| Boron carbide,a
black crystal powder,is one of the hardest Man-Made materials,its
hardness with Mohs hardness 9.36 and micronscopic hardness 5400-6300kg/mm2
is only near upon diamond,its density is 2.52g/cm3 and
melting point at 2450¡æ,the boron carbide possesses properties of
endurance hi/low temperature,no reaction with either acids or alkalis,high
grinding efficency,no magnetism.It is a good replacement of diamond.Boron
carbide also possesses the specialty properties of light quality,neutron
absorbing,semi-conductivity,etc.so it is used for armed forces and
nuclear industry.Boron carbide is widely applied as follows:boriding
refractory,ion transfuse,film layer as well as grinding,polishing,drilling
hard metal alloys,jewels,etc.Meanwhile,it is main material for the
wear-resisting parts,precise meter-resisting parts,precise spray
nozzle,sealed washer,smelting boron steel,boron alloy,etc.Boron
carbide has showed many better properties of physics and chemistry
in the hi-science/technology field. |
Grit
No |
Basic
Grain(um) |
Chemical Component |
Total B |
Total C |
Content B4C |
60# |
250 |
77-80 |
17-21 |
96-98 |
70# |
212 |
80# |
180 |
90# |
150 |
100# |
150 |
120# |
106 |
150# |
90-75 |
180# |
75-63 |
76-79 |
95-97 |
220# |
63-53 |
F230 |
63-53 |
F240 |
63-50 |
F280 |
50-40 |
F320 |
40-28 |
F360 |
28-20 |
F400 |
20-14 |
75-78 |
94-95 |
F500 |
14-10 |
F600 |
10-7 |
F800 |
7-5 |
74-78 |
91-94 |
F1000 |
5-3.5 |
F1200 |
3.5-2.5 |
60#-150# |
250-75 |
76-81 |
93-97 |
46-120# |
350-60 |
-100mesh |
<150 |
-140mesh |
<100 |
-200mesh |
<75 |
-325mesh |
<44 |
-25um |
<25 |
-10um |
<10 |
Item |
Browm
Aluminum Oxide |
White
Aluminum Oxide |
PinkAluminum
Oxide |
Black
Silicon Carbide |
Green
Silicon Carbide |
Basic
mineral |
a-AL2O3 |
a-AL2O3 |
a-AL2O3 |
a-SiC |
a-SiC |
Crystal
System |
Hexagonal |
Hexagonal |
Hexagonal |
Hexagonal |
Hexagonal |
Crystal
Color |
Brown |
White |
Pink |
Black |
Green |
Density |
¡Ý3.90g/cm3 |
¡Ý3.90g/cm3 |
¡Ý3.90g/cm3 |
¡Ý3.12g/cm3 |
¡Ý3.18g/cm3 |
Mohs
Hardness |
9 |
9 |
9 |
9.15 |
9.15 |
Micro
Hardness |
HV1800-2200 |
HV2200-2300 |
HV2200-2300 |
HV3100-3280 |
HV3280-3400 |
Grinding
Ability |
0.10 |
0.12 |
0.12 |
0.25 |
0.28 |
Linear
expansion coefficlent(When 900¡æ.a.10-6k-1) |
7.6 |
8.3 |
8.3 |
4.4 |
4.6 |
Electrical
Resistivity |
1014-1016¦¸.cm |
3¡Á105-3¡Á107¦¸.cm |
| Comparison Chart For Abrasive Nominal Grit Sizes |
| Nominal size range(in:um) |
Grit
No |
China(GB/T2481.1-1998) |
ANSI
B74.12-1992 |
JIS
R6001-1998) |
F4 |
5600-4750 |
5600-4750 |
|
F5 |
4750-4000 |
4750-4000 |
|
F6 |
4000-3350 |
4000-3350 |
|
F7 |
3350-2800 |
3350-2800 |
|
F8 |
2800-2360 |
2800-2360 |
2800-2360 |
F10 |
2360-2000 |
2360-2000 |
2360-2000 |
F12 |
2000-1700 |
2000-1700 |
2000-1700 |
F14 |
1700-1400 |
1700-1400 |
1700-1400 |
F16 |
1400-1180 |
1400-1180 |
1400-1180 |
F20 |
1180-1000 |
1180-1000 |
1180-1000 |
F22 |
1000-850 |
- |
1000-850 |
F24 |
850-710 |
850-710 |
850-710 |
F30 |
710-600 |
710-600 |
710-600 |
F36 |
600-500 |
600-500 |
600-500 |
F40 |
500-425 |
- |
500-425 |
F46 |
425-355 |
425-355 |
425-355 |
F54 |
355-300 |
355-300 |
355-300 |
F60 |
300-250 |
300-250 |
300-250 |
F70 |
250-212 |
250-212 |
250-212 |
F80 |
212-180 |
212-180 |
212-180 |
F90 |
180-150 |
180-150 |
180-150 |
F100 |
150-125 |
150-125 |
150-125 |
F120 |
125-106 |
125-106 |
125-106 |
F150 |
106-75 |
106-75 |
106-75 |
F180 |
90-63 |
90-63 |
90-63 |
F220 |
75-53 |
75-53 |
75-53 |
| Comparison Chart For Abrasive Micropowder Grit Sizes |
China |
JIS
R6001-1998 |
ANSI
B74.12-1992 |
FEPA
42GB-1984 DIN69101-1985 |
GB/T2481.2-1998 |
GB/T9258.1-2000 |
Grit
No |
d50(um) |
Grit
No |
d50(um) |
Grit
No |
d50(um) |
Grit
No |
d50(um) |
Grit
No |
d50(um) |
Sedimentation
tube method |
Electric
resistance method |
Sedimentation
tube method |
Standard
Werte der Mlkro-Frelhe |
Sedigraph
5000D |
|
|
P240 |
58.5¡À2.0 |
240 |
60.0¡À4.0 |
57.0¡À3.0 |
|
|
|
|
|
|
|
P280 |
52.2¡À2.0 |
280 |
52.0¡À3.0 |
48.0¡À3.0 |
|
|
|
|
|
F230 |
53.0¡À3.0 |
P320 |
46.2¡À1.5 |
320 |
46.0¡À2.5 |
40.0¡À2.5 |
240 |
53.5-50 |
F230 |
53.0¡À3.0 |
50.0¡À3.0 |
F240 |
44.5¡À2.0 |
P360 |
40.5¡À1.5 |
360 |
40.0¡À2.0 |
35.0¡À2.0 |
|
|
F240 |
44.5¡À2.0 |
42.0¡À2.0 |
|
|
P400 |
35.0¡À1.5 |
400 |
34.0¡À2.0 |
30.0¡À2.0 |
280 |
44-40.5 |
|
|
|
F280 |
36.5¡À1.5 |
P500 |
30.2¡À1.5 |
500 |
28.0¡À2.0 |
25.0¡À2.0 |
320 |
36-32.5 |
F280 |
36.5¡À1.5 |
34.5¡À1.5 |
F320 |
29.2¡À1.5 |
P600 |
25.8¡À1.0 |
600 |
24.0¡À1.5 |
20.0¡À1.5 |
360 |
28.8-25.8 |
F320 |
29.2¡À1.5 |
27.7¡À1.5 |
F360 |
22.8¡À1.5 |
P800 |
21.8¡À1.0 |
700 |
21.0¡À1.3 |
17.0¡À1.3 |
400 |
23.6-20.6 |
F360 |
22.8¡À1.5 |
21.6¡À1.5 |
F400 |
17.3¡À1.0 |
P1000 |
18.3¡À1.0 |
800 |
18.0¡À1.0 |
14.0¡À1.0 |
500 |
19.7-16.7 |
F400 |
17.3¡À1.0 |
16.5¡À1.0 |
F500 |
12.8¡À1.0 |
P1200 |
15.3¡À1.0 |
1000 |
15.5¡À1.0 |
11.5¡À1.0 |
600 |
16-13 |
F500 |
12.8¡À1.0 |
12.3¡À1.0 |
|
|
P1500 |
12.6¡À1.0 |
1200 |
13.0¡À1.0 |
9.5¡À0.8 |
|
|
|
|
|
F600 |
9.3¡À1.0 |
P2000 |
10.3¡À0.8 |
1500 |
10.5¡À1.0 |
8.0¡À0.6 |
800 |
12.3-9.8 |
F600 |
9.3¡À1.0 |
9.0¡À1.0 |
|
|
P2500 |
8.4¡À0.5 |
2000 |
8.5¡À0.7 |
6.7¡À0.6 |
1000 |
9.3-6.8 |
|
|
|
F800 |
6.5¡À1.0 |
|
|
2500 |
7.0¡À0.7 |
5.5¡À0.5 |
|
|
F800 |
6.5¡À1.0 |
6.3¡À1.0 |
F1000 |
4.5¡À0.8 |
|
|
3000 |
5.7¡À0.5 |
4.0¡À0.5 |
1200 |
6.5-4.5 |
F1000 |
4.5¡À0.8 |
4.5¡À0.8 |
F1200 |
3.0¡À0.5 |
|
|
4000 |
|
3.0¡À0.4 |
|
|
F1200 |
3.0¡À0.5 |
3.1¡À0.5 |
|
|
|
|
6000 |
|
2.0¡À0.4 |
|
|
|
|
|
|
|
|
|
8000 |
|
1.2¡À0.3 |
|
|
|
|
|
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