Mechanical behavior of cellular borosilicate glass with pressurized Ar-filled closed pores

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• 作者：Bo Wang^a ; ^b ; ^{xiaoboking@gmail.com} ; Koji Matsumaru^a ; Jianfeng Yang^b ; Zhengyi Fu^c ; Kozo Ishizaki^a
• 关键词：Non-metallic glasses (silicates) ; Hot isostatic pressing (HIP) ; Cellular growth ; Scanning electron microscopy (SEM) ; Compression test
• 刊名：Acta Materialia
• 出版年：2012
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：June, 2012
• 卷：60
• 期：10
• 页码：4185-4193
• 文件大小：1300 K

摘要

High strength borosilicate foams were fabricated by melting glass powder under high-pressure argon gas and subsequent heat treatment of the glass bulk at atmospheric pressure. In the first step, borosilicate glass powder was melted at 1100 掳C for 1 h by capsule-free hot isostatic pressing (HIPing) under a high gas pressure of 10-70 MPa. Pressurized Ar-filled spherical pores were introduced into the glass, and argon atoms were dissolved in the glass network structure. The expansion of argon-filled pores and the release of the dissolved Ar gas resulted in the formation of pressurized Ar-filled closed pores by isothermal heat treatment at 800 掳C for 10 min. A high porosity of up to 80%with a bimodal distribution of micro-size cells was obtained for the resultant cellular borosilicate glass. By increasing the total gas pressure from 10 to 70 MPa, the compressive strength and the Young鈥檚 modulus were increased considerably from 15 to 52 MPa and from 4.1 to 12.6 GPa, respectively, which can be substantially attributed to the high collapse stress from the high enclosed gas pressure. The cellular glass with a high porosity showed a large failure strain under uniaxial compression.