This work was supported by the Project for “Innovative Development of Ceramics Manufacturing Technologies for Energy Saving” from the Ministry of Economy, Trade and Industry (METI), and New Energy and Industrial Technology Development Organization (NEDO).
Joining of Silicon Nitride by Local Heating for Fabrication of Long Ceramic Pipes
Article first published online: 25 OCT 2012
© 2012 The American Ceramic Society
International Journal of Applied Ceramic Technology
Volume 11, Issue 1, pages 164–171, January/February 2014
How to Cite
Hotta, M., Kondo, N., Kita, H., Ohji, T. and Izutsu, Y. (2014), Joining of Silicon Nitride by Local Heating for Fabrication of Long Ceramic Pipes. International Journal of Applied Ceramic Technology, 11: 164–171. doi: 10.1111/j.1744-7402.2012.02853.x
- Issue published online: 2 JAN 2014
- Article first published online: 25 OCT 2012
- Ministry of Economy, Trade and Industry (METI)
- New Energy and Industrial Technology Development Organization (NEDO)
This study demonstrated that a long silicon nitride pipe of several meters with adequately strong joints can be fabricated by a local-heating joining technique. Commercially available silicon nitride ceramic pipes sintered with Y2O3 and Al2O3 additives were used for parent material, and powder slurry of Si3N4-Y2O3-Al2O3-SiO2 system was brush-coated on the rough or uneven end faces of the pipes. Joining was carried out by locally heating the joint region at different temperatures from 1500°C to 1650°C for 1 h with a mechanical pressure of 5 MPa in N2 flow; using a horizontal electrical furnace specially designed for this experiment. The silicon nitride pipe 3-m long was successfully fabricated without voids or cracks in the joint region, and the microstructure of the joint region was similar to that of the parent one. The joint strength was examined in flexure using specimens cut from the joined pipes, and those joined at 1600°C and 1650°C indicated the highest strength of about 680 MPa, which was almost the same as that of the parent material. This study also indicated that the slurry brush-coating technique is advantageous to easily joining ceramic pipes with rough or uneven end faces, which is essentially important for practical use.