D Jianxin et al. Materials Science and Engineering A 444(2007)120-129 rnm (a Fig 13. Entry bore profile of the nozzles: (a)entry bore profile of the nozzle before operation. (b)entry bore profile of GN-2 laminated nozzle after 540 min operatic (c)entry bore profile of GN-3 laminated nozzle after 540 min operation, and(d) entry bore profile of CN-2 stress-free nozzle after 540 min operation. Entry 。[ Fig. 14. Photos of the won inner bore profile of the whole ceramic nozzle in longitudinal direction after 540 min operation:(a)GN-2 laminated nozzle, (b)GN-3 laminated nozzle, and(c)CN-2 stress-free nozzle. 一cN2 stressfree noz -GN-2 laminate 6=c OcN-2 stress-free nozzle GN-2 laminated nozzle GN-3 laminated nozzle 0120240360480 Erosion time(min) Fig. 15. Nozzle entry bore diameter variation with the erosion time for GN-2, Fig. 16. Comparison of the erosion rates of different ceramic nozzles in sand GN-3 laminated nozzle and CN-2 stress-free nozzle in sand blasting processes. blasting processes.D. Jianxin et al. / Materials Science and Engineering A 444 (2007) 120–129 127 Fig. 13. Entry bore profile of the nozzles: (a) entry bore profile of the nozzle before operation, (b) entry bore profile of GN-2 laminated nozzle after 540 min operation, (c) entry bore profile of GN-3 laminated nozzle after 540 min operation, and (d) entry bore profile of CN-2 stress-free nozzle after 540 min operation. Fig. 14. Photos of the worn inner bore profile of the whole ceramic nozzle in longitudinal direction after 540 min operation: (a) GN-2 laminated nozzle, (b) GN-3 laminated nozzle, and (c) CN-2 stress-free nozzle. Fig. 15. Nozzle entry bore diameter variation with the erosion time for GN-2, GN-3 laminated nozzle and CN-2 stress-free nozzle in sand blasting processes. Fig. 16. Comparison of the erosion rates of different ceramic nozzles in sand blasting processes