JPH0465A - Piston ring - Google Patents
Piston ringInfo
- Publication number
- JPH0465A JPH0465A JP9988490A JP9988490A JPH0465A JP H0465 A JPH0465 A JP H0465A JP 9988490 A JP9988490 A JP 9988490A JP 9988490 A JP9988490 A JP 9988490A JP H0465 A JPH0465 A JP H0465A
- Authority
- JP
- Japan
- Prior art keywords
- base
- sprayed
- coating
- thermal
- alloy powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011248 coating agent Substances 0.000 claims abstract description 41
- 238000000576 coating method Methods 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 14
- 229910000592 Ferroniobium Inorganic materials 0.000 claims abstract description 11
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 40
- 238000005507 spraying Methods 0.000 description 10
- 239000007921 spray Substances 0.000 description 7
- 239000002344 surface layer Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000007751 thermal spraying Methods 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910003192 Nb–Ta Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- 229910001203 Alloy 20 Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- 229910000943 NiAl Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は溶射ピストンリングに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to thermal spray piston rings.
ピストンリングの外周面に溶射皮膜を形成したものは知
られており、通常Ｍｏ以外の溶射材を使用する場合は、
母材との密着性を良好にするために、表層部の溶射皮膜
の下に下地溶射皮膜を設ける。この場合、通常、ピスト
ンリングの外周面に浅い凹溝を全周にわたって形成し、
その溝内の全表面に下地溶射皮膜を設け、その溝内に表
層部の溶射材を溶着して形成する。Piston rings with a thermally sprayed coating formed on the outer circumferential surface are known, and when using a thermally sprayed material other than Mo,
In order to improve adhesion to the base material, a base sprayed coating is provided below the surface sprayed coating. In this case, usually a shallow groove is formed on the outer circumferential surface of the piston ring,
A base thermal spray coating is provided on the entire surface within the groove, and the thermal spray material for the surface layer is welded into the groove.
そして、従来、例えばＮ１−Ａｆｆｉ下地溶射材が使用
されて、内燃機関用エンジンで一定の効果を出したが、
高負荷化する中では不充分で、ＮｉＡｌ下地溶射皮膜が
層内剥離することがある。Conventionally, for example, N1-Affi base thermal spraying material has been used and has achieved certain effects in internal combustion engines.
This is insufficient under high loads, and the NiAl base thermal spray coating may peel off within the layer.
また、Ｎｉ−Ａｍ！下地溶射材は、５〜１０％ＡｌとＮ
ｉであるため、硬度がＨｖ２００程度と低く耐摩耗性に
乏しい欠点があり、外周面に露出したＮｉ −Ａｊ！下
地溶射皮膜は燃焼生成硬質粉によって容易に摩耗して、
外周面において母材と表層部の溶射皮膜との間に段付摩
耗を生し、その凹部が切欠作用となり耐剥離性が劣化し
、またこの凹部部分のエツジ部がンリンダ壁面を異常に
加速摩耗させることがある。Also, Ni-Am! The base thermal spray material is 5-10% Al and N.
Since it is Ni-Aj, it has a low hardness of about Hv200 and poor wear resistance, and Ni-Aj! The base thermal spray coating is easily worn away by the hard powder produced by combustion.
On the outer circumferential surface, stepped wear occurs between the base material and the thermal spray coating on the surface layer, and the recesses act as notches, deteriorating peeling resistance, and the edges of the recesses cause abnormally accelerated wear on the cylinder wall surface. Sometimes I let it happen.
本発明は以上の事情に鑑みてなされたもので、耐摩耗性
、耐焼付性にすくれるとともに、耐剥離強度の高い下地
溶射皮膜を備えた溶射ピストンリングを提供することを
目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermal sprayed piston ring equipped with a base thermal sprayed coating that has excellent wear resistance and seizure resistance, and has high peeling resistance.
本発明の構成は、外周面に形成した下地溶射皮膜上に表
層部の溶射皮膜を備えるピストンリングにおいて、前記
下地溶射皮膜が、Ｎｂを６０重量％以上含み粒度が５μ
ｍ以上、４４μｍ未満のフェロニオブ合金粉を溶射した
ものか、あるいは前記フェロニオブ合金粉と、５〜５０
重量％で粒度が４４μｍ以上、１２５．ｃａｍ未満のＭ
Ｏ粉、Ｎｉ自溶性合金粉のいずれか又は両方と、を混合
溶射したものからなり、その皮膜厚さが２０〜１００μ
ｍであることを特徴とする。The present invention provides a piston ring having a surface sprayed coating on a base sprayed coating formed on the outer circumferential surface, wherein the base sprayed coating contains 60% by weight or more of Nb and has a particle size of 5 μm.
A thermally sprayed ferroniobium alloy powder with a diameter of 5 to 50 μm or more and less than 44 μm, or
Particle size is 44 μm or more in weight%, 125. M less than cam
It is made by spraying a mixture of O powder, Ni self-fluxing alloy powder, or both, and the film thickness is 20 to 100μ.
It is characterized by being m.
従来使用されているＮｉ−Ａｌ下地溶射皮膜の硬さはＩ
（ｖ２００以下であり、耐摩耗材として使用される表層
部の溶射皮膜及び母材より硬度が低いため、運転中のツ
イスト応力がＮ１−ｆｉ、１下地溶射皮膜に集中し、下
地溶射皮膜内で剥離を生しることがある。本発明は下地
溶射皮膜に耐摩耗性を付与するとともに、硬度を高くし
て下地溶射皮膜への応力集中を防止する。この特性を付
与する材料は粉末粒度を微細にしないと、母材との結合
力が不安定になるため、５μｍ以上、４４μｍ未満の微
細粉を使用する。The hardness of the conventionally used Ni-Al base thermal spray coating is I
(V200 or less, which is lower in hardness than the surface sprayed coating used as a wear-resistant material and the base material, so the twist stress during operation concentrates on the N1-fi, 1 base sprayed coating, causing peeling within the base sprayed coating. The present invention imparts abrasion resistance to the base thermal sprayed coating and increases its hardness to prevent stress concentration on the base thermal sprayed coating.The material that imparts this property has a fine powder particle size. If not, the bonding force with the base material will become unstable, so use fine powder of 5 μm or more and less than 44 μm.
溶射材の母材との結合力は溶射元素により大きな差があ
り、結合力の高い元素は周期率表の■、■族で、特に自
己結合力のある元素はＮｂ、Ｔａ。The bonding strength of thermal spraying materials with the base material varies greatly depending on the sprayed element. Elements with high bonding strength are groups ■ and ■ of the periodic table, and elements with particularly strong self-bonding strength are Nb and Ta.
ＭＯであり、その結合力は、 Ｎｂ：５５０ｋｇ／ｃｆｆＩ２ Ｔａ ： ４７０ｋｇ／ＣＩＩ＋２ Ｍ ｏ： ５７０ ｋｇ／ ｃｓ２ である。MO, and its binding force is Nb: 550kg/cffI2 Ta: 470kg/CII+2 Mo: 570 kg/cs2 It is.
なお、これらの華元素では耐摩耗性に乏しい上に高価で
ある。In addition, these ferrous elements have poor wear resistance and are expensive.
これに対して、Ｆｅ−ＮｂあるいはＦｅ−ＮｂＴａのフ
ェロニオブ合金粉は、母材との密着性が良好である上に
、耐摩耗性があり、その上安価である。なお、合金粉の
硬さはＨｖ１０００程度である。On the other hand, Fe-Nb or Fe-NbTa ferroniobium alloy powder has good adhesion to the base material, has wear resistance, and is inexpensive. Note that the hardness of the alloy powder is about Hv1000.
フェロニオブ合金粉中のＮｂ、Ｔａ、Ｆｅ以外の不純物
は少ない方がよく、Ｎｂの含有量は６０重量％以上がよ
い。なお、より好ましくは６５重量％以上である。そし
て、母材との密着性等の点で粉末の粒度は５μｍ以上、
４４μｍ未満がよい。It is better to have fewer impurities other than Nb, Ta, and Fe in the ferroniobium alloy powder, and the content of Nb is preferably 60% by weight or more. Note that the content is more preferably 65% by weight or more. In terms of adhesion to the base material, the particle size of the powder should be 5 μm or more.
It is preferably less than 44 μm.
粉末の粒度が５μｍ未満では過溶融となり、溶射効率が
著しく低下し、４４μｍ以上では溶融不足により母材と
の密着性が劣化するおそれがある。If the particle size of the powder is less than 5 μm, over-melting will occur, resulting in a significant drop in thermal spraying efficiency, and if the particle size is 44 μm or more, there is a risk of poor adhesion to the base material due to insufficient melting.
なお、より好ましい範囲は１０〜２０μｍである。In addition, the more preferable range is 10-20 micrometers.
また、上記フェロニオブ合金粉に、粒度が４４μｍ以上
、１２５μｍ未満の摺動特性及び母材との密着性を妨げ
ないＭＯ粉、Ｎｉ自溶性合金粉を混合溶射すれば、下地
溶射皮膜の粗さが太き（なって、表層部の溶射皮膜との
結合力が高まる。下地溶射皮膜と表層部の溶射皮膜の結
合はインタロック結合であり（第２図参照、■はピスト
ンリング母材、３は下地溶射皮膜、４は表層部の溶射皮
膜）、そのため結合力を上げるには下地溶射皮膜の表面
粗さを粗（する必要があり、それには下地溶射材の粒度
を大きくするのがよい。４４μｍ未満では粗さ出しの効
果が望めず、１２５μｍ以上では溶融不足になる可能性
があり、気孔が粗大になり、結合力が劣化する。なお、
より好ましい範囲は６３μｍ以上、１００μｍ未満であ
る。また、ＭＯ粉、Ｎｉ自溶性合金粉の混合量は５重量
％未満では粗さ出しの効果が望めず、５０重量％を超え
ると、硬さが低下し、層内強度が低下し、剥離を生しる
おそれがある。なお、より好ましい範囲は１５〜４０重
量％である。In addition, if the above ferroniobium alloy powder is mixed with MO powder and Ni self-fusing alloy powder with a particle size of 44 μm or more and less than 125 μm that does not impede the sliding properties and adhesion to the base material, the roughness of the base thermal sprayed coating can be reduced. The bonding strength with the thermal sprayed coating on the surface layer increases.The bond between the base thermal sprayed coating and the thermal sprayed coating on the surface layer is an interlock bond (see Figure 2, ■ indicates the piston ring base material, and 3 indicates the piston ring base material. The base sprayed coating, 4 is the surface sprayed coating), therefore, to increase the bonding strength, the surface roughness of the base sprayed coating must be roughened (44 μm). If it is less than 125 μm, the effect of roughening cannot be expected, and if it is more than 125 μm, melting may be insufficient, the pores will become coarse, and the bonding strength will deteriorate.
A more preferable range is 63 μm or more and less than 100 μm. Furthermore, if the mixing amount of MO powder and Ni self-fusing alloy powder is less than 5% by weight, no roughness effect can be expected, and if it exceeds 50% by weight, the hardness will decrease, the intralayer strength will decrease, and peeling will occur. There is a risk that this may occur. Note that a more preferable range is 15 to 40% by weight.
次に拡げテストを行った結果を説明する。球状黒鉛鋳鉄
よりなるリング径９０ｍｍφのピストンリングの外周面
の母材表面を、粗さ２０μｍＲＺにブラスト加工した後
、下地溶射材を単層でプラズマ溶射し、常法で仕上加工
した。そして、ビストンリングの内周の対称位置に配置
する一対のピンを反対方向に動かしてピストンリングを
拡げ、剥離又はクラック発生までの拡げ量を調べた。Next, the results of the expansion test will be explained. The base material surface of the outer circumferential surface of a piston ring made of spheroidal graphite cast iron and having a ring diameter of 90 mmφ was blasted to a roughness of 20 μm RZ, and then a single layer of base thermal spray material was plasma sprayed and finished using a conventional method. Then, a pair of pins arranged at symmetrical positions on the inner circumference of the piston ring were moved in opposite directions to expand the piston ring, and the amount of expansion until separation or cracking occurred was examined.
（１）下地溶射材
Ｆ ｅ−Ｎｂ−Ｔａ ：ＪＩＳ Ｇ２３１９相当材Ｆ
ｅ −Ｎ ｂ ： ＪＩＳ Ｇ２３１９相当材Ｍ
Ｏ：純度９９．７０％
Ｎｉ自溶性合金： ＪＩＳ ＭＳＦＮｉ−２相当材Ｆｅ
−Ｎｂ−Ｔａ、Ｆｅ−Ｎｂの粉末粒度は５μｍ以上、４
４μｍ未満。(1) Base thermal spray material F e-Nb-Ta: JIS G2319 equivalent material F
e -N b: JIS G2319 equivalent material M
O: Purity 99.70% Ni self-fusing alloy: JIS MSFNi-2 equivalent material Fe
-Nb-Ta, Fe-Nb powder particle size is 5 μm or more, 4
Less than 4 μm.
Ｍｏ、Ｎｉ自溶性合金の粉末粒度は４４μｍ以上、１２
５μｍ未満。The powder particle size of Mo, Ni self-fusing alloy is 44 μm or more, 12
Less than 5 μm.
（２）表層部の溶射材 高Ｃｒ鋳鉄 ：５０重量％ ＭＯ：３０重量％ Ｎｉ自溶性合金：２０重量％ （ＪＩＳ門５ＦＮｉ−２相当材） 結果を表１と表２に示す。(2) Thermal spray material on the surface layer High Cr cast iron: 50% by weight MO: 30% by weight Ni self-fusing alloy: 20% by weight (JIS gate 5FNi-2 equivalent material) The results are shown in Tables 1 and 2.
表１
（以下余白）
表２
上記のように、下地溶射皮膜が厚さ４０μｍのＮｉ−５
％ＡＩでは、下地溶射皮膜内で剥離する。Table 1 (blank below) Table 2 As shown above, the base thermal spray coating is Ni-5 with a thickness of 40 μm.
%AI, peeling occurs within the base thermal spray coating.
そして、Ｎｉ−５％ＡＩの下地溶射皮膜厚さを８０μｍ
にすれば剥離せず、クラックの発生にとどまるが、拡げ
量は３３ｍｍと小さい、これに対して、本発明のものは
、厚さ２０〜４０μｍで、いずれも単なるクランク発生
のみで剥離せず、拡げ量もＮｉ−５％Ａｊ’のものに比
べて大きいことがわかる。Then, the thickness of the Ni-5% AI base thermal spray coating was 80 μm.
If the thickness is 20 to 40 μm, no peeling occurs and only cracks occur, but the amount of expansion is as small as 33 mm.On the other hand, in the case of the present invention, the thickness is 20 to 40 μm, and only cracks occur and no peeling occurs. It can be seen that the amount of expansion is also larger than that of Ni-5%Aj'.
なお、下地溶射皮膜の厚さが２０μｍ未満であると、下
地溶射皮膜の粗さが不充分となり、１００μｍを越える
と、溶射皮膜全体に占める下地溶射皮膜の割合が多くな
って耐久性が劣るようになる。なお、より好ましい範囲
は３０〜８０μｍである。If the thickness of the base thermal sprayed coating is less than 20 μm, the roughness of the base sprayed coating will be insufficient, and if it exceeds 100 μm, the ratio of the base thermal sprayed coating to the entire thermal sprayed coating will increase, resulting in poor durability. become. In addition, the more preferable range is 30-80 micrometers.
第１図はピストンリングの外周面に溶射皮膜を形成した
ものを示す、即ち、ピストンリング母材１が球状黒鉛鋳
鉄よりなるピストンリングの外周面に浅い凹溝２を全周
にわたって形成し、母材面を粗さ２０μｍＲＺにブラス
ト加工した後、その溝２内に下記に示す下地溶射材をプ
ラズマ溶射して、溝２内の全表面に下地溶射皮膜３を厚
さ６０μｍ設け、その後下記に示す表層部の溶射材を溝
２内にプラズマ溶射して、下地溶射皮膜３上に表層部の
溶射皮膜４を厚さ１５０μｍ設け、所定の仕上加工を施
して形成したものである。Fig. 1 shows a piston ring with a thermally sprayed coating formed on its outer circumferential surface. In other words, a piston ring base material 1 is made of spheroidal graphite cast iron, and shallow grooves 2 are formed over the entire circumference of the piston ring. After blasting the material surface to a roughness of 20 μm RZ, a base thermal spraying material shown below was plasma sprayed into the groove 2 to provide a base thermal spray coating 3 with a thickness of 60 μm on the entire surface within the groove 2, and then the following The surface sprayed material is plasma sprayed into the grooves 2, and a surface sprayed coating 4 with a thickness of 150 μm is provided on the base sprayed coating 3, followed by a predetermined finishing process.
下地溶射材：
Ｎｂを６０重量％以上含むフェロニオブ合金粉のみ、あ
るいはこれに５〜５０重量％でＭＯ粉、Ｎｉ自溶性合金
粉のいずれか又は両方を混合したもので、フェロニオブ
合金粉の粒度は５μｍ以上、４４μｍ未満、ＭＯ粉、Ｎ
ｉ自溶性合金の粒度は４４μｍ以上、１２５μｍ未満の
もの。Base thermal spray material: Only ferroniobium alloy powder containing 60% by weight or more of Nb, or mixed with 5 to 50% by weight of MO powder, Ni self-fluxing alloy powder, or both. The particle size of ferroniobium alloy powder is 5μm or more, less than 44μm, MO powder, N
i The grain size of the self-fusing alloy is 44 μm or more and less than 125 μm.
表層部の溶射材：
高Ｃｒ鋳鉄 ５０重量％
ＭＯ３０重量％
Ｎｉ自溶性合金 ２０重量％
（ＪＩＳ ＭＳＦＮｉ−２相当材）
ピストンリング母材は上記では球状黒鉛鋳鉄を使用した
が、勿論これに限ることはな（、他の鋳鉄あるいは鋼を
適宜使用すればよい。Sprayed materials for the surface layer: High Cr cast iron 50% by weight MO30% by weight Ni self-fusing alloy 20% by weight (JIS MSFNi-2 equivalent material) Spheroidal graphite cast iron was used as the piston ring base material above, but of course it is limited to this. Other cast iron or steel may be used as appropriate.
また、表層部の溶射材としては、上記に限らず、この他
例えば下記に示すもの等を使用するのがよい。Further, the thermal spraying material for the surface layer portion is not limited to those mentioned above, but it is also preferable to use, for example, those shown below.
高Ｃフェロクロム合金 ７０重量％
Ｍｏ ９重量％Ｎｉ自溶性合金
２１重量％
（ＪＩＳ ＭＳＦＮｉ−２相当材）
〔発明の効果〕
以上説明したように本発明によれば、耐摩耗性、耐焼付
性にすぐれるとともに、耐剥離強度の高い下地溶射皮膜
を備えた溶射ピストンリングとなる。High C ferrochrome alloy 70% by weight Mo 9% by weight Ni self-fluxing alloy 21% by weight (JIS MSFNi-2 equivalent material) [Effects of the Invention] As explained above, according to the present invention, wear resistance and seizure resistance are improved. This results in a thermally sprayed piston ring with a base thermally sprayed coating that has excellent peel resistance and high peel resistance.
第１図は本発明の一実施例を示すピストンリングの一部
分の縦断面図、第２図はその要部拡大圓である。
１はピストンリング母材、２は凹溝、３は下地溶射皮膜
、４は表層部の溶射皮膜。FIG. 1 is a vertical sectional view of a portion of a piston ring showing an embodiment of the present invention, and FIG. 2 is an enlarged view of the main part thereof. 1 is the piston ring base material, 2 is the groove, 3 is the base sprayed coating, and 4 is the surface sprayed coating.
Claims (2)
皮膜を備えるピストンリングにおいて、前記下地溶射皮
膜が、Ｎｂを６０重量％以上含み粒度が５μｍ以上、４
４μｍ未満のフェロニオブ合金粉を溶射したもので、そ
の皮膜厚さが２０〜１００μｍであることを特徴とする
ピストンリング。(1) In a piston ring having a surface sprayed coating on a base sprayed coating formed on the outer peripheral surface, the base sprayed coating contains 60% by weight or more of Nb and has a particle size of 5 μm or more;
A piston ring characterized in that it is thermally sprayed with ferroniobium alloy powder of less than 4 μm and has a coating thickness of 20 to 100 μm.
皮膜を備えるピストンリングにおいて、前記下地溶射皮
膜が、Ｎｂを６０重量％以上含み粒度が５μｍ以上、４
４μｍ未満のフェロニオブ合金粉と、５〜５０重量％で
粒度が４４μｍ以上、１２５μｍ未満のＭｏ粉、Ｎｉ自
溶性合金粉のいずれか又は両方と、を混合溶射したもの
で、その皮膜厚さが２０〜１００μｍであることを特徴
とするピストンリング。(2) In a piston ring having a surface sprayed coating on the base sprayed coating formed on the outer peripheral surface, the base sprayed coating contains 60% by weight or more of Nb and has a particle size of 5 μm or more;
A mixture of ferroniobium alloy powder less than 4 μm and either or both of Mo powder and Ni self-fusing alloy powder with a particle size of 44 μm or more and less than 125 μm at 5 to 50% by weight, and the coating thickness is 20 μm. A piston ring characterized in that it has a diameter of ~100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9988490A JPH0465A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9988490A JPH0465A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0465A true JPH0465A (en) | 1992-01-06 |
Family
ID=14259215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9988490A Pending JPH0465A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0465A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491679A (en) * | 1992-08-19 | 1996-02-13 | Olympus Optical Co., Ltd. | Information recording and/or reproducing apparatus with shutter member and shuttle linked for movement together |
-
1990
- 1990-04-16 JP JP9988490A patent/JPH0465A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5491679A (en) * | 1992-08-19 | 1996-02-13 | Olympus Optical Co., Ltd. | Information recording and/or reproducing apparatus with shutter member and shuttle linked for movement together |
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