JPH08113658A - Friction material for braking device and its production - Google Patents
Friction material for braking device and its productionInfo
- Publication number
- JPH08113658A JPH08113658A JP27433594A JP27433594A JPH08113658A JP H08113658 A JPH08113658 A JP H08113658A JP 27433594 A JP27433594 A JP 27433594A JP 27433594 A JP27433594 A JP 27433594A JP H08113658 A JPH08113658 A JP H08113658A
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- JP
- Japan
- Prior art keywords
- friction material
- friction
- fibers
- fiber
- ceramic
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、各種車両や産業用機械
の制動装置における摩擦材およびその製造法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material in a braking device for various vehicles and industrial machines and a method for manufacturing the friction material.
【０００２】[0002]
【従来の技術】自動車その他の車両や産業用機械におい
て使用される制動装置を構成する摩擦材としては従来さ
まざまなものが使われているが、一般的なものは、石
綿、セラミック繊維等の無機繊維、耐熱性有機繊維、金
属繊維等の繊維質材料の１種または２種以上の混合物を
基材とし、これに摩擦調整材その他の添加剤を混合した
ものを、フェノール樹脂等の熱硬化性合成樹脂を結合剤
に用いて熱圧成形したものである。2. Description of the Related Art Conventionally, various friction materials have been used as a friction material constituting a braking device used in automobiles and other vehicles and industrial machines. Generally, inorganic materials such as asbestos and ceramic fibers are used. Fibers, heat-resistant organic fibers, metal fibers and other fibrous materials are used as a base material, and a mixture of these materials with friction modifiers and other additives is used as a thermosetting material such as phenol resin. It is a product obtained by thermocompression molding using a synthetic resin as a binder.
【０００３】摩擦材には、制動能力に直接関係がある摩
擦係数とその温度特性のほかに、耐摩耗性、機械的強
度、相手金属材料に対する攻撃性、制動中の“鳴き”
等、多くの特性が用途に応じて問題となるが、これらの
特性は上述の成形材料の組み合わせを工夫することによ
り調整される。In addition to the friction coefficient and its temperature characteristics, which are directly related to braking ability, friction materials include wear resistance, mechanical strength, aggressiveness to mating metal materials, and "squeal" during braking.
Many characteristics such as the above become problems depending on the application, but these characteristics are adjusted by devising a combination of the above-mentioned molding materials.
【０００４】制動中の鳴きの防止に関しては、摩擦材中
に微細な気孔を導入するとよいことが知られており、そ
のために有効な手段として、結合剤の使用量を減らす方
法、基材の繊維質材料に長繊維を使用する方法、バーミ
キュライトのような多孔質材料を配合する方法、成形時
に材料の充填量を少なくする方法、等が提案されてい
る。Regarding the prevention of squeal during braking, it is known that fine pores should be introduced into the friction material. As an effective means therefor, a method of reducing the amount of binder used, a fiber of the base material There have been proposed methods such as using long fibers as a quality material, blending a porous material such as vermiculite, and reducing a filling amount of the material during molding.
【０００５】しかしながら、鳴きを防止するためのこれ
ら従来の方法は、摩擦材の強度や耐摩耗性が顕著に低下
するという問題点がある。また、バーミキュライトのよ
うな多孔質材料は耐熱性が低いので、これを充填すると
高温における摩擦材の特性、特に耐摩耗性が悪くなると
いう問題点があった。However, these conventional methods for preventing squeal have a problem that the strength and wear resistance of the friction material are significantly reduced. Further, since a porous material such as vermiculite has low heat resistance, there is a problem in that when it is filled, the characteristics of the friction material at high temperatures, particularly the wear resistance, deteriorates.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、機械
的強度、制動特性等、摩擦材として必要な基本特性に優
れ、しかも制動中の鳴きが少ない、改良された摩擦材お
よびその製造法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an improved friction material having excellent basic properties required for a friction material, such as mechanical strength and braking characteristics, and having less squeal during braking, and a method for producing the same. To provide.
【０００７】[0007]
【課題を解決するための手段】本発明により提供された
制動装置用摩擦材は、繊維質材料および摩擦調整材の混
合物が熱硬化性合成樹脂を結合剤として成形されてなる
制動装置用摩擦材において、摩擦調整材の一部として、
繊維長５〜７００μm、平均繊維長５０〜１５０μmの微
細化されたセラミック繊維からなる平均粒径０.５〜２m
m、嵩密度０.１〜０.２g/cm3のセラミック繊維粒状集合
体が、その多孔性を維持したまま摩擦材中に分散してい
ることを特徴とするものである。DISCLOSURE OF THE INVENTION The friction material for a braking device provided by the present invention is a friction material for a braking device in which a mixture of a fibrous material and a friction modifier is molded using a thermosetting synthetic resin as a binder. In, as part of the friction modifier,
An average particle size of 0.5 to 2 m made of finely divided ceramic fibers having a fiber length of 5 to 700 μm and an average fiber length of 50 to 150 μm
The ceramic fiber granular aggregate having m and a bulk density of 0.1 to 0.2 g / cm 3 is dispersed in the friction material while maintaining its porosity.
【０００８】本発明はまた、上記摩擦材の製造法、すな
わち繊維長が５〜７００μm、平均繊維長が５０〜１５
０μmの微細化されたセラミック繊維が集合してなる平
均粒径０.５〜２mm、嵩密度０.１〜０.２g/cm3、締まり
性４０％以上のセラミック繊維粒状集合体を摩擦調整材
の一部として配合した摩擦材製造原料を混合し、熱圧成
形することを特徴とする制動装置用摩擦材の製造法を提
供するものである。The present invention also provides a method for producing the above friction material, that is, a fiber length of 5 to 700 μm and an average fiber length of 50 to 15
A friction modifier is a ceramic fiber granular aggregate having an average particle size of 0.5 to 2 mm, a bulk density of 0.1 to 0.2 g / cm 3 , and a tightness of 40% or more, which is an aggregate of finely divided 0 μm ceramic fibers. The present invention provides a method for producing a friction material for a braking device, which comprises mixing the raw materials for producing a friction material blended as a part of the above and hot-pressing.
【０００９】本発明による摩擦材においては、多孔性を
維持したまま摩擦材中に分散している上記セラミック繊
維粒状集合体のそれぞれによって、直径約０.５〜２mm
の範囲に高密度で偏在する微細気孔群が導入されてい
る。それにより摩擦材中に多数点在する微細気孔群は摩
擦材の鳴きを防止するが、微細なセラミック繊維によっ
て支持されているので、摩擦材の強度、制動特性等には
悪影響を及ぼさない。In the friction material according to the present invention, each of the above-mentioned ceramic fiber granular aggregates dispersed in the friction material while maintaining the porosity has a diameter of about 0.5 to 2 mm.
In this range, a group of fine pores with high density and uneven distribution are introduced. As a result, a large number of fine pores scattered in the friction material prevent the friction material from squeaking, but since it is supported by the fine ceramic fibers, it does not adversely affect the strength and braking characteristics of the friction material.
【００１０】以下、本発明による摩擦材の製造法につい
て詳述する。本発明の摩擦材を製造するには、一種の摩
擦調整材として、微細化セラミック繊維の粒状集合体を
用いる。この材料は、繊維長５〜７００μm、平均繊維
長５０〜１５０μmの微細化されたセラミック繊維が集
合して平均粒径０.５〜２mm、嵩密度０.１〜０.２g/cm3
の粒状物を形成してなるものであり、望ましくはその締
まり性が４０％以上のものである。The method of manufacturing the friction material according to the present invention will be described in detail below. To produce the friction material of the present invention, a granular aggregate of finely divided ceramic fibers is used as a kind of friction modifier. This material has an average particle diameter of 0.5 to 2 mm and a bulk density of 0.1 to 0.2 g / cm 3 by assembling finely divided ceramic fibers having a fiber length of 5 to 700 μm and an average fiber length of 50 to 150 μm.
The granularity is formed to have a tightness of 40% or more.
【００１１】なお、“嵩密度”および“締まり性”は下
記の方法で測定される値である。嵩密度測定法：垂直に
立てた内径１５０mmの金属製円筒に試料１００ｇを入れ
て円筒開口面１cm2当たり５０ｇの荷重をおもりにより
加える。５分後に試料の高さを測定して体積Ｖ（cm3）
を求める。 嵩密度（g/cm3）＝１００／ＶThe "bulk density" and "tightness" are values measured by the following method. Bulk density measuring method: 100 g of a sample is put in a vertically standing metal cylinder having an inner diameter of 150 mm, and a load of 50 g per 1 cm 2 of the opening surface of the cylinder is applied by a weight. After 5 minutes, measure the height of the sample and measure the volume V (cm 3 ).
Ask for. Bulk density (g / cm 3 ) = 100 / V
【００１２】締まり性試験方法：５００mlのメスシリン
ダーに水５００mlと試料１０ｇを入れ、軽く撹拌して３
０分間静置した後、セラミック繊維沈降層の体積Ｖ1を
測定する。別に試料１０ｇを容積５００mlのビーカーに
とり、水５００mlを加えてプロペラ式撹拌機（回転数７
００rpm）で３分間撹拌する。その後、ビーカー内のセ
ラミック繊維懸濁液全量を５００mlのメスシリンダーに
移し、３０分間静置した後、セラミック繊維沈降層の体
積Ｖ2を測定する。測定されたＶ1，Ｖ2より、次式によ
り締まり性を算出する。 締まり性（％）＝〔１−（Ｖ2−Ｖ1）／Ｖ1〕×１００Tightness test method: 500 ml of water and 10 g of sample are put into a 500 ml graduated cylinder, and lightly stirred to 3
After standing for 0 minutes, the volume V 1 of the ceramic fiber sedimentation layer is measured. Separately, place 10 g of a sample in a beaker having a volume of 500 ml, add 500 ml of water, and mix with a propeller stirrer (rotation speed 7
(00 rpm) for 3 minutes. Then, the total amount of the ceramic fiber suspension in the beaker is transferred to a 500 ml graduated cylinder and allowed to stand for 30 minutes, after which the volume V 2 of the ceramic fiber sedimentation layer is measured. From the measured V 1 and V 2 , the tightness is calculated by the following formula. Interference resistance (%) = [1- (V 2 -V 1) / V 1 ] × 100
【００１３】上記セラミック繊維粒状集合体は、その粒
径よりも短い微細化セラミック繊維からなるにもかかわ
らず、また結合剤等の成形助剤が使われていないにもか
かわらず、繊維の集合状態はきわめて安定である。特に
締まり性が４０％以上のものは、通常の取り扱いや成形
材料としての利用過程で単繊維に分散することはほとん
どない。これは、剛性の高いセラミック繊維同士が交差
して互に支え合い、あたかも小枝で作られた鳥の巣のよ
うに安定な三次元網目構造を形成しているためと推察さ
れる（後出図１参照）。The above-mentioned ceramic fiber granular aggregate is composed of finely divided ceramic fibers having a particle size shorter than its particle size, and despite the fact that a molding aid such as a binder is not used, the aggregated state of the fibers. Is extremely stable. In particular, those having a tightness of 40% or more are hardly dispersed in the single fiber during the normal handling or the use process as a molding material. It is speculated that this is because the highly rigid ceramic fibers cross each other and support each other, forming a stable three-dimensional network structure like a bird's nest made of twigs (see below). 1).
【００１４】このセラミック繊維粒状集合体は、粉体の
造粒に使われている周知の撹拌式造粒機を用いて製造す
ることができる。すなわち、繊維長５〜７００μm、平
均繊維長５０〜１５０μmの微細化されたセラミック繊
維を撹拌式造粒機に入れて撹拌すればよい。このとき、
結合剤は加えない。This ceramic fiber granular aggregate can be manufactured by using a well-known stirring type granulator used for granulating powder. That is, finely divided ceramic fibers having a fiber length of 5 to 700 μm and an average fiber length of 50 to 150 μm may be put in an agitation granulator and stirred. At this time,
No binder is added.
【００１５】通常、原料繊維は梱包中で圧縮されて大小
さまざまな塊を形成している。これを造粒機中で撹拌す
ると、塊の解砕と単繊維の再集合が進み、粒径の揃った
繊維集合体が形成されてくる。撹拌速度は繊維集合体の
粒径に影響を与える。集合したセラミック繊維同士は、
最初はルーズな係合状態にあるが、撹拌にともなう圧縮
応力を受けることにより徐々に充填密度の高い集合体を
形成する。そして、さらに撹拌を続けると、嵩密度の形
で測定される充填密度はあまり変わらないが繊維が安定
な状態をとるようになるためか、前述の締まり性が良い
安定な集合状態になる。[0015] Usually, the raw material fibers are compressed in a package to form lumps of various sizes. When this is agitated in a granulator, crushing of lumps and reassembling of single fibers proceed, and a fiber aggregate having a uniform particle size is formed. The stirring speed affects the particle size of the fiber aggregate. The assembled ceramic fibers are
Although initially in a loose engagement state, it receives a compressive stress associated with stirring to gradually form an aggregate having a high packing density. Then, if the stirring is further continued, the packing density measured in the form of bulk density does not change so much, but the fibers come to a stable state, and the stable aggregation state with good tightness described above is obtained.
【００１６】締まり性が４０％未満の粒状集合体は、摩
擦材製造過程で他の原料と激しく撹拌混合されるとセラ
ミック繊維が解離し易く、集合状態を維持することがで
きない。したがって、摩擦材製造を容易にするには見か
け上の粒状集合体が完成した後も暫く撹拌を続けること
により、締まり性が４０％以上の状態を実現することが
望ましい。If the granular aggregate having a tightness of less than 40% is vigorously stirred and mixed with other raw materials in the process of manufacturing the friction material, the ceramic fibers are easily dissociated and the aggregated state cannot be maintained. Therefore, in order to facilitate the production of the friction material, it is desirable to achieve a tightness of 40% or more by continuing stirring for a while even after the apparent granular aggregate is completed.
【００１７】原料のセラミック繊維は特に限定されるも
のではないが、アルミノシリケート繊維が、安価に且つ
容易に入手でき、物性の点でも好ましく、造粒も容易な
ので最も好ましい。他に適当なセラミック繊維として
は、ロックウール、アルミナ繊維、炭素繊維等がある。
なお、通常入手容易なセラミック繊維は長さが数ミリメ
ートル以上のものであるが、これを上記粒状集合体の製
造に適当な長さのものに微細化するには、湿式または乾
式の粉砕機で処理すればよい。The ceramic fiber as a raw material is not particularly limited, but an aluminosilicate fiber is most preferable because it is inexpensive and easily available, physical properties are preferable, and granulation is easy. Other suitable ceramic fibers include rock wool, alumina fibers, carbon fibers and the like.
The ceramic fiber that is usually easily available has a length of several millimeters or more. To make it finer into particles of an appropriate length for producing the above-mentioned granular aggregate, a wet or dry pulverizer is used. Just process it.
【００１８】上述のセラミック繊維粒状集合体を、摩擦
材製造原料混合工程において、望ましくは原料全体の５
〜２０重量％程度配合する。５重量％に満たない量では
配合効果が十分でなく、一方、配合率が２０重量％を超
えると摩擦材の強度低下が顕著になる。In the friction material manufacturing raw material mixing step, the above-mentioned ceramic fiber granular aggregate is preferably mixed with 5 parts of the whole raw material.
Approximately 20% by weight is compounded. If the amount is less than 5% by weight, the compounding effect is not sufficient. On the other hand, if the amount is more than 20% by weight, the strength of the friction material is significantly reduced.
【００１９】セラミック繊維粒状集合体は、前述のよう
に摩擦調整材の一種として使用するものである。したが
って、本発明による摩擦材の製造においては、これ以外
に、一般的な摩擦材製造において通常使用される原材料
を適宜使用する。すなわち、石綿、アルミノシリケート
質繊維、アルミナ繊維等のセラミック繊維；ガラス繊
維；ポリイミド繊維、芳香族ポリアミド繊維等の耐熱性
有機繊維；銅、黄銅、鋼等からなる金属繊維等の繊維質
基材のほか、シリカ、黒鉛、硫化モリブデン、窒化ケイ
素、窒化ホウ素、金属粉、硫酸バリウム、ウォラストナ
イト、カシューダスト、熱硬化性合成樹脂硬化物粉砕物
等の１種または２種以上を、摩擦特性調整その他の目的
で併用することができる。The ceramic fiber granular aggregate is used as a kind of friction modifier as described above. Therefore, in the production of the friction material according to the present invention, in addition to this, raw materials usually used in the production of general friction materials are appropriately used. That is, ceramic fibers such as asbestos, aluminosilicate fibers, and alumina fibers; glass fibers; heat-resistant organic fibers such as polyimide fibers and aromatic polyamide fibers; fibrous base materials such as metal fibers made of copper, brass, steel, etc. In addition, one or more of silica, graphite, molybdenum sulfide, silicon nitride, boron nitride, metal powder, barium sulfate, wollastonite, cashew dust, crushed product of thermosetting synthetic resin, and the like are used to adjust friction characteristics. It can be used together for other purposes.
【００２０】結合剤として用いる熱硬化性合成樹脂も限
定されるものではなく、ノボラック型もしくはレゾール
型のフェノール樹脂、変性フェノール樹脂等、通常使用
されるものを用いることができる。The thermosetting synthetic resin used as the binder is not limited, and a commonly used one such as novolac type or resol type phenol resin or modified phenol resin can be used.
【００２１】使用する全原料はなるべく均一に混合する
が、セラミック繊維粒状集合体はその多孔質粒状構造が
破壊されないよう、他の原料の均一混合が終わってから
添加し混合することが望ましい。All the raw materials to be used are mixed as uniformly as possible, but it is desirable to add and mix the other raw materials after the uniform mixing of other raw materials so that the porous granular structure of the ceramic fiber granular aggregate is not destroyed.
【００２２】原料混合物を常法により所定の形状に熱圧
成形すれば、本発明の摩擦材が得られる。セラミック繊
維粒状集合体は、通常の熱圧成形によっては扁平化した
り単繊維に分散したりせずに原形を維持する。また、そ
の気孔中に結合剤等が入りこんで多孔質構造が失われる
こともない。したがって、製品はセラミック繊維粒状集
合体がその多孔性を失うことなく均一に導入されたもの
となる。The friction material of the present invention can be obtained by thermocompression molding the raw material mixture into a predetermined shape by a conventional method. The ceramic fiber granular aggregate maintains its original shape without being flattened or dispersed into single fibers by ordinary thermocompression molding. In addition, the porous structure is not lost due to the binder and the like entering into the pores. Therefore, the product is a uniform introduction of the ceramic fiber granular aggregate without losing its porosity.
【００２３】[0023]
【実施例】アルミノシリケート質繊維（市販品，Ａl2Ｏ
3５０％，ＳiＯ2５０％）を乾式粉砕機で処理して、９
５重量％以上が繊維長５〜５００μmの範囲にあり平均
繊維長が１００μmの微細化繊維を得た。これを撹拌式
造粒機に入れて撹拌した。原料繊維は最初は大きさが不
揃いの塊をなしていたが、撹拌を続けるうちに塊は解砕
され、一方で小さな粒状物への集合が進み、直径が０.
１〜５mm程度、大部分が０.５〜２mmの、粒状集合体だ
けが認められるようになった。[Example] Aluminosilicate fiber (commercial item, Al 2 O
3 50%, SiO 2 50%) was treated with a dry crusher to obtain 9
Finely divided fibers having an average fiber length of 100 μm and having a fiber length of 5% by weight or more in an amount of 5 to 500 μm were obtained. This was put in a stirring granulator and stirred. Initially, the raw material fibers formed lumps with irregular sizes, but the lumps were crushed as the stirring was continued, and on the other hand, the aggregates into small granules progressed and the diameter was reduced to 0.
Only granular aggregates having a size of about 1 to 5 mm and mostly 0.5 to 2 mm have been recognized.
【００２４】６分間撹拌後、嵩密度０.１４７g/cm3、締
まり性９５％、平均粒径１.２mmのセラミック繊維粒状
集合体が得られた（図１はこのセラミック繊維粒状集合
体の走査電子顕微鏡写真である。）。After stirring for 6 minutes, a ceramic fiber granular aggregate having a bulk density of 0.147 g / cm 3 , a tightness of 95%, and an average particle diameter of 1.2 mm was obtained (FIG. 1 shows scanning of this ceramic fiber granular aggregate). It is an electron micrograph.).
【００２５】次に、表１のようにセラミック繊維粒状集
合体を用いまたは用いずに、アラミド繊維８重量部、フ
ェノール樹脂２０重量部、カシューダスト５重量部、お
よび硫酸バリウムの混合物を熱圧成形して、摩擦材 No.
１〜５を製造した。セラミック繊維粒状集合体を用いな
い対照例 No.２,３において用いた未造粒セラミック繊
維は粒状集合体製造に用いたものである。Next, as shown in Table 1, a mixture of 8 parts by weight of aramid fiber, 20 parts by weight of phenol resin, 5 parts by weight of cashew dust, and barium sulfate was thermocompression-molded with or without the ceramic fiber granular aggregate. Then, the friction material No.
1-5 were produced. The ungranulated ceramic fibers used in Comparative Examples Nos. 2 and 3 which did not use the ceramic fiber granular aggregate were those used in the production of the granular aggregate.
【００２６】[0026]
【表１】 No.１ No.２ No.３ No.４ No.５ セラミック繊維粒状集合体 − − − ５部 １０部 セラミック繊維（未造粒） − ５部 １０部 − − 硫酸バリウム ６７部 ６２部 ５７部 ６２部 ５７部[Table 1] No. 1 No. 2 No. 3 No. 4 No. 5 Ceramic fiber granular aggregate − − − 5 parts 10 parts Ceramic fiber (ungranulated) − 5 parts 10 parts − − Barium sulfate 67 parts 62 Part 57 Part 62 Part 57 Part
【００２７】得られた各摩擦材について気孔率と曲げ強
度を測定し、セラミック繊維含有率との関係を示す表に
まとめたのが表２および表３である。これらの表を見る
と、セラミック繊維粒状集合体を配合した摩擦材 No.
４,５においてはその曲げ強度をあまり低下させずに気
孔率を高くできたことがわかる。なお、図２に示したよ
うに、配合したセラミック繊維粒状集合体１は粒状集合
体のまま摩擦材２中に均一に分布しており、また、各セ
ラミック繊維粒状集合体１は図３，４の電子顕微鏡写真
（摩擦材の研磨面の写真）が示すように多孔性を維持し
ていた。The porosity and bending strength of each of the obtained friction materials were measured, and Tables 2 and 3 show the relationship between the content of the ceramic fibers and the table. Looking at these tables, the friction material No. containing the ceramic fiber granular aggregate was compounded.
It can be seen that in Nos. 4 and 5, the porosity could be increased without significantly lowering the bending strength. As shown in FIG. 2, the blended ceramic fiber granular aggregate 1 is evenly distributed in the friction material 2 as it is, and each ceramic fiber granular aggregate 1 is shown in FIGS. Porosity was maintained as shown in the electron micrograph (photograph of the polished surface of the friction material).
【００２８】[0028]
【表２】 気孔率（％）の変化 セラミック繊維含有率 ０％ ５％ １０％ 粒状集合体配合品 ４.２ ５.２ ８.２ 未造粒繊維使用品 ４.２ ４.２ ６.３ [Table 2] Change in porosity (%) Ceramic fiber content 0% 5% 10% Granular aggregate compounded product 4.2 5.2 8.2 Non-granulated fiber product 4.2 4.2 6.3
【００２９】[0029]
【表３】 曲げ強度（kgf/cm2）の変化 セラミック繊維含有率 ０％ ５％ １０％ 粒状集合体配合品 ６.２ ６.３ ５.６ 未造粒繊維使用品 ６.１ ６.５ ６.８ [Table 3] Changes in bending strength (kgf / cm 2 ) Ceramic fiber content 0% 5% 10% Granular aggregate blended product 6.2 6.3 5.6 Non-granulated fiber product 6.1 6.5 6.5 6.8
【００３０】次に、摩擦材No.５（本発明品）および N
o.３（対照例）について摩耗試験機による摩耗試験を、
ＪＩＳ Ｄ４４１１「自動車用ブレーキライニング」に
準じて行なった。また、鳴きの発生についても試験し
た。その結果を表４に示す。Next, friction materials No. 5 (product of the present invention) and N
Wear test by a wear tester for o.3 (control example)
It was performed according to JIS D4411 "Brake lining for automobiles". The generation of squeaking was also tested. The results are shown in Table 4.
【００３１】[0031]
【表４】 No.５(本発明品) No.３(対照例) 摩耗率(×10-7cm3/kg・m) １００℃ １.６ １.５ １５０℃ １.１ １.０ ２００℃ １.３ １.２ ２５０℃ １.５ １.５ 鳴きの発生 無し 有り[Table 4] No. 5 (Invention product) No. 3 (Comparative example) Abrasion rate (× 10 -7 cm 3 / kgm) 100 ° C 1.6 1.5 1.5 150 ° C 1.1 1.0 200 ℃ 1.3 1.2 250 ℃ 1.5 1.5 No squeal occurrence Yes
【００３２】[0032]
【発明の効果】上述のように、セラミック繊維粒状集合
体を配合する本発明によれば強度や耐摩耗性を低下させ
ることなしに微細な気孔を摩擦材に導入し、摩擦材によ
る制動中の鳴きを防止することができる。As described above, according to the present invention in which the ceramic fiber granular aggregate is blended, fine pores are introduced into the friction material without lowering the strength and the wear resistance, and during braking by the friction material. Squeaking can be prevented.
【図１】 本発明において用いるセラミック繊維粒状集
合体の一例の走査電子顕微鏡写真（倍率３０倍）であ
る。FIG. 1 is a scanning electron micrograph (magnification: 30 times) of an example of a ceramic fiber granular aggregate used in the present invention.
【図２】 本発明による摩擦材におけるセラミック繊維
粒状集合体の分布を示す表面図である。FIG. 2 is a surface view showing a distribution of ceramic fiber granular aggregates in a friction material according to the present invention.
【図３】 本発明による摩擦材におけるセラミック繊維
粒状集合体の存在状態を示す摩擦材研磨面の走査電子顕
微鏡写真（倍率１００倍）である。FIG. 3 is a scanning electron micrograph (magnification: 100 times) of a polished surface of a friction material showing a state where a ceramic fiber granular aggregate is present in the friction material according to the present invention.
【図４】 本発明による摩擦材におけるセラミック繊維
粒状集合体の存在状態を示す摩擦材研磨面の走査電子顕
微鏡写真（倍率４００倍）である。FIG. 4 is a scanning electron micrograph (magnification: 400 times) of a polished surface of a friction material showing a state in which a ceramic fiber granular aggregate is present in the friction material according to the present invention.
１：セラミック繊維粒状集合体 ２：摩擦材 1: Ceramic fiber granular aggregate 2: Friction material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 片桐 浩 長野県上水内郡牟礼村大字牟礼396 (72)発明者 宮澤 英之 長野県上水内郡牟礼村大字牟礼396 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Katagiri 396, Muremura, Kuremizunai-gun, Nagano Prefecture 396 (72) Hideyuki Miyazawa 396, Muremura, Kuremizuuchi-gun, Nagano Prefecture
Claims (2)
熱硬化性合成樹脂を結合剤として成形されてなる制動装
置用摩擦材において、摩擦調整材の一部として、繊維長
５〜７００μm、平均繊維長５０〜１５０μmの微細化さ
れたセラミック繊維からなる平均粒径０.５〜２mm、嵩
密度０.１〜０.２g/cm3のセラミック繊維粒状集合体
が、その多孔性を維持したまま摩擦材中に分散している
ことを特徴とする制動装置用摩擦材。1. A friction material for a braking device, wherein a mixture of a fibrous material and a friction modifier is molded by using a thermosetting synthetic resin as a binder, and as a part of the friction modifier, a fiber length of 5 to 700 μm, average A ceramic fiber granular aggregate having an average particle diameter of 0.5 to 2 mm and a bulk density of 0.1 to 0.2 g / cm 3 made of finely divided ceramic fibers having a fiber length of 50 to 150 μm, while maintaining its porosity. A friction material for a braking device characterized by being dispersed in the friction material.
５０〜１５０μmの微細化されたセラミック繊維が集合
してなる平均粒径０.５〜２mm、嵩密度０.１〜０.２g/c
m3、締まり性４０％以上のセラミック繊維粒状集合体を
摩擦調整材の一部として配合した摩擦材製造原料を混合
し、熱圧成形することを特徴とする制動装置用摩擦材の
製造法。2. An average particle diameter of 0.5 to 2 mm and a bulk density of 0.1 to 0.2 g / which is an aggregate of finely divided ceramic fibers having a fiber length of 5 to 700 μm and an average fiber length of 50 to 150 μm. c
A method for producing a friction material for a braking device, which comprises mixing a raw material for producing a friction material, in which a granular ceramic fiber aggregate having m 3 and a tightness of 40% or more is blended as a part of a friction adjusting material, and hot pressing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27433594A JPH08113658A (en) | 1994-10-14 | 1994-10-14 | Friction material for braking device and its production |
| US08/542,595 US5830566A (en) | 1994-10-14 | 1995-10-13 | Friction material for dampers and process for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27433594A JPH08113658A (en) | 1994-10-14 | 1994-10-14 | Friction material for braking device and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08113658A true JPH08113658A (en) | 1996-05-07 |
Family
ID=17540231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27433594A Pending JPH08113658A (en) | 1994-10-14 | 1994-10-14 | Friction material for braking device and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08113658A (en) |
-
1994
- 1994-10-14 JP JP27433594A patent/JPH08113658A/en active Pending
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