High Temperature Tensile Property of Domestic 550-grade Continuous Alumina Ceramic Fiber

doi:10.15541/jim20210443

Abstract

Abstract:

Oxide fiber has good thermostability and oxidation resistance at high temperature, is one of the important candidates for the reinforcements of composites for aerospace field. The tensile property at high temperature is one of the critical properties of oxide fiber used in harsh environment, but the related research about domestic 550-grade fiber is rarely reported. Here the tensile property of domestic 550-grade continuous alumina fiber at high temperature and its room temperature tensile property after heat treatment were studied. Relationships between the tensile strength and the phase transition, the microstructures, as well as their internal mechanism were investegated. The results showed that the fiber multifilament and filaments had relatively high tensile strength with strength retention rate up to 1100 ℃. The poor thermostability of amorphous SiO₂ had obviously adverse effect on the tensile property of the fiber at temperature above 1200 ℃. Importantly, at the critical phase transition temperature (1300 ℃) mullite plase was formed, which could improve the fiber tensile strength at 1250-1400 ℃. This work demonstrated that the tensile strength of SIC550 fiber at 1100 ℃ was close to that of Nextel 720 and CeraFib by considering the effect of different gauge length.

Key words: alumina, ceramic fiber, high temperature tensile property, mullite

CLC Number:

TQ174

WANG Xingang, YANG Qingqing, LIN Genlian, GAO Wei, QIN Fulin, LI Rongzhen, KANG Zhuang, WANG Xiaofei, JIANG Danyu, YAN Jina. High Temperature Tensile Property of Domestic 550-grade Continuous Alumina Ceramic Fiber[J]. Journal of Inorganic Materials, 2022, 37(6): 629-635.

Figures/Tables 9

Fig. 1 XRD patterns of as-received fibers and fibers after heat-treatment between 600-1400 ℃

Fig. 2 SEM images of as-received fiber (a) and fibers after heat-treatment at (b) 1200, (c)1300, (d) 1400 ℃

Fig. 3 TEM images of SIC550 fiber after heat-treatment at 1300 ℃ for 1 h (a) Bright field image (inset showing the corresponding SAED pattern), and (b) high-resolution image

Fig. 4 Room temperature tensile strength (a) and strength retention rate (b) of SIC550 fiber after heat-treatment at different temperatures in contrast to that of ALF2220S fiber reported by Jiang et al.[14]

Fig. 5 High temperature tensile strength of as-received SIC550 multifilament and high temperature tensile strength of SIC550 multifilament after heat-treatment at 1300 ℃ for 15 min

Fig. 6 XRD patterns of the fracture aeras of SIC550 fibers after tensile strength test at 1250 ℃ (a) and 1300 ℃ (b), and of SIC550 fibers after heat-treatment at 1300 ℃ for 15 min (c)

Fig. 7 TEM images for the fracture areas of SIC550 fibers after tensile strength test at 1250 ℃ (a,c,e), and for SIC550 fiber after heat-treatment at 1200 ℃ for 1 h (b,d,f) Bright field images (a, b) with insets in (a or b) showing the correpongding SAD patterns; Dark field images (c, d), and high-resolution images (e, f)

Fig. 8 High temperature tensile strength (a) and strength retention rate (b) for SIC550 filaments at different temperatures, in contrast to Nextel 720 filaments and CeraFib filaments reported by Almeida et al.[4]

Fig. 9 Room temperature tensile strength of SIC550 filaments at different gauge lengths

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