piezoelectric Zirconia Ceramic Ring annulus donut torus
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Zirocnia Ceramics:
ZrO2 has three crystal types under normal pressure and is a polycrystalline phase oxide. The stable crystal structure of ZrO2 from low temperature to high temperature is a low-temperature monoclinic phase crystal structure, a medium-temperature tetragonal phase crystal structure and a high-temperature cubic crystal phase crystal structure. The chemical compositions of the three crystal structures are the same, but their morphology and temperature exist. It is related to pressure. Figure 1 is a schematic diagram of the relationship between three forms of ZrO2. At low temperatures zirconium ions tend to form structures with a coordination number less than 8, ie, monoclinic phases. The cubic and tetragonal phases with the Zr-O octagonal structure can only be stabilized at high temperatures by means of the vibration balance of the crystal lattice. Table 1 also shows the lattice constants and densities of different ZrO2 forms. The t→m phase occurring during the sintering of pure ZrO2 becomes a non-diffusion phase transition, accompanied by a volume expansion of about 7% and a considerable shear strain (about 8%); on the contrary, when heated, from m→t phase Change, volume shrinks. Since t-ZrO2 belongs to the high temperature stable phase, the phase transition of t-ZrO2→m-ZrO2 occurs spontaneously during the sintering of ceramic products. At present, the scheme for retaining t-ZrO2 to room temperature is: 1 reducing the particle size of ZrO2, and the critical size of t-ZrO2 is about 30 nm at room temperature; 2 introducing an oxide capable of forming a solid solution with ZrO2, such as Y2O3, MgO, CaO or some rare earth. Oxide, etc.
Data Sheet↓
Color: Customized Density: 6.0g/cm3 Zirconia Content: 94.4% Gas permeability: 0 Water Absorption: 0 Crystal Size: 0.5um Rockwell Hardness(45N): 78R45N Vickers Hardness (Load 500g): 11.5(1175)Gpa(Kg/mm²) Flexural Strength(20°C): 800Mpa Compressive Strength(20°C): 2000Mpa
Modulus of Elasticity(20°C): ＞200Gpa
Fracture Toughness(20°C): 9.0 MPam1/2 Thermal Conductivity(20°C-400°C): 2.5W(m.K) Thermal Expansion Coefficient: 9.6 10-6/°C Thermal Shock Resistance: 250 △T°C
Application industry:
Machinery, fiber optic, knife, medical, food, petroleum etc.
Specific application:
plunger, Ceramic Shaft, fiber optic bushing, stub, grinding, ceramic knife, ceramic slide guide, machined plunger, mobile phone shell, watch case, haircut razor blade etc.
Why Choose Us? 1.12 years of professional production industrial ceramics factory 2.High quality products with low price 3.High precision parts with lowest tolerance 4.Short time for production 5.Has a group of experienced, professional and efficient R&D team 6.Has a good reputation in China and abroad. 7.MOQ is not limited, small quantity is welcome.
8.Vigorous team and good after-sales service
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