Impeta ifunze y’urudodo rw’icyuma rukomeye, rusizwe hose n’uduce twa diyama cyangwa boron nitride ya kibe twometseho, ruzengurutswa ku muzenguruko warwo bwite kugira ngo rukerereze ikirahure, ibuye n’ibumba ritwitswe mu cyerekezo icyo ari cyo cyose.