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