Chemical Resistance of Liquid-Phase-Sintered Materials Based on Si3N4–BN
Source abstract
Abstract
Materials based on Si3N4–BN were obtained by liquid-phase sintering using 20% (by volume) YAG as a sintering agent. Boron nitride powders with hexagonal (h-BN) and turbostratic (t-BN) structure were used to obtain composite materials. Highly amorphous t-BN promotes compaction of the materials with the composition (% by volume) 60 Si3N4 + 20 t-BN + 20 YAG and attainment of the highest physico-mechanical properties: ρ = 2.78 g/cm3; P = 14.5%; Eelas = 92.3 GPa; σb = 161.4 MPa. The chemical resistance of the obtained materials reaches 97.0% and increases in the sequence H2SO4 → HCl → HNO3, which attests intercrystalline corrosion without propagation into the interior of the material. However, the resistance to 48% HF is the lowest because of small cracks in the surface intercrystalline layers and deeper corrosion.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Boron and Carbon Nanomaterials Research
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References (32)
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