Ceramic knives are a new type of knife made from nano-grade zirconium oxide, formed under 300-ton high-pressure molds and sintered at 2000℃. Utilizing high-tech nanotechnology combined with precision ceramic high-pressure manufacturing processes, they possess high hardness (Mohs hardness 9), high density, high temperature resistance, anti-magnetization, and oxidation resistance, with a sharpness more than ten times that of metal knives. Because they use zirconium oxide-based materials, ceramic knives are also known as "zirconia gemstone knives," effectively preventing metal residue and bacterial growth, making them suitable for cutting non-hard foods such as fruits, vegetables, and meats. The materials are divided into three categories: alumina-based ceramics, silicon nitride-based ceramics, and composite silicon nitride-alumina-based ceramics, all characterized by being static-free, resistant to acid and alkali corrosion, and having a sharp and easy-cutting edge.
The manufacturing process includes core steps such as mixing nanopowders, high-pressure forming of the blank, sintering, and diamond polishing. The blade body is strengthened through atmosphere-protected sintering and hot isostatic pressing technology to form a durable edge. Some products have added metal powder to enhance strength, making them detectable by metal detectors. The knives come with ABS, wooden, or ceramic handles and should be used with a wooden cutting board to prevent them from falling. Ceramic knife technology, originating in Germany and the UK, has been expanded for civilian use by optimizing the toughness of zirconia-based materials.