Page 268 - UNION

part. memo
E propertIes of fIne CeramICs

Materials Al2O3 ZrO2
tech-
nical Properties Grade sYAL 995 sYAL 950 sYZR-1 sYZR-2
Data density(g/cm3) 3.94 3.77 6.10 5.45
hardness(kg/mm2) 1,800 1,400 1,250 1,500
toughness(mpa· ) 3.0 2.0 7.0 5.5
bending strength(mpa) 500 380 1,300 2,000
young’s modulus(106kg/cm2) 3.8 3.3 2.0 2.5
specific heat(cal/g·℃) 0.19 0.19 - -
thermal expansion Coeff.(×10-6/℃) 7.5 8.0 9.5 8.7
thermal shock(∆t, ℃) 250 200 280 400
thermal Conductivity(ω/mk) 23 23 3.0 7.0
working temperature(℃) 1,600 1,500 800 1,000
Corrosion acid Excellent Good Good Good
resistance alkali Excellent Good Good Good
Wear resistance
Anti-corrosion Wear resistance High strength High strength
merit High temp. Anti-corrosion Wear resistance Wear resistance
application High temp. High toughness High toughness
High purity application Insulation for heat Insulation for heat

Materials si3N4 siC
Properties Grade sYsN-1 sYsN-2 sYsN-3 sYsC-1

density(g/cm3) 3.24 3.26 3.32 3.20
hardness(kg/mm2) 1,500 1,600 1,500 2,800
toughness(mpa· ) 5.0 6.0 4.9 2.5
bending strength(mpa) 800 1,000 900 500
young’s modulus(106kg/cm2) 3.0 3.2 3.0 4.0
specific heat(cal/g·℃) 0.19 0.19 0.19 0.16
thermal expansion Coeff.(×10-6/℃) 2.8 3.0 2.8 4.2
thermal shock(∆t, ℃) 800 800 800 350
thermal Conductivity(ω/mk) 29 29 40 120
working temperature(℃) 1,200 1,200 1,200 1,400
Corrosion acid Good Good Good Excellent
resistance alkali Good Good Good Excellent

High temp. strength High temp. strength High temp. strength
High thermal shock High temp. strength High thermal shock Wear resistance
merit resistance Wear resistance resistance Anti-corrosion
Wear resistance Anti-corrosion Wear resistance Excellent hardness
Anti-corrosion Anti-corrosion

6 Union Materials cUTTING TOOLs 7