Silicon nitride ceramic article, plate performance characteristic and application situation:because the silicon nitride ceramics have the high temperature mechanical strength to be high, to be wear-resisting, acidproof, alkali corrosion and so on outstanding performance, therefore in the request high temperature, the corrosion resistance, the anti-machinery attrition and so on special project situation like aerospace, the petroleum, the chemical industry and so on uses the silicon nitride ceramic article components to have the important meaning. its can widely be suitable for the electrical machinery, the electric appliance, the machinery, in the machining profession anti-rubs, high strength thermostable, anti-corrosive and so on parts or substitutes the original traditional metal system part.