Tham khảo tài liệu 'materials handbook 15th ed - g. brady_ h. clauser_ j. vaccari (mcgraw-hill_ 2002) episode 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1040 WILLOW have made these alloys obsolete. The bearing alloy known in England as motor bronze is a babbitt with about twice the copper of a standard babbitt. One analysis gives tin 84 antimony copper and bismuth 1. An old alloy used in India for utensils and known as bidery metal contained 31 parts zinc 1 lead and 2 copper fluxed with resins. It was finished with a velvety-black color by treating with a solution of copper sulfate. A white metal sheet now much used for making stamped and formed parts for costume jewelry and electronic parts is zinc with up to copper and up to titanium. The titanium with the copper prevents coarse-grain formation raising the recrystallization temperature. The alloy weighs 2 less than copper and it plates and solders easily. Zilloy-20 is pure zinc with no more than 1 of other elements. In rolled strip it has a tensile strength up to 27 000 lb in2 186 MPa and elongation of 35 . WILLOW. The wood of the trees Salix coerulea and S. alba native to Europe but grown in many other places. It is best known as a material for cricket bats made in England. The American willows are known as black willow from the tree S. nigra and western black willow from the tree S. lasiandra. The wood is also employed for making artificial limbs and for articles where toughness and nonshrinking qualities are valued. The wood is brownish yellow has a fine open grain and has a density of about 30 lb ft3 481 kg m3 . It is of the approximate hardness of cherry and birch. Japanese willow is from the tree S. urbaniana. It has a closer and finer texture and a browner color. Black willow has a maximum crushing strength parallel to the grain of about 1 500 lb in2 10 MPa . Salicin also called salicoside and saligenin is a glucoside extracted from several species of willow bark of England and also from the American aspen. It is a colorless crystalline material of composition OH 4C6H7 OO C6H4CH2OH decomposing at 394 F 201 C and soluble in water and in .
