An answer that may be inexpensive than tantalum for repairing glass all over nozzles is the usage of a repair sleeve manufactured from PTFE. On this strategy, titanium putty could be used to fill the broken area. Then, a layer of cement is included, plus the PTFE sleeve is installed https://silicon-carbide-support-r14589.pointblog.net/not-known-facts-about-glass-lined-reactor-mechanical-seal-70201821