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Properties Comparision of Ceramic Material >>
Bearings
Properties Comparision of Ceramic Material
| Properties | Unit | B4C | Al2O3 | ZTA-20% | ZrO2 | Si3N4 | SiC |
| Density | g/cm³ | 2.4～2.51 | 3.7～3.99 | 5.5 | 6 | 3.2 | 3.2 |
| HV Hardness | Kg/mm | 2700～3200 | 2300～2700 | 1470～1500 | 1300～1500 | 1700～2700 | 2350～2450 |
| Flexural strength | Mpa | 350～400 | 300～400 | 700 | 1000～1500 | 900 | 450～800 |
| Indentation strength | Mpa | 1800～2500 | 2800～3500 | 2000 | 2000 | 3500 | 2250～3000 |
| Impact strength | Mpa.m-3/2 | 6 | 2～4 | 5～6 | 11 | 7 | 4～5 |
| Weber modulus | Gpa | ＞7 | ＞10 | ＞15 | ＞15 | ＞6 | |
| Et Modulus of elasticity | Gpa | 407 | 260 | 210 | 320 | 410 | |
| Poisson ratio | 0.2 | 0.23 | 0.3 | 0.26 | 0.16 | ||
| Coaf. Ofexpansion | x10-6℃ | 4.5 | 6.5～8.6 | 9.4 | 10.5 | 3.2 | 4.3 |
| Heat impact | △T℃ | 200 | 470 | 250 | 500 | 350 | |
| Resistivity | Ω/c㎡ | 0.3～0.8 | ＞104～106 | ＞1010 | ＞1010 | ＞1014 | 100～2 |
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Anti-gorrosion Propertise of ZrO2 ALL-ceramic Bearings
| Molecular formula | Contents % | Temperature | Anti-corrosion property |
| CH3COOH | 80 | boiling | excellent |
| CH3COOH + CH3CO | 50/80 | boiling | excellent |
| H20 + NaCl | boiling | excellent | |
| H2CO3 | boiling | excellent | |
| Cu | 1400℃ | excellent | |
| FoodAcid | boiling | excellent | |
| Fruitjuice | boiling | excellent | |
| HCl | 35 | 25℃ | good |
| HCl + FaCl2 | boiling | good | |
| HF | 25℃ | none resistant | |
| HNO3 | 83 | 25℃ | good |
| HNO3 + HCl | 80 + 20 | boiling | good |
| H3PO4 | 85 | 25℃ | excellent |
| KOH | 25℃ | excellent | |
| NaCO3 + H2SO3 | 18/20 | 925℃ | excellent |
| NaOH | 50 | boiling | excellent |
| H2SO4 | 20 | 25℃ | excellent |
| H2SO4 | 98 | 50℃ | good |
| Al | 100 | 700℃ | excellent |
| Zn | 100 | 500℃ | good |