欧美性大战久久久久久久蜜桃_开心婷婷久久_在线免费观看视频一区二区_色妞色综合久久夜夜_jjzz18国产_无码影片一区二区三区

Welcome To Jiyuan Zhengyu Industrial Co., Ltd. Official website!

Jiyuan Zhengyu Industrial Co., Ltd.
濟源正宇實業(yè)有限公司
濟源正宇實業(yè)有限公司
濟源正宇實業(yè)有限公司

News

Location:Home > News

Main raw materials of high borosilicate glass tube

發(fā)布時間:2019-01-11 09:57:36 文章來源:nvhdufom 點擊次數(shù):3176次

  According to the properties of the introduced oxides, they are divided into acid oxides, alkali oxides and alkaline earth oxides.

  (1) Acidic oxide raw materials: SiO 2, B2O 3, Al2O3 and other raw materials. SiO 2 is the skeleton of glass structure in silicate glass. It gives glass high strength, good chemical stability, heat resistance and low expansion, but it will increase the melting temperature and viscosity of glass. Silica sand, sandstone and quartzite are the raw materials for SiO 2. The addition of B2O 3 in glass can reduce the thermal expansion of glass, improve the refractive index, heat resistance and chemical corrosion resistance, reduce the viscosity of glass at higher temperature, and increase the viscosity of glass at lower temperature. The reference material of B2O3 is borax or boric acid. The addition of Al2O3 in glass can reduce the crystallization tendency and enhance the chemical stability, increase the strength and increase the glass viscosity. Feldspar with K2O or Na2O and SiO2 is usually used as raw materials, and industrial alumina can also be used. Cangzhou Tianchang Craft Glass Products Factory specializes in producing various types of high borosilicate glass tubes

  (2) Alkali metal oxide raw materials: Na2O, K2O raw materials. The addition of Na2O and K2O in glass can reduce melting temperature and viscosity, but make the chemical stability of glass worse. The reference materials are soda ash (Na2CO3) and potassium alkali (K2CO3).

  (3) Alkaline earth metal oxide raw materials: CaO, MgO, BaO, ZnO, PbO raw materials. The addition of CaO and MgO in glass can weaken the crystallization tendency of sodium silicate glass and enhance its chemical stability. At high temperature, it can reduce the glass viscosity and promote the melting and clarification of glass. However, when the temperature decreases, the viscosity increases rapidly and the forming operation is difficult. The raw materials used are limestone (CaCO3) and magnesite (MgCO3), or dolomite containing both CaO and MgO. BaO and ZnO are often added to glass to regulate its chemical stability and refractive index. Industrial ZnO and BaCO3, BaSO4 or Ba(NO3)2 are often used as raw materials. The addition of PbO in glass can significantly improve the refractive index and dispersion, make the glass absorb short-wavelength radiation, at the same time, the specific gravity increases, the melting temperature decreases, and the wettability with metal is good. The raw materials of lead oxide are red and yellow red or industrial lead nitrate.

  In addition, broken glass is also a major raw material, often known as clinker, which can melt at lower temperatures, and help to melt glass batches.


  • 13653912512
    PHONE
  • 13653912512
    MASSAGE
  • map
    MAP
  • ewm
    QRCODE
  • TOP

    QQ

    86 18021577953

    主站蜘蛛池模板: 久久人人爽人人人人爽AV | 3344在线看片免费 | 亚洲乱码一区二区三区在线观看 | 国产成人不卡 | 久久久观看 | 高清乱码毛片不卡 | 可以看的黑人性较视频 | 久久这里只有精品99 | 亚洲日韩国产一区二区三区 | 国产精品国内免费一区二区三区 | av无码天堂一区二区三区, | 欧美一级大胆视频 | 久久久2o19精品 | 一本久久精品一区二区 | 国产精品成人嫩草影院 | 亚洲三级中文字幕 | 日本黄在线观看 | 在线播放欧美日韩 | 午夜影院视频 | 国产人成在线观看 | 麻豆传媒在线看 | 午夜精品久久久久99热蜜桃导演 | 色老头XXXX| 911免费国产自产在线观看 | 国产片性视频免费播放 | 夜夜操免费视频 | 亚洲xxxx蛇 | 国产莉萝无码AV在线播放 | 亚洲国产欧美日韩在线精品一区 | 欧美精品无码一区二区三区 | 国产成人无码A在线观看不卡 | 成人欧美一区二区三区视频不卡 | 视频在线观看网站 | 青青青视频香蕉在线观看视频 | 国产亚洲午夜 | 精品无码国产日韩制服丝袜 | 久久高清毛片 | 亚洲精品久久久久不卡激情文学 | 精品国产乱码久久久久久郑州公司 | 精品人妻无码一区二区三区蜜桃 | 俺来俺去www|