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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (5): 1685-1691.

Special Issue: 玻璃

• Glass • Previous Articles     Next Articles

Effect of B2O3 on Structure and Properties of Low Expansion Borosilicate Glass

ZHANG Pan1,2, ZHANG Qinyu1, JIANG Hong1,2, MA Yanping2   

  1. 1. College of Materials Science and Engineering, Hainan University, Haikou 570228, China;
    2. Hainan Key Laboratory of Special Glass, State Key Laboratory of South China Sea Resources Utilization, Hainan University, Haikou 570228, China
  • Received:2020-12-29 Revised:2021-03-05 Online:2021-05-15 Published:2021-06-07

Abstract: The low expansion borosilicate glass was prepared by using Na2O-B2O3-SiO2 low expansion glass system and gradually replacing SiO2 with B2O3 by high temperature melting method. The microstructure of borosilicate glass was analyzed by infrared spectrum and scanning electron microscopy. The content of bridged oxygen and non-bridged oxygen was analyzed by X-ray photoelectron spectroscopy. The effects of the content of B2O3 on the mechanical properties, thermal expansion properties and UV-Vis transmittance of borosilicate glass were studied. The results show that [BO3] in glass structure increases with the increase of B2O3 content, and the phase separation of glass becomes more and more serious. The glass system has good mechanical properties, with microhardness up to 802 kg/mm2 and flexural strength up to 147 MPa. The transition temperature and softening temperature decreased gradually, and the thermal expansion coefficient increased gradually. The visible light transmittance of the glass sample is about 90% without an obvious rule. The increase of [BO3] increases the content of non-bridged oxygen in the glass structure, and the UV-vis transmittance of the glass decreases gradually.

Key words: B2O3, UV-Vis transmittance, low expansion glass, thermal expansion property, mechanical property

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