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 |