JP3192668B2 - Wet friction material - Google Patents
Wet friction materialInfo
- Publication number
- JP3192668B2 JP3192668B2 JP4126991A JP4126991A JP3192668B2 JP 3192668 B2 JP3192668 B2 JP 3192668B2 JP 4126991 A JP4126991 A JP 4126991A JP 4126991 A JP4126991 A JP 4126991A JP 3192668 B2 JP3192668 B2 JP 3192668B2
- Authority
- JP
- Japan
- Prior art keywords
- friction material
- aramid fiber
- resin
- thermosetting resin
- wet friction
- 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.)
- Expired - Fee Related
Links
Landscapes
- Braking Arrangements (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、冷却効果も加味した潤
滑油の存在の下に用いられる、所謂、湿式のブレーキ又
はクラッチフェージングもしくはライニング用に適する
湿式摩擦材料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet friction material suitable for so-called wet brake or clutch phasing or lining, which is used in the presence of a lubricating oil having a cooling effect.
【０００２】[0002]
【従来の技術】一般に、湿式摩擦材料は、有機系摩擦材
料と無機系摩擦材料に大別できる。この内、有機系摩擦
材料の代表的なものとしては、樹脂と繊維をマトリック
スとする摩擦材料がある。2. Description of the Related Art In general, wet friction materials can be roughly classified into organic friction materials and inorganic friction materials. Among these, a typical example of the organic friction material is a friction material having a matrix of resin and fiber.
【０００３】摩擦材料に含有されている繊維としては、
フェノール繊維，ガラス繊維，炭素繊維，アラミド繊維
などがある。これらの内、アラミド繊維は、高強度及び
高弾性率を有していることから摩擦材料に使用されてい
る。The fibers contained in the friction material include:
Phenol fiber, glass fiber, carbon fiber, aramid fiber, etc. Of these, aramid fibers are used for friction materials because of their high strength and high elastic modulus.
【０００４】アラミド繊維と樹脂とを含有してなる摩擦
材料としての代表的なものに、特開昭５９−２２１３７
４号公報，特開昭６０−２０６８３８号公報及び特開昭
６３−６７４３６号公報がある。A typical friction material containing an aramid fiber and a resin is disclosed in JP-A-59-22137.
No. 4, JP-A-60-206838 and JP-A-63-67436.
【０００５】[0005]
【発明が解決しようとする課題】特開昭５９−２２１３
７４号公報，特開昭６０−２０６８３８号公報及び特開
昭６３−６７４３６号公報に代表されるアラミド繊維と
樹脂とを含有してなる従来の摩擦材料は、製造方法によ
り異なるが、抄造法で作製する場合には、用紙状の成形
体にする工程、この成形体を切断もしくは切断後に渦巻
状態に積層する工程などで、絡み合った網目状のアラミ
ド繊維の切断面により成形体の面粗度が低下すること、
並びに製造工程が複雑であるという問題がある。SUMMARY OF THE INVENTION Japanese Patent Laid-Open No. 59-2213
No. 74, JP-A-60-206838 and JP-A-63-67436, conventional friction materials containing an aramid fiber and a resin differ depending on the production method. In the case of manufacturing, the surface roughness of the molded body is reduced by the cut surface of the entangled mesh-like aramid fiber in the step of forming a paper-shaped molded body, the step of cutting this molded body or laminating in a spiral state after cutting. Lowering,
In addition, there is a problem that the manufacturing process is complicated.
【０００６】また、摩擦材料を金型などで型成形する場
合には、絡み合った網目状のアラミド繊維がフイブリル
状になりやすく、このために、特に乾式混合時に毛玉状
になり、次工程の金型への振り込みを困難にしている。
このために、摩擦材料に含有させるアラミド繊維の量を
制限する必要があること、仮に、多量のアラミド繊維を
含有させたとしてもアラミド繊維自体の特徴である高強
度性を引き出せないという問題がある。Further, when the friction material is molded with a mold or the like, the entangled mesh-like aramid fibers tend to be in the form of fibrils. Making it difficult to transfer money to.
For this reason, it is necessary to limit the amount of the aramid fiber contained in the friction material, and even if a large amount of aramid fiber is contained, there is a problem that the high strength characteristic of the aramid fiber itself cannot be brought out. .
【０００７】さらに、摩擦材料は、高摺速時の摩擦係数
を向上させるためには気孔率を高めることが好ましいこ
とであるけれども、上述の従来の摩擦材料ではアラミド
繊維の有効な強度を引き出せてないために高気孔率にす
ることが困難であるという問題がある。Further, it is preferable that the porosity of the friction material is increased in order to improve the friction coefficient at a high sliding speed. However, the above-mentioned conventional friction material can bring out the effective strength of the aramid fiber. Therefore, there is a problem that it is difficult to increase the porosity.
【０００８】 本発明は、上述のような問題点を解決し
たもので、具体的には、樹脂を被覆させたアラミド繊維
を含有させることにより、高強度及び高気孔率を達成さ
せ、高摺速及び高負荷の使用条件においても高い摩擦係
数を有する湿式摩擦材料の提供を目的とするものであ
る。The present invention has solved the above-mentioned problems. Specifically, the present invention achieves high strength and high porosity by containing aramid fiber coated with a resin, and achieves high sliding speed. It is another object of the present invention to provide a wet friction material having a high friction coefficient even under high load use conditions.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、樹脂と繊
維とを含有してなる摩擦材料の強度を高めること及び気
孔率を高めることについて検討していた所、第１に、摩
擦材料に含有させる繊維は、アラミド繊維が好ましいけ
れども、アラミド繊維の切断面が鉤状になり、混合時
に、この鉤状部分の絡みにより毛玉状の塊りが形成され
ること、この毛玉状の塊りが摩擦材料の強度を低下させ
ているという知見を得たものである。Means for Solving the Problems The present inventors have been studying to increase the strength and porosity of a friction material containing a resin and a fiber. Aramid fibers are preferable, but the cut surface of the aramid fibers becomes hook-like, and at the time of mixing, the entanglement of the hook-like portions forms a ball-shaped lump. It has been found that the strength of the material is reduced.
【００１０】第２に、アラミド繊維に樹脂の被膜を被覆
させると切断面における鉤状の形成が生じなく、従って
毛玉状の塊りも生じなく、これを用いて摩擦材料を作製
すると顕著に強度が向上すること、並びに高強度になる
ことから気孔率を高めても実用可能な強度が得られると
いう知見を得たものである。Secondly, when the aramid fiber is coated with a resin film, hook-shaped formation on the cut surface does not occur, and therefore no pill-shaped lumps are formed. Using this to produce a friction material significantly increases the strength. It has been found that a practically usable strength can be obtained even if the porosity is increased due to the improvement and the high strength.
【００１１】本発明は、上述の第１及び第２の知見に基
づいて本発明を完成するに至ったものである。The present invention has been completed based on the above-mentioned first and second findings.
【００１２】 すなわち、本発明の湿式摩擦材料は、５
〜４０重量％の熱硬化性樹脂でなる結合相と、残部のア
ラミド繊維を含むフイラーとが混合されてなる摩擦材料
であって、該アラミド繊維が平均直径９〜１５μｍ、平
均長さ０．２〜１．０ｍｍからなり、該アラミド繊維が
熱硬化性樹脂の被膜で被覆されており、該摩擦材料に気
孔が形成されていることを特徴とするものである。That is, the wet friction material of the present invention
A friction material obtained by mixing a binder phase made of a thermosetting resin of about 40% by weight with a filler containing the remaining aramid fiber, wherein the aramid fiber has an average diameter of 9 to 15 μm and an average length of 0.2. 1.0 mm, wherein the aramid fiber is covered with a thermosetting resin film, and pores are formed in the friction material.
【００１３】本発明における熱硬化性樹脂は、具体的に
は、例えばフェノール樹脂，ポリイミド樹脂，エポキシ
樹脂，フラン樹脂，キシレン樹脂，ケトン樹脂，尿素樹
脂，メラミン樹脂，アニリン樹脂，スルホンアミド樹
脂，アルキド樹脂を代表例として挙げることができる。The thermosetting resin in the present invention is, for example, phenol resin, polyimide resin, epoxy resin, furan resin, xylene resin, ketone resin, urea resin, melamine resin, aniline resin, sulfonamide resin, alkyd resin. Resin can be mentioned as a typical example.
【００１４】 これらの内、結合相としての熱硬化性樹
脂は、ポリイミド樹脂やフェノール樹脂が好ましく、ア
ラミド繊維を被覆する被膜としての熱硬化性樹脂は、例
えば、アラミド繊維全体の数重量％が被膜で被覆されて
いる場合、具体的にはアラミド繊維全体に対して約１重
量％の被膜から効果が発揮され、この被膜はエポキシ樹
脂が好ましく、特に結合相がエポキシ樹脂からなり、か
つアラミド繊維を被覆する被膜もエポキシ樹脂からなる
場合には強度の向上が顕著であることから、好ましいこ
とである。Among these, the thermosetting resin as the binder phase is preferably a polyimide resin or a phenol resin, and the thermosetting resin as the coating covering the aramid fiber is, for example, a coating of several weight% of the entire aramid fiber. In the case of being coated with an aramid fiber, the effect is specifically exhibited from a coating of about 1% by weight based on the entire aramid fiber. This coating is preferably made of an epoxy resin, and in particular, the binding phase is made of an epoxy resin, and the aramid fiber is used. It is preferable that the coating film to be coated is made of an epoxy resin, because the strength is remarkably improved.
【００１５】本発明におけるアラミド繊維の形状は、摩
擦材料として用いる用途及び形状により異なるけれど
も、製造工程、特にプレス成形時の金型への振込みの容
易性と摩擦材料の強度から直径９〜１５μｍ，長さ０．
２〜１．０ｍｍからなることが好ましく、このアラミド
繊維の含有量は、２５重量％以下、好ましくは１〜１０
重量％である。Although the shape of the aramid fiber in the present invention varies depending on the use and shape used as the friction material, the diameter of the aramid fiber is preferably 9 to 15 μm due to the ease of transfer to the mold during the press molding and the strength of the friction material. Length 0.
The aramid fiber content is preferably 25% by weight or less, and more preferably 1 to 10%.
% By weight.
【００１６】本発明におけるフイラーは、具体的には、
例えば、アルミナ，シリカ，ムライト，炭化ケイ素，フ
ッ化カルシウム，二硫化モリブデン，二硫化タングステ
ン，硫酸バリウムなどのセラミックス，天然ゴム，ＮＢ
Ｒ（アクリロニトリル・ブタジエンゴム），ＳＢＲ（ス
チレン・ブタジエンゴム），アクリルゴム，ウレタンゴ
ム，シリコンゴム，フッ素ゴムなどのゴム，カーボン，
ガラス，金属，セラミックス，樹脂からなる無機繊維，
金属繊維又は有機繊維，黒鉛，膨張化黒鉛，無定形炭
素，コークスなどの炭素物質，銅，錫，鉄，鉛，黄銅又
はこれらの合金などの金属及びカシューダスト，鉱物質
物などを挙げることができる。The filler according to the present invention is, specifically,
For example, ceramics such as alumina, silica, mullite, silicon carbide, calcium fluoride, molybdenum disulfide, tungsten disulfide, barium sulfate, natural rubber, NB
R (acrylonitrile-butadiene rubber), SBR (styrene-butadiene rubber), acrylic rubber, urethane rubber, silicone rubber, fluororubber and other rubbers, carbon,
Inorganic fiber made of glass, metal, ceramics, resin,
Metallic or organic fibers, graphite, expanded graphite, amorphous carbon, carbonaceous materials such as coke, metals such as copper, tin, iron, lead, brass, and alloys thereof, cashew dust, and minerals. .
【００１７】本発明の湿式摩擦材料中に存在させる気孔
は、多くなりすぎると強度低下となり、少なすぎると含
油性及び弾力性に乏しくなることから全体の１０〜５０
体積％が好ましく、特に３０〜５０体積％が好ましいこ
とである。また、この気孔は、できるだけ均一に分散さ
せておくのが好ましいことである。If the number of pores present in the wet friction material of the present invention is too large, the strength is reduced, and if the number is too small, the oil content and elasticity are poor.
% By volume, particularly preferably 30 to 50% by volume. In addition, it is preferable that the pores be dispersed as uniformly as possible.
【００１８】本発明の湿式摩擦材料は、結合相が５重量
％未満になると相対的にフイラーが９５重量％を超えて
多くなって、強度低下が顕著になること、逆に結合相が
４０重量％を超えて多くなると相対的にフイラーが６０
重量％未満となって、弾力性に乏しくなること及び摩擦
が生じた時に結合相の塑性流動が大きくなって、摩擦係
数の低下を起こさせる。このために、本発明の湿式摩擦
材料における結合相は、５〜４０重量％と定めたもので
ある。In the wet friction material of the present invention, when the binder phase is less than 5% by weight, the filler is relatively increased to more than 95% by weight, and the strength is remarkably reduced. %, The relative number of fillers is 60
When the content is less than 10% by weight, the elasticity becomes poor, and when the friction occurs, the plastic flow of the binder phase increases and the friction coefficient decreases. For this reason, the binder phase in the wet friction material of the present invention is determined to be 5 to 40% by weight.
【００１９】本発明の湿式摩擦材料は、従来から行われ
ている摩擦材料の製造方法でもって作製することができ
る。特に、本発明における気孔の形成については、含油
軸受けやフィルターなどの多孔質製品の製造方法を応用
することにより、作製することができるもので、具体的
には、熱硬化性樹脂とフィラーからなる出発物質の中に
加熱焼成時に揮散してしまう造孔物質を添加しておくこ
とである。また、気孔率は、従来と同様に、造孔物質の
量，種類及び揮散処理などの調整によりコントロールす
ることができる。The wet friction material of the present invention can be produced by a conventional friction material production method. In particular, the formation of the pores in the present invention can be produced by applying a method for producing a porous product such as an oil-impregnated bearing or a filter, and specifically includes a thermosetting resin and a filler. It is to add a pore-forming substance which is volatilized at the time of heating and firing in the starting material. In addition, the porosity can be controlled by adjusting the amount, type and volatilization treatment of the pore-forming substance as in the conventional case.
【００２０】 造孔物質としては、例えば、ステアリン
酸，スルファニル酸，スルファミン酸，スルファミン酸
アンモニウム，ナフトール，ニトロフェノール，パラフ
ィン，パラホルムアルデヒド，パルミチン酸，フェノー
ル，無水マレイン酸を挙げることができる。これらの造
孔物質を使用した本発明の湿式摩擦材料の製造方法は、
結合相となる熱硬化性樹脂と、熱硬化性樹脂の被膜で被
覆されたアラミド繊維と、フイラーとからなる出発物質
の中に造孔物質を添加した配合試料を混合および成形
後、加熱焼成し、該加熱焼成時に該造孔物質を揮散させ
て摩擦材料中の気孔率を調整することを特徴とする方法
である。Examples of the pore-forming substance include stearic acid, sulfanilic acid, sulfamic acid, ammonium sulfamate, naphthol, nitrophenol, paraffin, paraformaldehyde, palmitic acid, phenol, and maleic anhydride. The method for producing a wet friction material of the present invention using these pore-forming substances,
After mixing and molding a blended sample obtained by adding a pore-forming substance to a starting material consisting of a thermosetting resin serving as a binder phase, an aramid fiber covered with a coating of a thermosetting resin, and a filler, and heating and firing. And volatilizing the pore-forming substance during the heating and firing to adjust the porosity of the friction material.
【００２１】[0021]
【作用】本発明の湿式摩擦材料は、アラミド繊維を被覆
している熱硬化性樹脂の被膜がアラミド繊維と熱硬化性
樹脂の結合相とを強固に結合させる仲介的作用をすると
共に他のフィラーとの結合をも可能とするものである。
特に、エポキシ樹脂の被膜の場合は、アラミド繊維と被
膜との親和性が高いことからアラミド繊維と被膜との結
合をも強固にする作用をしており、この被膜で被覆され
たアラミド繊維による摩擦材料の高強度化が摩擦材料自
体の気孔を高くしても実用可能な強度を保持させている
ものである。According to the wet friction material of the present invention, the thermosetting resin coating covering the aramid fiber acts as an intermediary for firmly bonding the aramid fiber and the binder phase of the thermosetting resin, and the other friction filler material. It is also possible to combine with.
In particular, in the case of an epoxy resin coating, the affinity between the aramid fiber and the coating is high, so that the bond between the aramid fiber and the coating is also strengthened. Even if the strength of the material is increased, the porosity of the friction material itself is increased so that the friction material can maintain a practically usable strength.
【００２２】[0022]
【実施例１】エポキシ樹脂の被膜を被覆したアラミド繊
維、アラミド繊維，チタン酸カリウム繊維，ガラス繊
維，カーボン繊維のそれぞれの平均直径５〜２５μｍ，
平均長さ０．１〜１．０ｍｍと、他にＮＢＲ，硫酸バリ
ウム，膨張化黒鉛，カシューダスト，シリカ，ポリイミ
ド樹脂とを用いて表１（重量％）の如くに配合した。こ
の表１のそれぞれの配合試料をＶ型ミキサーにより混合
した後、外径３３５ｍｍ，内径２８３ｍｍ，深さ５ｍｍ
の金型に充填してプレス成形した。得られた成形体を常
温から２５０℃まで昇温し、２５０℃で１時間保持し、
焼成を行った。Embodiment 1 The average diameter of each of an aramid fiber, an aramid fiber, a potassium titanate fiber, a glass fiber and a carbon fiber coated with an epoxy resin film is 5 to 25 μm.
As shown in Table 1 (% by weight), an average length of 0.1 to 1.0 mm and NBR, barium sulfate, expanded graphite, cashew dust, silica, and a polyimide resin were used. After mixing each of the blended samples in Table 1 with a V-type mixer, the outer diameter was 335 mm, the inner diameter was 283 mm, and the depth was 5 mm.
And press-molded. The temperature of the obtained molded body was raised from room temperature to 250 ° C., and kept at 250 ° C. for 1 hour.
The firing was performed.
【００２３】こうして得た本発明品１〜５及び比較品
１，２の抗折強度，気孔率を測定し、さらに摺速４８ｍ
／ｓｅｃ，吸収エネルギー１０ｋｇｆｍ／ｃｍ2という
高摺速での１万サイクルの耐久試験時における動摩擦係
数，静摩擦係数及び摩耗率を測定し、それぞれの結果を
表２に示した。The bending strength and porosity of the thus obtained inventive products 1 to 5 and comparative products 1 and 2 were measured, and the sliding speed was 48 m.
The coefficient of dynamic friction, the coefficient of static friction, and the rate of wear were measured during a 10,000-cycle endurance test at a high sliding speed of 10 kgfm / cm 2 and an absorption energy of 10 kgfm / cm 2 , and the results are shown in Table 2.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】以上から、本発明の湿式摩擦材料は、被
膜が被覆されてなく、含有量も少ないアラミド繊維入り
の比較の摩擦材料に比べて、気孔率が高いにもかかわら
ず抗折強度が略同等で、動摩擦係数と静摩擦係数の差が
小さく、耐摩耗性が向上しているという効果がある。As described above, the wet friction material of the present invention has a high bending strength despite having a high porosity compared to a comparative friction material containing an aramid fiber having no coating and a small content. Are substantially equal, the difference between the dynamic friction coefficient and the static friction coefficient is small, and the wear resistance is improved.
【００２７】このことから、本発明の湿式摩擦材料は、
従来の摩擦材料の用途領域から高負荷又は高摺速の領域
にまで実用できる有用な材料である。From this, the wet friction material of the present invention is
It is a useful material that can be used practically from the application area of the conventional friction material to the area of high load or high sliding speed.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ // Ｃ０８Ｌ 33:24 (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 3/14 520 F16D 69/02 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification symbol FI // C08L 33:24 (58) Investigated field (Int. Cl. 7 , DB name) C09K 3/14 520 F16D 69/02
Claims (5)
合相と、残部のアラミド繊維を含むフイラーとが混合さ
れてなる摩擦材料において、該アラミド繊維が平均直径
９〜１５μｍ、平均長さ０．２〜１．０ｍｍからなり、
該アラミド繊維が熱硬化性樹脂の被膜で被覆されてお
り、該摩擦材料に気孔が形成されていることを特徴とす
る湿式摩擦材料。1. A friction material comprising a binder phase composed of 5 to 40% by weight of a thermosetting resin and a filler containing the remaining aramid fiber, wherein the aramid fiber has an average diameter of 9 to 15 μm and an average length. Consists of 0.2-1.0mm,
A wet friction material, wherein the aramid fiber is covered with a thermosetting resin film, and pores are formed in the friction material.
記摩擦材料全体の２５重量％以下含むことを特徴とする
請求項１に記載の湿式摩擦材料。2. The wet friction material according to claim 1, wherein the aramid fiber covered with the coating contains 25% by weight or less of the whole friction material.
上記被膜がエポキシ樹脂からなることを特徴とする請求
項１または２に記載の湿式摩擦材料。3. The binder phase comprises a polyimide resin,
3. The wet friction material according to claim 1, wherein the coating is made of an epoxy resin.
０体積％からなることを特徴とする請求項１，２または
３に記載の湿式摩擦材料。4. The method according to claim 1, wherein the pores are 30 to 5 parts of the entire friction material.
4. The wet friction material according to claim 1, comprising 0% by volume.
樹脂の被膜で被覆されたアラミド繊維と、フイラーとか
らなる出発物質の中に造孔物質を添加した配合試料を混
合および成形後、加熱焼成し、該加熱焼成時に該造孔物
質を揮散させて摩擦材料中の気孔率を調整することを特
徴とする湿式摩擦材料の製造方法。5. A mixed sample obtained by adding a pore-forming substance to a starting material consisting of a thermosetting resin serving as a binder phase, an aramid fiber covered with a coating of the thermosetting resin, and a filler. Thereafter, the method is heated and baked, and the porosity in the friction material is adjusted by volatilizing the pore-forming substance during the heated calcination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4126991A JP3192668B2 (en) | 1991-02-13 | 1991-02-13 | Wet friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4126991A JP3192668B2 (en) | 1991-02-13 | 1991-02-13 | Wet friction material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH059458A JPH059458A (en) | 1993-01-19 |
| JP3192668B2 true JP3192668B2 (en) | 2001-07-30 |
Family
ID=12603725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4126991A Expired - Fee Related JP3192668B2 (en) | 1991-02-13 | 1991-02-13 | Wet friction material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3192668B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3544723B2 (en) * | 1994-12-22 | 2004-07-21 | 富士重工業株式会社 | Exhaust control device for two-stroke engine |
| US5595266A (en) * | 1995-06-26 | 1997-01-21 | Wagner Electric Corporation | Bonding a friction material brake lining element to a metallic backing plate element |
| US8021744B2 (en) | 2004-06-18 | 2011-09-20 | Borgwarner Inc. | Fully fibrous structure friction material |
| US7429418B2 (en) | 2004-07-26 | 2008-09-30 | Borgwarner, Inc. | Porous friction material comprising nanoparticles of friction modifying material |
| WO2006116474A2 (en) | 2005-04-26 | 2006-11-02 | Borgwarner Inc. | Friction material |
| DE102008013907B4 (en) | 2008-03-12 | 2016-03-10 | Borgwarner Inc. | Frictionally-locking device with at least one friction plate |
| CN102261408A (en) * | 2010-05-24 | 2011-11-30 | 顾贵义 | Nanometer mullite automotive brake pad |
| CN106763367B (en) * | 2017-02-28 | 2018-11-16 | 佛山佳牧乐科技有限公司 | Brake block friction material, brake block and brake piece preparation method |
| JP7199853B2 (en) * | 2018-07-03 | 2023-01-06 | ポリプラスチックス株式会社 | Liquid crystalline resin composition for sliding wear resistant member and sliding wear resistant member using the same |
-
1991
- 1991-02-13 JP JP4126991A patent/JP3192668B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059458A (en) | 1993-01-19 |
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