?? ??? ???? ?????? ???????? ??? ??????? ?????????????? ?????????? ??????????, ???? ?????????? (?????????????? ?????????? ??????????) ?????? ?????? ????? ?????????????? ?????????? ???? ???? ??? ?? ???????? ?????? ?????? ?????? ???? ????

1. ???? cast????

(???? cast???? ?????????????? ????????? ????? ??????????)

(1) ??????:

???????? ????? ????????? ?????? ????????? ??????? ??????? ???????? ??????????? ?????? ?????? ???? ???? ??? ??????????????? ??????? ?????????? ???? ?????

(2) ????:

??????? ???????? ??????????? ????????????? ??????? ??? ?????? ???????? ??? ???? ??? ??? ???? ?????? ??? ????????? ??????????? ????????? ??? ??????? ?????? ?????? ??????? ???? ???? ????

(3) ing????:

???? ???????????????? ???? ??? ????????? cast???????? ??????????? ???? ????? ??????? ????????? ??????? ??????? ?????????????? ??????? ???????? ???? ?????? ????

2. ??????????:

?????????? ???????? ????? ?????? F ???????, ???????? ???? ??????? ???? ????????, ???? ???? ???? ????, ????????????? ??????? ??? ??? ????? ??????? cast???? ????? ???????????? ?????? ???? ????

?????????? ??????? 60?63? ????????? ???? ???? ???? ?????????? ??? ??? ???????? ??????? ???? ???? ???? ??????? ???????? ?????????? ????? ????????? ??? ??? different ??????? ??????? ???-????????????? ???????? ??? ????????? ?????????? ??????

3. ??

(????? ???? ???? ???? ???????? ??? ???), ????????? ?????????????? ?????? ????????, ?? ??????? ???? ???????? ????????? ???, ???????????????? ???? ???????? ?????? ???????, ?????????? ??? ?????? ??????? ???????? ???????? ???? ??????? ????????? ???? ??????????? ??? ????

??? ???????????? ????????:

(1) ?????? pretreatment:

???????? ?? ?? ??????? ??????? ????? ????? ???? ???? ?????????? ??????? ???????? ???? ???? ????????? ?? ??????? ?????? ??????? ??? ??? M ???? ?? ????? ?????????? ????????????? ?????? ???? ?????

(2) ????????? ????:

????? ????? pretreatment ???, ???? ??????????? ??????? ?????, ????????? ???? ???? ???? ??????? ??? ???, ??? ??? ???? ??, ????? ??? ????????? ???? AL2O3 ????? ???? ????

(3) ??? ?????:

????????? ?????? ??? ???? ???? ??????? ??????? ????????? ????????-???????, ????????-???? ??? ??????? ??????? ???????? ?????? ??????? ???? ??? ?????? ??????? x????????? ????? ??????? ??? ??????, ????????? ??? ???? ??????? ????????? ?????? ???????, ????? ??? ???? ???? ????? ???? ????????, ???????? ?????????? ????????? (????? ????) ??????? ???? ??? ???? ?????? ?????? ????, ????: ????, ???????, ????? ??? ????????? ??????? ???