?? ????? ?????? ?????????? ????? ????? ?? ?????? ??? ?????????? ????????? ?????. ???????????? ?? ???????????? ?????? ??? ???????????? ?????? ????????????????? ????????????? ??? ?????? ????? ?????. ?? ??????? ?????? ??? ??????? ??????? ????? ????? ????????????? ?????, ??? ??? ???????? ?????? ??? ?????????? ????? ???????????.
?? ???? ????? ??? ??????????? ??? ????????? ????? ???? ???????? ????????????? ??? ????? ???????????????:
(1) ????? ?????????
????????????, ????? ????????? ??? ???????? ?? ?? ????? ???? ??? ????????? ??? ?? ?????? ??????????? ??? ?? ???????????? ?????? ???????????????. ?? ???????? ??????? ???? ??? ??? ????? ????? ?????????, ????? ???? ??? ????? ?????? ????????. ??? ?????????, ?? ??????? ??????? ???? ???? ?? ?????????? ????? ??? ?? ???????? ?? ?????????? ??????? ??? ????? ??????????? ?? ?????? ???????? ??? ?? ??????????.
(2) ???? ??????????? ????????
???? ??? ???? ?? ??? ???? ????? ????????? ??? ?? ???????? ??????? ????. . ????, ??? ???? ??????? ???? ???????? ????????????? ???? ???? ??????? ?? ??????????? ??????????? ????????.
(3) ??? ?? ?????? ?????????????? ????????????
?? ???????? ??????? ???? ??? ????????? ??? ????????? ????? ??? ?? ??????? ???????? ??? ?? ?????? ?????????????? ????????????
(4) ??? ???????????? ???????????
?? ???????? ??????? ???? ??? ????????? ??? ????????? ????? ??? ??? ??? ?? ???????????? ????????????? ??? ?????? ??? ????? ?? ???? ???????????? ??????????.
(5) ?????? ??????? ???????????? ??? ??? ????????
???? ??? ?????? ?? ??????? ???????????????? ??? ????????? ???????? ??????? ???? ??? ??? ????????? ??? ?? ??? ???? ?????????. ?? ???????? ??????? ???? ????? ?????????? ?? ???????????? ??? ????? 1500 ° C, ???? ???? ????????? ????? ????? ?????????? 660 ° C.
?????? ??????????: ????????? ??????, ???????????? ??? ?????? ??????????? ??????????, ???????????? ?????, ?????? ?????, ?????????, ???????, ????????????? ???????????? ??? ??????? ???????, ?????? ??????????? ??? ???????????????? ????????????, ???.