硼硅玻璃英文资料

Question

谁有关于高硼硅玻璃的英文资料及图片，或者在哪里能找到，帮帮忙啦
还可以追加分的，急急急急急急急急急

Answer 1

高硼硅玻璃英文名是Borosilicate glass，也有人称之为Pyrex glass。这里有一篇比较详细的介绍：

Borosilicate glass represents unmatched standardized glass for construction of plant and piping in the chemical, dyestuff, food pharmaceutical, petrochemical industries. Its steadily growing use is due to many advantages over conventional materials.

• Outstanding corrosion resistance
• Smooth pore free surface.
• Transparency
• Catalytic inertness.
• No effect on taste and odour.
• Physiological inertness.

Borosilicate glass is chosen for its unique chemical and physical properties. Borosilicate glass can be considered as being composed of oxides. Silica (SiO2) Magnesia (MgO) and lead oxide (PbO) are the principle modifiers/fluxes.
The chemical and physical properties of any glass depends on a varying degree on chemical composition of glass.

CHEMICAL COMPOSITION

The composition of borosilicate glass used for chemical plants has following approximate composion.
SiO2 - 80.6% B2 O2 - 12.5%
Na2O - 4.2% Al2O3 - 2.2%

RESISTANCE TO CHEMICAL

Borosilicate glass is inert to almost all materials except hydroflouric acid (HF) phosphoric acid((H3Po4) and hot strong caustic solutions. Of these Hydroflouric acid has the most serious effect, even when it is present in PPM (parts per million) in solutions. Where as phosphoric acid and caustic solutions cause no problems when cold but at elevatrd temprature corrosion occurs. in case of caustic solutions upto 30% concentration can be handled safely at ambient temperature.
Under actual operating conditions, the effect of turbulence, and traces of other chemicals in the solution may increase of decrease the rate of attack. So it is not possible to give exact figures for corrosion by caustic solutions.

THERMAL PROPERTIES

Linear coefficient of thermal expansion
The coefficient of thermal expansion of borosilicate glass over the temperature 0 - 300°C is 3.3 x 10-6/°C. This is very low when compared with other glasses and metals. That is why, borosilicate glass is often called low expansion borosilicate glass.
Specific heat
Specific heat between 25°C and 300°C is average to be 0.233Kcal/Kg, °C
Thermal Conductivity
Thermal conductivity is 1.0 Kcal/hr,m°C. Over the permissible operating temperature range.

ANNEALING

Annealing of glass is the process where the glass is heated and kept for a defined period of time to relive internal stresses. Careful cooling under controlled conditions is essential to ensure that no stresses are reintroduced by chilling/cooling.

RESHAPEING

In the given below are shown characteristic temperature at a determined viscosity, essential for glass reshap.

Lower cooling temperature 1024 poise 515°C
Upper cooling temperature 1013 poise 565°C
Softening point 107 poise 795°C
Reshapeing point 104 poise 120° C

MECHANICAL PROPERTIES

The lack of ductility of glass prevents the equalization of stresses at local irregularities or flaws and the breakage strength varies considerably about a mean value. This latter is found to occur at a tensile strength of about 700kg/cm2
In order to allow for the spread of breaking stress, a large factor of safely is applied when determining the wall thickness requirement to allow operation up to values given in the table of working pressure.

OPTICAL PROPERTIES

Borosilicate glass show no appreciable absorption in the visible region of spectrum and therefore appears clear and clour less.
In photo chemical processes the transparency of ultra violet is of particular importance. It follows from the transmittance of material in uv region that photo chemical reactions such as chlorination & sulpho chlorination can be performed in it.

WORKING TEMPERATURE

Borosilicate glass retains its mechanical strength and will deform only at temperature which approach its strain point. The practical upper limit for operating temperature is much lower and is controlled by the temperature differentials in the glass which depends on the relative temprature defferentials in the glass which depends on the relative temprature of the contens of the equipment and the external surroundings. Provided borosilicate glass is not subject to rapid change in temperature, creating undue thermal shock, it can be operated safety at temperatures up to 250 °C.
It must be realised that in complete plants, composed not only of borosilicate glass, but also includ other materials such as PTFE the recommended max. Operating temperature is 200°C. Operating temperatures may have to be modified so as to compensate for the effects of other factors such as pressure, thermal cycling, rapid heating cooling etc.
The degree of thermal shock (usually defined as sudden chilling or heating) which it can withstand depends on many factors such as stresses due to operating conditions, stresses imposed in supporting the equipment, the wall thickness of the glass. It is therefore undesirable to give sudden temperature changes. But up to 120 °C can be accomodated.
At sub-zero temperature, the tensile strength of borosilicate glass tends to increase and equipment can be used with safety at temperatures as low as -50 °C for XTRONG and components.

注：百度这里有很多相关的图片：
http://image.baidu.com/i?tn=baiduimage&ct=201326592&lm=-1&cl=2&fm=ps&word=%C5%F0%B9%E8%B2%A3%C1%A7

Answer 2

硼硅玻璃 Borosilicate_glass 简称BSG

Borosilicate glass is a type of heat-resistant glass. Borosilicate glass was first developed by German glassmaker Otto Schott in the late 19th century and sold under the brand name "Duran" in 1893. After Corning Glass Works introduced Pyrex in 1915, it became a synonym for borosilicate glass in the English-speaking world. Holophane manufactures original equipment lenses for street lights under the Endural brand name. Bomex is a brand of borosilicate glassware made in China for a number of resellers in the United States and abroad.

Most borosilicate glass is clear. Colored borosilicate, for the art glass trade, was first widely brought onto the market in 1986 when Paul Trautman founded Northstar Glassworks. There are now a number of small companies in the U.S. and abroad that manufacture and sell colored borosilicate glass for the art glass market.

In addition to the quartz, sodium carbonate, and calcium carbonate traditionally used in glassmaking, boron is used in the manufacture of borosilicate glass. Typically, the resulting glass composition is about 70% silica, 10% boric oxide, 8% sodium oxide, 8% potassium oxide, and 1% calcium oxide (lime). Though somewhat more difficult to make than traditional glass (Corning conducted a major revamp of their operations to make it), it is economical to produce because its superior durability, chemical and heat resistance finds excellent use in chemical laboratory equipment, cookware, lighting, and in certain cases, windows.

下面“参考资料”内是它的网址，另由一篇关于“低碱高硼硅玻璃蒙砂粉的研究”在以下网址http://epub.cnki.net/grid2008/detail.aspx?filename=BLTC200205002&dbname=CJFD2002可供下载，希望能帮到你

参考资料：http://www.answers.com/topic/borosilicate-glass