The Silicon Nitride powder, gray, is new material which produces under the specific high temperature and high pressure, the main component of it is Silicon Nitride. It occupies 80% --97.5% of the total Ingredient, The products of different purity and composition can be produced to satisfy user’s need.

        I. Principal Characters

        (1) Fine corrosion and erosion-resistance, thermal shock resistance, wear-resistance; it can be employed under the temperature of 1900 Celsius degrees.
        (2) Fine disintegration resistance, rather stable chemical ingredient and thermal conductivity.
        (3) For containing nitride, this product possesses the properties of little expansion ratio, high thermal conductivity, high degree of firmness, non-contractive when heating up.
        (4) High intensity and durable.
        (5) Under high temperature, an oxide film will develop on the surface, so as to protect inner material from being affected by chemical reactions.

II. Key Properties

        High strength over a wide temperature range
        High fracture toughness
        High hardness
        Outstanding wear resistance, both impingement and frictional modes
        Good thermal shock resistance
        Good interface compatibility
        Good chemical resistance

        III. Typical Uses

        Rotating bearing balls and rollers
        Cutting tools
        Engine moving parts - valves, turbocharger rotors
        Engine wear parts - cam followers, tappet shims
        Turbine blades, vanes, buckets
        Metal tube forming rolls and dies
        Precision shafts and axles in high wear environments

        IV. Other Applications

        The Si3N4 powder is not only late-model refractory material，but also as new-type material in modern industry widely applied to engineering ceramics, electronic industry, spaceflight, aviation and naval ships of martial field, delivery gate of puddle furnace, acid resistance industry and alkali proof industry. For instance：
        (1) Through mingling this product with other materials，it can work effective action of agglomeration activation，corrosion resistance and anti-disintegration，so this product can be used for making highly etching resistant products.
        (2) By mingling this material and other materials， applying it into furnace body or electric cookers can envelop the mouth of blast furnace more stably，and more easily to be exscinded.
        (3) Using this product as azote additive，this products in powder state contains high nitrogen ingredient of high performance，so it can used as a fine azote additive.
        (4) Adding this products into other materials，will greatly improve their agglutination.
        (5) For its fireproofness and other fine properties，it can be applied into all kinds of fire resisting materials.
        (6) This product can also be used as a kind of high performance abrasive materials and durable materials for making grinding tools.

        V. Chemical Properties

        This product usually begins to be oxidized when above 1000 Celsius degrees，simultaneously a oxide film comes into being. The film immediately holds back actions of oxidation. When below 1700 Celsius degrees，its periphery can not gradually be softened to deoxidize：under acid conditions，it is highly corrosion resistant. When less than 500 Celsius degrees, it is highly alkali resistant.