Analysis of the brazing joints of tubular zirconia ceramics and 06Cr19Ni10 stainless steel tubes

ABSTRACT

The gas-tight joining between yttrium-stabilised semi-closed zirconia ceramic tube and 06Cr19Ni10 stainless steel tube was achieved by using a self-made Ag–27Cu–4Ti paste filler material, where the joint form was an outer sleeve joint. After brazing, the samples were subjected to thermal shock (−50°C to 150°C) and thermal cycling tests (room temperature to 600°C), respectively. The sealing tightness of samples with different assembly clearances was investigated. Microstructure and phase composition of the joint with good performance was analysed. The results showed that the sealing performance of samples with the clearances of 0.03∼0.04 mm was best, and their tightness could still be less than 5 × 10⁻¹⁰Pa·m³s⁻¹ after a series of heat treatment; microstructure of the joint with good sealing was dense and there were no obvious defects; the joining layer adjacent to ceramic was mainly comprised of three continuous reaction layers, the composition phase of which included Ti₃Cu₃O, TiO and ZrTiO₄.

KEYWORDS:

• Zirconia
• 06Cr19Ni10
• tubes
• Ag–27Cu–4Ti
• gas-tight joining

Acknowledgements

The authors would like to express the gratitude to the financial support from the National Natural Science Foundation of China (No.51972320) and Sichuan Province Science and Technology Support Program (CN) (NO.RZ1900002759).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the financial support from the National Natural Science Foundation of China: [Grant Number 51972320]; Sichuan Province Science and Technology Support Program: [Grant Number RZ1900002759].