Preparation and Properties of Ceramics Composed of Nano-Al2O3 and Polysiloxane-polyborosilicate-TiB2 Modified Polysilborazane as High Temperature Adhesive for SiC Based Ceramics

doi:10.11902/1005.4537.2019.089

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 367-372 DOI: 10.11902/1005.4537.2019.089

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Preparation and Properties of Ceramics Composed of Nano-Al₂O₃ and Polysiloxane-polyborosilicate-TiB₂ Modified Polysilborazane as High Temperature Adhesive for SiC Based Ceramics

WANG Haiwei¹, CHANG Sen²^,³(

), LUAN Xin'gang³, SONG Xuemei², WANG Zhen², LI Yanzhang², CHEN Jianli², ZHANG Jirong², HAN Ming², QIU Dangui²

1. CNNP Xiapu Nuclear Power Co. Ltd. , Xiapu 355100, China
2. China Institute for Radiation Protection, Taiyuan 030006, China
3. Science and Technology on Thermo Structural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, China

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Abstract

In order to improve the thermal stability and adhesion strength of PSO (polysiloxane)-PBSZ (polyborosilicate)-TiB₂ modified PSNB (polysilborazane) (labeled as PPPT), PSNB was modified by Al₂O₃-PSO-PBSZ-TiB₂ (denoted as PPPTA), and it was used for joining SiC ceramic discs. The microstructure and phase composition of the modified adhesive were analyzed by SEM and XRD. The effect of pyrolysis temperature and addition amount of nano-Al₂O₃ on the microstructure and adhesion strength for the bonding pair of SiBCN ceramics were investigated. The strengthening and toughening mechanism of nano-Al₂O₃ to the bonding SiBCN ceramics was revealed. After curing in air at 120 ℃ for 2 h and then pyrolysis in air at 1000 ℃ for 2 h, the room temperature adhesion strength of PPPT and PPPTA is up to 11.23 and 15.91 MPa, respectively, and more importantly, the high temperature (in air at 800 ℃) shear strength reaches 10.4 and 12.1 MPa, respectively. The analysis shows that nano-Al₂O₃ can effectively suppress the volume shrinkage of the adhesive layer and inhibit the volatilization of the glass phase at high temperature, thereby significantly improving the adhesion strength.

Key words: polyborosilazane nano-Al₂O₃ glass high temperature strength

Received: 21 June 2019

ZTFLH:

TQ174

Fund: National Key R&D Program of China(2017YFB0703200);State Key Laboratory of Solidification Processing (NWPU), China(135-QP-2015);Fundamental Research Funds for the Central Universities(3102017zy058)

Corresponding Authors: CHANG Sen E-mail: changsen0869@163.com

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	Haiwei WANG
	Sen CHANG
	Xin'gang LUAN
	Xuemei SONG
	Zhen WANG
	Yanzhang LI
	Jianli CHEN
	Jirong ZHANG
	Ming HAN
	Dangui QIU

Cite this article:

WANG Haiwei, CHANG Sen, LUAN Xin'gang, SONG Xuemei, WANG Zhen, LI Yanzhang, CHEN Jianli, ZHANG Jirong, HAN Ming, QIU Dangui. Preparation and Properties of Ceramics Composed of Nano-Al₂O₃ and Polysiloxane-polyborosilicate-TiB₂ Modified Polysilborazane as High Temperature Adhesive for SiC Based Ceramics. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 367-372.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.089 OR https://www.jcscp.org/EN/Y2020/V40/I4/367

Fig.1 Molecular structures of PSNB (a), PSO (b) and PBSZ (c)^[18]

Fig.2 Adhesion strengths of PPPT and PPPTA at room temperature and 800 ℃

Fig.3 Cross-sectional micrographs of the joints of PPPT and PPPTA after pyrolyzed at 1000 ℃ in air for 2 h

Fig.4 Room temperature fracture morphologies of PPPT (a, b) and PPPTA (c, d) after pyrolysis at 1000 ℃ (a, c) and 1200 ℃ (b, d) in air for 2 h

Fig.5 High temperature fracture morphologies of PPPT (a, b) and PPPTA (c, d) after pyrolysis at 1000 ℃ (a, c) and 1200 ℃ (b, d) in air for 2 h

Fig.6 XRD patterns of the joints of PPPT (a) and PPPTA (b) after pyrolyzed at 1000 and 1200 ℃ in air for 2 h

Fig.7 Schematic illustration of nano-Al₂O₃ reinforced SiBCN ceramic

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