Use of silicon nitride in the metalworking industry

Because of the combination of high strength values, low coefficient of thermal expansion, and a relatively small modulus of elasticity, Si₃N₄ ceramic is particularly suited to thermal shock-stressed cutting tools such as indexable inserts. One application in which this combination of properties has proven particularly useful is machining cast iron materials – such as cast iron or grey cast iron – with high-performance ceramic cutting tools. In contrast to carbide metals or other cutting materials, when using ceramic indexable inserts, the machining processes can be carried out at the highest speed – even without coolants or lubricants. Excellent high-temperature properties combined with a high degree of resistance to corrosion and strong acids (e.g., sulfuric acid, hydrochloric acid, hydrogen fluoride, alkalis) make Si₃N₄ ceramic the ideal material for, in particular, high-temperature applications in chemical process engineering and mechanical engineering – mainly where extreme temperature changes occur. Components for rollers and draw rings made of silicon nitride are used in metal forming because they can offer a noticeably longer service life than the steel or carbide metal rollers that are usually used. Furthermore, the rolling cycle time is shortened, and work hardening on the rolled metal is facilitated. For example, forming rollers made of Si₃N₄ for rolling heat-resistant metal alloys impress with a service life that’s twice that of forming conventional metal materials. Such tools can also be reground up to three times. Forming and stamping tools made of silicon nitride subject to high mechanical loads have good chemical resistance and long service life. If you are looking for high quality, high purity and cost-effective Silicon Nitride, or if you require the latest price of Silicon Nitride, please feel free to email contact mis-asia.

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