2013年11月29日星期五

Carbon Content

The carbon content of a WC powder is commonly stated as total carbon and free carbon (uncombined carbon present as graphite or amorphous carbon). The difference between these values accounts for the combined carbon (chemically bound as carbide).
The total carbon content should be theoretically 6.13 wt% carbon, which means that all carbon is chemically combined as WC. However, in practice, a small amount of uncombined carbon is always present (some hundredths of percent).

The proper total carbon depends on further processing of the powder (compact) and is dictated by the hardmetal producer, due to its processing experience (carburizing, neutral, or decarburizing conditions).

The determination method is described in ISO 3907 and ISO 3908 and should result in standard deviation of no more than +0.01 wt%.

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2013年11月20日星期三

Specification of Tungsten Oxide from National Standard

Specification of tungsten oxide from national standard

Grades
WO3-0
WOX-0
WO3-1
WOX-1
WO3-2
WOX-2







Impurity Content
Max.
Al
0.0005
0.001
0.001
As
0.001
0.001
0.003
Bi
0.0001
0.0001
0.0005
Ca
0.001
0.001
0.003
Co
0.001
0.001
0.002
Cr
0.001
0.001
0.001
Cu
0.0003
0.0005
0.001
Fe
0.001
0.001
0.003
K
0.001
0.0015
0.002
Mg
0.0007
0.001
0.002
Mn
0.001
0.001
0.001
Mo
0.002
0.005
0.02
Na
0.001
0.0015
0.003
Ni
0.0007
0.0007
0.001
P
0.0007
0.001
0.002
Pb
0.0001
0.0001
0.0005
S
0.0007
0.001
0.001
Sb
0.0005
0.001
0.002
Si
0.001
0.001
0.003
Sn
0.0002
0.0005
0.001
Ti
0.001
0.001
0.002
V
0.001
0.001
0.002
WO3 LOI
0.5
0.5
0.5
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Specification of Tungsten Carbide Powder from National Standard

Specification of tungsten carbide powder from national standard
牌号Grades
比表面积/(m2/g)
平均粒度范围(F.S.S.S)
/µm
氧含量(Oxygen)
/%
不大于
总碳(TC)/
%
游离碳(FC)
/%
不大于
化合碳(CC)
/%
不小于
FWC02-04
--
0.35
6.20~6.30
0.20
6.07
FWC04-06
1.5~2.5
--
0.30
6.15~6.25
0.15
6.07
FWC06-08
--
≥0.60~0.80
0.20
6.13~6.23
0.12
6.07
FWC08-10
--
0.8~1.00
0.18
6.08~6.18
0.08
6.07
FWC10-14
--
1.00~1.40
0.15
6.08~6.18
0.06
6.07
FWC14-18
--
1.40~1.80
0.15
6.08~6.18
0.06
6.07
FWC18-24
--
1.80~2.40
0.12
6.08~6.18
0.06
6.07
FWC24-30
--
2.40~3.00
0.10
6.08~6.18
0.06
6.07
FWC30-40
--
3.00~4.00
0.08
6.08~6.18
0.06
6.07
FWC40-50
--
4.00~5.00
0.08
6.08~6.18
0.06
6.07
FWC50-70
--
5.00~7.00
0.05
6.08~6.18
0.06
6.07
FWC70-100
--
7.00~10.00
0.05
6.08~6.18
0.06
6.07
FWC100-140
--
10.00~14.00
0.05
6.08~6.18
0.06
6.07
FWC140-200
--
14.00~20.00
0.05
6.08~6.18
0.06
6.07
FWC200-260
--
20.00~26.00
0.05
6.08~6.18
0.06
6.07
FWC260-350
--
26.00~35.00
0.08
6.08~6.18
0.06
6.07

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Analyses of tungsten powder from national standard

Analyses of tungsten powder from national standard
Grades
FW-1
FW-2
FWP-1







Impurity Content(%)Max
Fe
F.S.S.S< 10um;0.0050
0.030
0.030
F.S.S.S≥10um;0.010
Al
0.0010
0.0040
0.0050
Si
0.0020
0.0050
0.010
Mg
0.0010
0.0040
0.0040
Mn
0.0010
0.0020
0.0040
Ni
0.0030
0.0040
0.0050
As
0.0015
0.0020
0.0020
Pb
0.0001
0.0005
0.0007
Bi
0.0001
0.0005
0.0007
Sn
0.0003
0.0005
0.0007
Sb
0.0010
0.0010
0.0010
Cu
0.0007
0.0010
0.0020
Ca
0.0020
0.0040
0.0040
Mo
0.0050
0.010
0.010
K+Na
0.0030
0.0030
0.0030
P
0.0010
0.0040
0.0040
C
0.0050
0.010
0.010
O
Sheet
0.20

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