JPH04353591A - Friction material and its production - Google Patents
Friction material and its productionInfo
- Publication number
- JPH04353591A JPH04353591A JP12962291A JP12962291A JPH04353591A JP H04353591 A JPH04353591 A JP H04353591A JP 12962291 A JP12962291 A JP 12962291A JP 12962291 A JP12962291 A JP 12962291A JP H04353591 A JPH04353591 A JP H04353591A
- Authority
- JP
- Japan
- Prior art keywords
- thermosetting resin
- antimony trioxide
- friction material
- steel fibers
- present
- 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
- 239000002783 friction material Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 239000003607 modifier Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000003856 thermoforming Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 241000206607 Porphyra umbilicalis Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229940007424 antimony trisulfide Drugs 0.000 description 1
- NVWBARWTDVQPJD-UHFFFAOYSA-N antimony(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Sb+3].[Sb+3] NVWBARWTDVQPJD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- -1 but in recent years Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052981 lead sulfide Inorganic materials 0.000 description 1
- 229940056932 lead sulfide Drugs 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、自動車のブレーキパッ
ド・ブレーキライニング等として使用される、高温で摩
耗が良好な摩擦材とその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material that wears well at high temperatures and is used as brake pads, brake linings, etc. of automobiles, and a method for manufacturing the same.
【０００２】0002
【従来の技術】従来、自動車用ブレーキパッド・ブレー
キライニング等として使用される摩擦材としては石綿繊
維を主要基材としたものが主体であったが、近年石綿公
害対策を基本に自動車の軽量化・高速化の方向を受けて
スチール繊維を主要基材とするセミメタリック系が主体
となってきた。しかし、スチール繊維は高温で酸化され
やすいため、摩擦材の高温における摩耗量が大きくなっ
てしまうという欠点がある。[Prior Art] Traditionally, friction materials used in automobile brake pads, brake linings, etc. were mainly based on asbestos fibers, but in recent years, asbestos pollution countermeasures have been used to reduce the weight of automobiles. - In response to the trend towards higher speeds, semi-metallic systems that use steel fiber as the main material have become mainstream. However, since steel fibers are easily oxidized at high temperatures, there is a drawback that the amount of wear of the friction material at high temperatures increases.
【０００３】0003
【発明が解決しようとする課題】本発明が解決しようと
する課題は、スチール繊維の高温における酸化を押さえ
、高温における摩耗量が小さい摩擦材を開発することで
ある。The problem to be solved by the present invention is to develop a friction material that suppresses oxidation of steel fibers at high temperatures and has a small amount of wear at high temperatures.
【０００４】0004
【課題を解決するための手段】本発明は、上記の課題を
解決することを目的としてなされたもので、本発明者ら
は、高温において摩耗が大きくなる原因となるスチール
繊維の酸化を押さえるため、スチール繊維の表面に酸素
吸収剤として三酸化アンチモンを施すことにより摩耗が
良好になることを知得し、本発明を完成するに至った。[Means for Solving the Problems] The present invention has been made to solve the above problems, and the present inventors have devised a method for suppressing oxidation of steel fibers, which causes increased wear at high temperatures. They discovered that abrasion can be improved by applying antimony trioxide as an oxygen absorbent to the surface of steel fibers, and have completed the present invention.
【０００５】すなわち、本発明は表面に三酸化アンチモ
ンと硬化した熱硬化性樹脂との混合物が施されたスチー
ル繊維、熱硬化性樹脂結合剤及び摩擦調整材よりなる組
成物を加熱成形してなることを特徴とする摩擦材を提供
するものである。本発明の摩擦材はスチール繊維を主要
基材とし、かつこのスチール繊維は予めその表面に三酸
化アンチモンと熱硬化性樹脂の混合物を施したものであ
る。That is, the present invention is made by thermoforming a composition comprising steel fibers coated with a mixture of antimony trioxide and a hardened thermosetting resin on the surface, a thermosetting resin binder, and a friction modifier. The present invention provides a friction material characterized by the following. The friction material of the present invention has steel fiber as its main base material, and the surface of the steel fiber has been previously coated with a mixture of antimony trioxide and a thermosetting resin.
【０００６】本発明の摩擦材は、例えばスチール繊維と
三酸化アンチモンと熱硬化性樹脂とを混合し、次いで熱
硬化性樹脂を硬化させてスチール繊維の表面に三酸化ア
ンチモンと硬化した熱硬化性樹脂との混合物を施し、こ
れを３ｍｍ〜５ｍｍの粒子に造粒した後、この粒子と熱
硬化性樹脂結合剤及び摩擦調整剤を混合し、得られた組
成物を加熱成形することにより製造することができる。The friction material of the present invention is produced by, for example, mixing steel fibers, antimony trioxide, and a thermosetting resin, and then curing the thermosetting resin to coat the surface of the steel fibers with antimony trioxide and the hardened thermosetting resin. After applying a mixture with a resin and granulating this into particles of 3 mm to 5 mm, the particles are mixed with a thermosetting resin binder and a friction modifier, and the resulting composition is produced by thermoforming. be able to.
【０００７】本発明において用いられるスチール繊維は
摩擦材に通常用いられているものが用いられるが、長さ
２ｍｍ、径９０μｍのものが好適に用いられる。表面に
施される三酸化アンチモンの量はスチール繊維１００体
積部に対して２０〜４０体積部とすることが好ましい。
この三酸化アンチモンは熱硬化性樹脂のワニスに分散さ
せて、らいかい機等の攪拌機で攪拌した後、溶剤を乾燥
させることによりスチール繊維の表面に施される。同時
に熱硬化性樹脂も硬化する。三酸化アンチモンとともに
用いられる熱硬化性樹脂としては通常摩擦材の結合材と
して用いられる樹脂と同一又は同種のものが用いられる
。通常、いずれもフェノール樹脂が好適に用いられる。[0007] The steel fibers used in the present invention are those commonly used for friction materials, and those having a length of 2 mm and a diameter of 90 μm are preferably used. The amount of antimony trioxide applied to the surface is preferably 20 to 40 parts by volume per 100 parts by volume of steel fiber. This antimony trioxide is applied to the surface of steel fibers by dispersing it in a thermosetting resin varnish, stirring it with a stirrer such as a laver, and then drying the solvent. At the same time, the thermosetting resin is also cured. The thermosetting resin used together with antimony trioxide is the same or of the same type as the resin normally used as a binder for friction materials. Generally, phenolic resins are preferably used in both cases.
【０００８】本発明においては、三酸化アンチモンと熱
硬化性樹脂が施されたスチール繊維を更に３〜５ｍｍの
粒子に造粒することが好ましい。造粒することにより、
高温における耐酸化性が向上する。造粒はスチール繊維
が絡み合い、かつスチール繊維の付近に三酸化アンチモ
ンが多く存在するように造粒する。In the present invention, it is preferable to further granulate the steel fiber coated with antimony trioxide and thermosetting resin into particles of 3 to 5 mm. By granulating,
Improves oxidation resistance at high temperatures. Granulation is performed so that the steel fibers are entangled and a large amount of antimony trioxide is present near the steel fibers.
【０００９】その他、本発明の摩擦材組成物中には、黒
鉛、硫酸バリウム、二硫化モリブデン、三硫化アンチモ
ン、亜鉛、酸化銅、シリカ、アルミナ、炭酸カルシウム
、クレー、ムライト、硫化鉛、バーミキュライト、酸化
カルシウム、炭酸マグネシウム等の通常用いられている
摩擦調整剤が配合されている。更に、通常本発明の目的
を妨げない範囲内で他の繊維、結合剤等の通常摩擦材組
成物に用いられる添加材を加えることができる。In addition, the friction material composition of the present invention contains graphite, barium sulfate, molybdenum disulfide, antimony trisulfide, zinc, copper oxide, silica, alumina, calcium carbonate, clay, mullite, lead sulfide, vermiculite, Contains commonly used friction modifiers such as calcium oxide and magnesium carbonate. Furthermore, other additives such as fibers and binders that are normally used in friction material compositions can be added within a range that does not interfere with the purpose of the present invention.
【００１０】0010
【作用】本発明の摩擦材は、スチール繊維の表面に三酸
化アンチモンを施している。図１にＴＧＡ（熱重量変化
）によって調べたスチール繊維の熱重量変化曲線を示す
。また、図２に三酸化アンチモンを１０体積％加えたス
チール繊維の熱重量変化曲線を示す。図１と図２を比較
すると分るように、明らかに三酸化アンチモンがスチー
ル繊維の酸化を押さえている。このように酸化を押さえ
ることによって、高温における摩耗が良好になる。[Operation] The friction material of the present invention has antimony trioxide applied to the surface of steel fibers. Figure 1 shows a thermogravimetric change curve of steel fibers examined by TGA (thermogravimetric analysis). Further, FIG. 2 shows a thermogravimetric change curve of steel fibers to which 10% by volume of antimony trioxide was added. As can be seen by comparing Figures 1 and 2, antimony trioxide clearly suppresses the oxidation of the steel fibers. By suppressing oxidation in this way, wear at high temperatures is improved.
【００１１】[0011]
【実施例】以下、本発明を実施例に基づいて詳細に説明
するが、本発明はこれに限定されるものではない。表１
に示すような摩擦材組成物を用いてセミメタリックディ
スクブレーキパッドを成形し高温における摩耗を比較し
た。実施例は、スチール繊維（長さ２ｍｍ、径９０μｍ
）の表面に三酸化アンチモンを施したものである。先ず
、フェノール樹脂のうちの６体積％をメタノールで溶か
したものと三酸化アンチモン１０体積％をらいかい機で
攪拌した。次に、この溶液とスチール繊維をヘンシェル
ミキサーで混合し、乾燥機で８０℃、１時間乾燥させ、
スチール繊維の表面に三酸化アンチモンと硬化フェノー
ル樹脂を施した。乾燥後、ヘンシェルミキサーで５ｍｍ
以下の粉体にした。そして、残りの組成物とヘンシェル
ミキサーで５分間攪拌し、１５０℃で１０分間プレスし
、所定形状のブレーキパッドを得た。その後、２００℃
で３時間アフターキュアを行った。比較例は、表１の組
成物をヘンシェルミキサーで５分間攪拌後、実施例と同
様にプレスし、アフターキュアを行ったものである。EXAMPLES The present invention will be explained in detail below based on Examples, but the present invention is not limited thereto. Table 1
Semi-metallic disc brake pads were molded using the friction material composition shown in Figure 2, and the wear at high temperatures was compared. In the example, steel fiber (length 2 mm, diameter 90 μm
) with antimony trioxide applied to its surface. First, 6% by volume of phenolic resin dissolved in methanol and 10% by volume of antimony trioxide were stirred using a sieve. Next, this solution and steel fibers were mixed in a Henschel mixer, dried in a dryer at 80°C for 1 hour,
Antimony trioxide and hardened phenolic resin were applied to the surface of the steel fiber. After drying, use a Henschel mixer to 5mm
It was made into the following powder. Then, the mixture was stirred with the remaining composition using a Henschel mixer for 5 minutes, and pressed at 150° C. for 10 minutes to obtain a brake pad in a predetermined shape. After that, 200℃
I did an after cure for 3 hours. In the comparative example, the composition shown in Table 1 was stirred for 5 minutes using a Henschel mixer, then pressed and after-cured in the same manner as in the example.
【００１２】0012
【表１】[Table 1]
【００１３】上記のような配合組成のセミメタリックデ
ィスクブレーキパッドを用いて、次のような条件で摩耗
試験を行った。
（１） 速度 ：１３０ｋｍ／ｈ温度
：２００℃
減速度 ：０．３Ｇ
制動回数：２００回
（２） 速度 ：６０ｋｍ／ｈ温度 ：
５００℃
減速度 ：０．３Ｇ
制動回数：２００回
（１）、（２）の条件で行った摩耗試験の結果を表２に
示す。[0013] Using a semi-metallic disc brake pad having the above-mentioned composition, a wear test was conducted under the following conditions. (1) Speed: 130km/h Temperature
: 200℃ Deceleration: 0.3G Number of braking: 200 times (2) Speed: 60km/h Temperature:
Table 2 shows the results of the wear test conducted under the following conditions: 500°C, deceleration: 0.3G, number of braking: 200 times (1) and (2).
【００１４】[0014]
【表２】
表２のごとく、実施例では高速・高温での摩耗を改良で
きた。[Table 2] As shown in Table 2, in the examples, wear at high speeds and high temperatures was improved.
【００１５】[0015]
【発明の効果】本発明によれば、スチール繊維の表面に
三酸化アンチモンを施すことによって、高速・高温で摩
耗が良好なセミメタリックディスクブレーキパッド等に
好適な摩擦材を得ることができる。According to the present invention, by applying antimony trioxide to the surface of steel fibers, it is possible to obtain a friction material suitable for semi-metallic disc brake pads and the like that exhibits good wear at high speeds and high temperatures.
【図１】スチール繊維の熱重量変化曲線を示すグラフで
ある。FIG. 1 is a graph showing a thermogravimetric change curve of steel fibers.
【図２】三酸化アンチモンを１０体積％加えたスチール
繊維の熱重量変化曲線を示すグラフである。FIG. 2 is a graph showing a thermogravimetric change curve of steel fibers containing 10% by volume of antimony trioxide.
Claims (2)
硬化性樹脂との混合物が施されたスチール繊維、熱硬化
性樹脂結合剤及び摩擦調整材よりなる組成物を加熱成形
してなることを特徴とする摩擦材。Claim 1: It is characterized by being formed by thermoforming a composition consisting of steel fibers whose surfaces are coated with a mixture of antimony trioxide and a hardened thermosetting resin, a thermosetting resin binder, and a friction modifier. friction material.
硬化性樹脂とを混合し、次いで熱硬化性樹脂を硬化させ
てスチール繊維の表面に三酸化アンチモンと硬化した熱
硬化性樹脂との混合物を施し、これを３ｍｍ〜５ｍｍの
粒子に造粒した後、この粒子と熱硬化性樹脂結合剤及び
摩擦調整剤を混合し、得られた組成物を加熱成形するこ
とを特徴とする摩擦材の製造法。2. Mix steel fibers, antimony trioxide, and a thermosetting resin, and then harden the thermosetting resin to apply a mixture of antimony trioxide and the hardened thermosetting resin to the surface of the steel fibers. A method for manufacturing a friction material, which comprises granulating this into particles of 3 mm to 5 mm, mixing the particles with a thermosetting resin binder and a friction modifier, and heat-molding the resulting composition. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12962291A JPH04353591A (en) | 1991-05-31 | 1991-05-31 | Friction material and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12962291A JPH04353591A (en) | 1991-05-31 | 1991-05-31 | Friction material and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04353591A true JPH04353591A (en) | 1992-12-08 |
Family
ID=15014034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12962291A Pending JPH04353591A (en) | 1991-05-31 | 1991-05-31 | Friction material and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04353591A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016098362A (en) * | 2014-11-26 | 2016-05-30 | 日本ブレーキ工業株式会社 | Friction material composition, friction material using friction material composition and friction member |
| JP2016121243A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2016121245A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2016121244A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2019214731A (en) * | 2019-08-08 | 2019-12-19 | 日本ブレーキ工業株式会社 | Friction material composition, friction material using friction material composition and friction member |
| JP2019214732A (en) * | 2019-08-08 | 2019-12-19 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member each using the friction material composition |
-
1991
- 1991-05-31 JP JP12962291A patent/JPH04353591A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016098362A (en) * | 2014-11-26 | 2016-05-30 | 日本ブレーキ工業株式会社 | Friction material composition, friction material using friction material composition and friction member |
| JP2016121243A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2016121245A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2016121244A (en) * | 2014-12-24 | 2016-07-07 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the same |
| JP2019214731A (en) * | 2019-08-08 | 2019-12-19 | 日本ブレーキ工業株式会社 | Friction material composition, friction material using friction material composition and friction member |
| JP2019214732A (en) * | 2019-08-08 | 2019-12-19 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member each using the friction material composition |
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