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Aluminum nitride ceramics are compounds composed of aluminum (Al) and nitrogen (N) elements (chemical formula AlN) with a hexagonal wurtzite crystal structure. Its preparation usually adopts powder metallurgy process, and densification is achieved through high temperature sintering (1700-1900°C) and adding sintering aids (such as Y₂O₃). AlN is known for its high thermal conductivity, excellent insulation and chemical stability, and is an important material in the field of advanced ceramics.