高硼硅玻璃产品的英文简介.doc

关于玻璃产品的英文简介 高硼硅玻璃 Borosilicate glass Borosilicate glass is a high silicate glass with at least 5% boron oxide bow handle threaded rod with a triangular shapedhandle. Borosilicate glass is a particular type of glass, better known under the brand names Pyrex n. 派热克斯玻璃（一种耐热玻璃） and Kimax. It was first develoed by German glassmaker Otto Schott in the late 19th century and sold under the brand name Duran in 1893. After Corning corningn. 细粒透镜v. 使成粒状（corn的ing形式） Glass Works developed Pyrex in 1924, it became a synonym sinnim n. 同义词；同义字for borosilicate glass in the English-speaking world.Borosilicate glass is the oldest type of glass to haveappreciable adj. 可评估的；可感知的；相当可观的resistance to thermal impact vt. 影响；撞击；冲突；压紧vi. 冲击；产生影响n. 影响；效果；碰撞；冲击力 and higher temperatures, also has excellent resistance to chemical attack.In this glass structure, the first to carry the Pyrex trademark, some of the SiO is replaced by boric oxide.Borosilicate glass has a low coefficient of thermal expansion and is, thus, suited for telescope mirrors and other precision parts. Also, because this glass can withstand thermal shock, it is used for oven and laboratory ware, headlamp hedlmp n. 桅灯；照明灯；车前灯lenses, and boiler gage glasses. Most borosilicate glasses have better resistance to acids than do soda-lime碱石灰 glasses, but poor resistance to alkalislklai n. 碱；可溶性无机盐adj. 碱性的. Glass fibers used in reinforcing plastic compounds kmpaund, kmpaund n. 化合物；混合物；复合词are a modified borosilicate glass.Chemical Composition SiO2 = 80% B2O3 = 13% Na2O +K2O= 4.3% Al2O3 = 2.4% Physical Properties Coefficient of expansion (20C300C) 3.3 x 10-6 K-1 Density 2.23g/cm3 Refractive index折射率： (Sodium D line) 1.474 Dielectric ,daiilektrik adj. 非传导性的；诱电性的n. 电介质；绝缘体constant 电容率(1MHz, 20C) 4.6 Specific heat比热 (20C) 750J/kgC 导热系数 (20C) 1.14W/mC Poissons Ratioreiiu, -u n. 比率，比例地基应力和变形泊松比(25C 400C) 0.2 Youngs Modulusmdjuls, -du-n. 模数；系数弹性模量，杨氏系数 (25C) 6400 kg/mm2 Optical Information Refractive index (Sodium D line) = 1.474 Visible light transmission, 透光率2mm thick glass = 92% Visible light transmission, 可见光穿透率5mm thick glass = 91%Critical Temperatures 150C - When working above this temperature care should be taken to heat and cool Borosilicate glass in a slow and uniform manner.500C - The maximum temperature that Borosilicate glass should be subjected to and then only for short period of no longer than a few minutes.510C - Temperature at which thermal stress can be introduced to Borosilicate glassware.565C - Annealing ni:l vt. 使退火，韧炼；锻炼n. 退火；锻炼，磨练temperature. When uniformly heated in controlled conditions, such as a kiln or oven thermal stresss can be removed.820C - Softening point at which Borosilicate may deform dif:m vt. 使变形；使成畸形vi. 变形；变畸形adj. 畸形的；丑陋的.1252C - Working point, the temperature that glassblowers need to attain in order to work Borosilicate glass.Working Temperatures Borosilicate glass retains its mechanical strength and will deform only at temperatures which approach its strain point应变点. The practical upper limit for operating temperatures is much lower and is controlled by the temperature ditterentials in the glass, which depend on the relative temperatures of the contents of the equipment and the external surroundings. Provided borosilicate glass is not subjected to rapid change in temperature, creating undue adj. 过度的，过分的；不适当的；未到期的thermal shock, it can be operated safely at temperatures up to 450F (232C). The normal limiting factor is actually the gasket skit n. 垫圈；衬垫；束帆索material. The degree of thermal shock (usually defined as sudden chilling tili adj. 寒冷的；冷漠的；使人恐惧的；令人寒心的；俚呱呱叫的n. 寒冷；冷却) which it can withstand depends on many factors, for example: stresses due to operating conditions; stresses imposed in supporting the equipment; the wall thickness of the glass, etc. It is therefore undesirable adj. 不良的；不受欢迎的；不合需要的to give an overall figure but, as a general guide, sudden temperature changes of up to about 216F (120C) can be accommodated .At sub-zero adj. 零下的；严寒的temperatures, the tensile adj. 物拉力的；可伸长的；可拉长的strength of borosilicate glass tends to increase and equipment