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Wear resistance materials
|
Unit |
Al₂O₃(KD960) |
Al₂O₃(KD995) |
ZrO₂(KD940) |
Specific Gravity |
g/cc |
3.7 |
3.9 |
6.1 |
Hardness Rockwell |
HRA |
78.0 |
83.0 |
80.0 |
Toughness |
MN/m-3/2 |
2.0 |
3.0 |
8.0 |
Flexural strength |
(25℃) kg/㎠ |
3,100 |
3,800 |
13,000 |
coefficient of thermal expansion |
×10-6/℃ |
8.2 |
8.3 |
9.5 |
Thermal shock |
ΔT,℃ |
200.0 |
250.0 |
290.0 |
Thermal conductivity |
w/mk |
22.0 |
23.0 |
30.0 |
Working temperature |
℃ |
1,500 |
1,600 |
800 |
Young`s modulus |
106kg/㎠ |
3.3 |
3.8 |
2.0 |
|
Unit |
Reaction-bonded Sillcon carbide |
Pressureless-sintered Sillcon carbide |
Density |
g/㎤ |
3.02 |
3.00 |
Hardness (knoop) |
kg/㎟ |
1700 |
2800 |
Compressive trenght |
MPaX103lb/in2 |
>3900 |
>3900 |
Flexural strengh 4pt |
MPaX103lb/in2 |
>350 |
>450 |
Free-si content |
% |
8~12 |
<0.3 |
purity (SiC Content) |
% |
>88 |
>99 |
Modulus of elasticity |
GPax1062 |
4.12×105 |
4.30×105 |
Poisson ratio |
|
0.15 |
0.15 |
Max service temp air |
℃ |
4.3×10-6 |
4.3×10-6 |
Coefficient of thermal expansion RT to 700℃ |
I/℃ |
1500 |
1600 |
|
Unit |
Tungsten carbide |
Density |
g/㎤ |
15.0 |
Hardness Rockwell |
HRA |
92.0 |
TRS |
N/㎟ |
2,590 |
Young`s modulus |
kg/㎟ |
62,000 |
Compressive Strenght |
kg/㎟ |
530.0 |
Thermal Exp.coeff |
x10-6/℃ |
5.0 |
Thermal conductivity |
cal/cm℃sec |
0.19 |