???? ???????
???????? ?? ???????
??????? ????? ??????? ???? 1778 ?? ??? ????? ????? ??? ???? ?????? Scheele. ????? Scheele ??? ???? ?? ?????? ?? ??????? ?????? ??????? (??????), ?? ??? ???? Hjelm ?????? 1782 ????? ????? ?????? ?? ???? ????? ???? ????? ?????? ??? ??? ?? ??? ???????.
?1900 ???????. ??????? ????????? ???????? ?????? ????? ????? ???? ?? ?????? ????? ???? ???? ??????? ?damage.It ???? ?? ??????? ???? ?????? ??????? ????? ???? ????????, ???? ?????? ????, ?? ???? ????. ????? ???????? ??? ?????? ????????? ??? ?????? ????? ??? ?????? ????? ???????. ????? ??????? ??????? ???????, ??????? ?? ?????? ????? ????? ?? ????? ????? ????????.????? ?????? ?molybdate ??????? ????? ?? ???? trioxide molybdic ??????? ????? ???? ?????????? ??????.
???????? ?? ???????
??????? ??? ???? ????. ?????? ??????, ??? ???? ???, ???? ???? ??? ?? ??? ???????? ??????? ????? ?????? (2,623 ° C / 4,753 ° F) ?? ?? ????????. ????? ??? ?? ?? ????? ????? ?????? ????? ?????? ?? ?? ????????, ?? ?? ????? ????? ????? ?? ??????? ?????, ?? ????? ???? ???? ????? ???? ???????? ????????? ????.
??????? ?????? ????? ????????? ????? ?? 760 ° C. ???? ????? ?????? ????????? ??, sublimes ???? ?????? ????? ????? ???? ?? ????, ??????? ??? ????? ????? ???? ???. ???? ????? ?????, ?????? ???? ????? ??????? ??? ??? ????? ?? ???? ???????. ??? ?????? ?????? ????? ?? ???, ??????? ??? ????? ????? ?????? ??????? ?????? ?? ?????.
?????? ????? ????? ?? ??????? ??? ??? ?????? ?????? ?? ???? ????????. ????? ???? ???? ?????? ?? ?? 8% ??????? ???? ?????? ????? ?????? ?? ? 300,000 ????? ?????' ??????. ?? ?? ???? ?? ????? ?? ???? ?????????? ??????. ???????? ??????, ??????? ???? ????? ?0.5% ? -8%, ?????? ????????? ??????. ??? ???, ???? ????? ????? ???? ???? ?? 78% ?????? ??????? ???????.
????? ???? ??????? ?? ???? ???????:
Element |
Wt% |
|
Al |
?0.002 |
|
C |
?0.007 |
|
Cr |
?0.0025 |
|
Cu |
?0.002 |
|
Fe |
?0.01 |
|
Ni |
?0.004 |
|
W |
?0.03 |
|
Co |
?0.002 |
|
Mg |
?0.001 |
|
Mn |
?0.001 |
|
O2 |
Medium |
Coarse |
?0.15 |
?0.08 |
|
Mo |
99.95 Minimum excluding gases |
|
?????? ?????? ????????? ?? ???? ???????:
|
Medium* |
Coarse* |
||
Average Particle Size by Fisher Sub-Sieve Sizer |
||||
FSSS as Supplied |
2.0 – 3.5 |
3.5 – 6.0 |
||
Porosity as Supplied |
>0.60 |
>0.60 |
||
Scott Density g/In3 |
12 – 25 |
15 – 30 |
||
Tap Density g/cc |
1.9 – 3.5 |
2.0 – 4.0 |
||
Mesh Analysis |
>150 |
0–2% |
>150 |
0–2% |
<150 |
98% Min |
<150 |
98% Min |
|
?? ?? ?? ????? ????? ???????, ?? ???? ????? ????? ????"? ?????:sales@chinatungsten.com ?? ??????:+86 592 5129696.
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