Sialon,silicon nitride,alumina and silicon carbide are known as engineering ceramics. Among them, silicon nitride has the highest thermal shock resistance. Thus, it makes handling and preheating control easier.
- Low wettability against molten aluminum makes material adhesion on tube less and it makes daily maintenance easier.
- Superior corrosion resistance does not allow eluted contamination into molten metal. This is a key factor to maintain purity of molten alloys.
- Silicon nitride is a dense material and maintains its high mechanical strength even at elevated temperatures. Compared to reaction bonded materials, it assures trouble free operation. In fact, practical accomplishment shows more than 1 year in use.