The ceramic knife appeared to be popular with consumers since ordinary kitchen knife and general metal tool are not enough to meet people’s need. The ceramic knife is known as “noble knife”, which has the advantages that ordinary steel knives cannot match, such as sharpness, safety, environmental protection, fashion, and health.
Ceramic knives were first developed by the Japanese in 1997-1998. Most of the ceramic knives in the market are made of a nano-material named “zirconium oxide“. With zirconia and alumina powder under the high temperature of 2000 ℃, the pressure of 300 tons was pressed into the mold, and then the tool was polished with diamond to make the finished ceramic knife. The ceramic knife is a new type of knife made of nano-technology which is more than ten times as sharp as a steel knife. Therefore, ceramic knives have the characteristics of high hardness, high density, high-temperature resistance, magnetization, and oxidation resistance.
The Mohs hardness of ceramic knife is 9, which is second only to the hardest substance in the world–the diamond (Mohs hardness is 10). As long as we don’t throw it on the ground, hit or chop it, we don’t need to grind it forever. But ceramic knives are not suitable for food that needs to be chopped, such as hard ingredients like thick fish bones and frozen meat. Other non-hard foods such as green vegetables, fruit pulp, sashimi, bamboo shoots (no shell), meat, seafood, shell-free shellfish, etc. can be dealt with ceramic knives.
A product has its advantages and disadvantages, so does a ceramic knife. Because ceramic knives are made of zirconia, the properties of its raw materials determine its hardness of 9. The ceramic knife is very brittle, the toughness of which is low and cannot be cut hard ingredients, and it is easy to collapse when falling from the height. Therefore, ceramic knives cannot be used for cutting, smashing, prying, picking, etc.
In spite of the continuous study in product technology in recent years, there has been the improvement in this aspect, which cannot fundamentally solve the original nature of this product. In addition, the ceramic knife is made into a knife with a large diamond wheel in the process, and the thickness of which becomes thinner; besides, the ceramic knife is loaded with a handle and the weight increases, which reduced the ability of crash-proof.
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