結にて、銅合金部４の結晶粒界４２部に鉄リン酸化物が形成される。この生成過程は不明であるが、次のように考える。
２次焼結の昇温の過程で、部材の温度が、銅合金の固相線温度に超えてから最大温度に達するまでの間は、銅合金の一部が液相となる。この液相は、１次焼結後の多孔質銅合金層の表面であった部分で発生し、この液相に銅酸化膜の酸素成分が拡散する。次に、この銅合金の液相中のＮｉ、Ｐ成分の一部が、鋼裏金層の表面に拡散し、鋼裏金層のＦｅ成分が銅合金の液相中に拡散する。
この酸素成分およびＦｅ成分が拡散した銅合金の液相は、１次圧延にて形成された銅合金の表面どうしの間の僅かな隙間を毛細間現象により流動し、摺動層の表面（摺動面）に近い付近にまで達するが、流動する際に、銅合金の液相中の酸素成分およびＦｅ成分濃度が均一化すると考えられる。
By this secondary sintering, iron phosphorous oxide is formed at the crystal grain boundaries 42 of the copper alloy portion 4. Although the generation process is unknown, it is considered as follows.
In the process of raising the temperature of the secondary sintering, a part of the copper alloy is in a liquid phase until the temperature of the member reaches the maximum temperature after exceeding the solidus temperature of the copper alloy. This liquid phase is generated in the portion that was the surface of the porous copper alloy layer after the first sintering, and the oxygen component of the copper oxide film diffuses into this liquid phase. Next, a part of the Ni and P components in the liquid phase of the copper alloy diffuses to the surface of the steel back metal layer, and the Fe component of the steel back metal layer diffuses into the liquid phase of the copper alloy.
The liquid phase of the copper alloy in which the oxygen component and the Fe component are diffused flows through a slight gap between the surfaces of the copper alloy formed by the primary rolling by a capillary phenomenon, and the surface of the sliding layer (sliding layer). It is thought that the concentration of the oxygen component and the Fe component in the liquid phase of the copper alloy becomes uniform when the copper alloy flows.
部材が焼結温度（最大温度）に達する頃には、上記の１次圧延にて形成された銅合金どうしの間の僅かな隙間は、銅合金の液相により満たされるようになる。部材が焼結温度（最大温度）に達した後の冷却の過程で、Ｆｅ成分、酸素成分を含む銅合金の液相は、銅合金部４の結晶粒界４２部で固化するが、その固化が完全に完了する前に液相中に鉄リン酸化物が晶出し、または、完全に固化した後に鉄リン酸化物が析出し、銅合金部４の結晶粒界４２に鉄リン酸化物６が存在すると考えられる。
なお、摺動層の銅合金の結晶４１中にも、僅かに鉄リン酸化物や鉄リン化合物が確認されることもある。
By the time the member reaches the sintering temperature (maximum temperature), the slight gap between the copper alloys formed by the primary rolling is filled with the liquid phase of the copper alloy. In the course of cooling after the member reaches the sintering temperature (maximum temperature), the liquid phase of the copper alloy containing the Fe component and the oxygen component solidifies at the crystal grain boundaries 42 of the copper alloy portion 4. Iron phosphate is crystallized in the liquid phase before the completion is complete, or iron phosphate is precipitated after complete solidification, and iron phosphate 6 is formed at the crystal grain boundaries 42 of the copper alloy part 4. It is thought to exist.
In addition, in the copper alloy crystal 41 of the sliding layer, iron phosphorus oxides and iron phosphorus compounds may be slightly observed.
本発明の摺動部材は、内燃機関や自動変速機に用いられる軸受に限定されないで、各種機械に用いられる軸受に適用できる。また、軸受の形状は、円筒形状や半円筒形状に限定されないで、例えば、軸部材の軸線方向負荷を支承する円環形状や半円環形状のスラスト軸受や、自動変速機のクラッチ部（ワンウェイクラッチ）に用いられる略コ字状断面を有する円環形状のエンドプレート等にも適用できる。 The sliding member of the present invention is not limited to a bearing used for an internal combustion engine or an automatic transmission, but can be applied to a bearing used for various machines. Further, the shape of the bearing is not limited to a cylindrical shape or a semi-cylindrical shape. The present invention can also be applied to an annular end plate having a substantially U-shaped cross section used for a clutch).
なお、本発明の摺動部材は、摺動層および／または裏金層の表面にＳｎ、Ｂｉ、Ｐｂまたは、これら金属を基とする合金からなる被覆層や、合成樹脂または合成樹脂を基とする被覆層を有してもよい。 The sliding member of the present invention is based on a coating layer made of Sn, Bi, Pb or an alloy based on these metals, a synthetic resin or a synthetic resin on the surface of the sliding layer and / or the back metal layer. It may have a coating layer.
Claims (5)
前記鋼裏金層上に設けられ、摺動面を有する摺動層と
を備えた摺動部材であって、
前記摺動層は、
１〜１２質量％のＳｎ、１〜１５質量％のＮｉ、０．０１〜０．２質量％のＰを含み、残部がＣｕ及び不可避純物からなる銅合金部と
前記銅合金部の銅合金結晶の結晶粒界に存在する鉄リン酸化物と
を有する、摺動部材。 Steel back metal layer,
A sliding member provided on the steel backing metal layer and having a sliding layer having a sliding surface,
The sliding layer,
A copper alloy part containing 1 to 12% by mass of Sn, 1 to 15% by mass of Ni, and 0.01 to 0.2% by mass of P, with the balance being Cu and inevitable pure substances; A sliding member comprising: iron phosphate present at a crystal grain boundary of a crystal.
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| JP2018175256A JP6794412B2 (en) | 2018-09-19 | 2018-09-19 | Sliding member |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2589723A (en) * | 2019-09-26 | 2021-06-09 | Daido Metal Co | Sliding member |
| CN115261669A (en) * | 2022-07-27 | 2022-11-01 | 宁波金田铜业(集团)股份有限公司 | Tin-lead bronze bar and preparation method thereof |
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| GB2589723B (en) * | 2019-09-26 | 2021-12-15 | Daido Metal Co | Sliding member |
| EP4289980A1 (en) * | 2022-06-09 | 2023-12-13 | Otto Fuchs - Kommanditgesellschaft - | Brass alloy product and method for producing such a brass alloy product |
| CN115261669A (en) * | 2022-07-27 | 2022-11-01 | 宁波金田铜业(集团)股份有限公司 | Tin-lead bronze bar and preparation method thereof |
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