Polycrystalline fiber nnukwu nwere obere njupụta, ala thermal conductivity, ezigbo thermal ujo na-eguzogide, elu na-arụ ọrụ temp, ezigbo kemịkalụ kwụsie ike, ọma mgbochi corrosion wdg atụmatụ, ọ na-ọtụtụ ebe na metallurgy, ewu, ceramics, aerospace, agha wdg ụlọ ọrụ.