zirconium diboride mechanical properties
Zirconium carbide (ZrC) powder, batched to a ratio of 0.98 C/Zr, was prepared by carbothermal reduction of ZrO2 with carbon black.
Nominally phase‐pure ZrC powder had a mean particle size of 2.4 μm.
The synthesized powder was hot‐pressed at 2150°C to a relative density of > 95%.
The mean grain size was 2.7 ± 1.4 μm with a maximum observed grain size of 17.5 μm.
The final hot‐pressed billets had a C/Zr ratio of 0.92, and oxygen content of 0.5 wt%, as determined by gas fusion analysis.
The mechanical properties of ZrC0.92O0.03 were measured at room temperature.
Vickers’ hardness decreased from 19.5 GPa at a load of 0.5 kg to 17.0 GPa at a load of 1 kg.
Flexural strength was 362.3 ± 46 MPa, Young's modulus was 397 ± 13 MPa, and fracture toughness was 2.9 ± 0.1 MPa•m1/2.
Analysis of mechanical behavior revealed that the largest ZrC grains were the strength‐limiting flaw in these ceramics.
Zirconium diboride ceramics produced using commercial ZrB2 powders, and milled with zirconium diboride grinding media, were fabricated by hot-pressing at temperatures of 2100–2200 °C with hold times of 30–120 min.
This ZrB2 exhibits no additional impurities typically introduced by milling with grinding media of differing compositions.
Microstructure analysis revealed grain sizes ranging from ~25 to ~50 µm along with ~3 vol% porosity.
Flexure strength ranged from 335 to 400 MPa, an elastic modulus from 490 to 510 GPa, fracture toughness from 2.7 to 3.2 MPa m½, and hardness from 13.0 to 14.4 GPa.
Strength limiting flaws were identified as surface grain pullout induced by machining.
Elastic modulus and hardness were found to increase with decreasing porosity.
Compared to the fine-grained ceramics typically reported, large grain zirconium diboride ceramics exhibit higher than expected room temperature strengths.
zirconium diboride crystal structure
Formula: ZrB2, CAS No.：12045-64-6, the crystal structure of ZrB2 is a hexagonal crystal system that is similar to a metal structure.
Due to this, ZrB2 provides excellent conductivity and migration characteristics.
Furthermore, Zr~B ionic bond between a boron atom and Zr atom and B-B covalent bonds are so strong that ZrB2 has a high melting point, high hardness, and high stability material.
At the same time, it also shows better flame retardancy, heatproof, oxidation resistance, chemical resistance, and neutron absorption capability.
The density is typically 6.085～6.17, melting point at 3,040℃, Rockwell hardness 88-91, and the compressive strength 1,555.3 Gpa.
It is resistant to the etching of Al, Ca, Mg, Si, Pb, and Sn, and the electrical resistivity is 16.6×10-5Ω·cm while the thermal conductivity is 24.27W/m·K.
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