| 摘要 |
<p>Friction lining, esp. for coupling discs, comprises several layers of dissimilar compsn., partic. a friction or abrasion layer and a substrate. The former consists of a mixt. of loose, inorganic fibres esp. asbestos fibres and heavy-metal sulphides, (in)organic fillers and duroplasts. The latter comprises a composite of organic or synthetic fibres e.g. a textile or knitwear of jute, cellulose or a fleece or paper, polyester, etc. This composite contains an additive for increasing its thermal stability e.g. an inorganic salt(s) esp. inorganic-acid alkali salt such as Na2HPO4, NH4Cl, Na2SO4 or water glass. This allows use of short asbestos fibres hence resulting in relatively inexpensive prod.) without adverse effect on breaking strength and crushing resistance.</p> |
