Ceramic knives for many housewives is still a novelty. It is useful to know what they are and whether it is worth changing ordinary knives to ceramic ones?
The blades of ceramic knives are made of modern technological material of mineral raw materials – zirconium dioxide (ZrO2). This material is very durable and in terms of hardness it is only slightly inferior to diamond, and its properties are similar to high carbon steels. The wear resistance of the ceramic blade exceeds steel by more than 80 times!
The process of making ceramic knives is complicated and time consuming. To obtain a ceramic blade, the powder of this mineral is first pressed under a pressure of 300 tons per cm2, and then quenched at a temperature of 1600-2000 degrees Celsius. The blades of ceramic knives are made in special furnaces, where in conditions of extremely high temperatures, sintering of zirconium dioxide crystals and the process of product formation take place. It should be noted that the longer the product is kept in the oven, the stronger it will be. As a result of this treatment, the ceramic knife blade becomes extremely durable, approaching hardness to corundum and diamond. But its price will be high!
Black or white ceramics can be used in production, so ceramic knives exist from both materials. It is believed that black ceramics has more wear-resistant qualities, products with the addition of black pigments are kept in furnaces longer, as a result of which they become stronger, but more expensive than analogs made of white ceramics. Black ceramic knives have higher hardness and wear resistance than white ones, and therefore the price is higher.
The quality of ceramic knives of course quite depends on the manufacturer, as not every manufacturer is concerned about the observance of the production process at the proper level. Therefore, ceramic knives of one manufacturer’s company may differ in characteristics from ceramic knives of another brand. Cheap ceramic knives of little-known Chinese manufacturers are made, as a rule, in a few hours in a fully automatic production process, fragile and break quickly, unlike Japanese knives from white and black zirconia ceramics Kyocera and Samura.
A large role in the convenience of practical use is played by the handle of a ceramic knife, its shape, surface and materials of which it is made. Ideally, the handle should have an ergonomic shape, the most comfortable, durable and slightly rough surface and light weight. Many manufacturers make the handle of rubberized plastic to facilitate operation and improve the safety of the user. A product with such a handle will not slip from your hands.
For example, Samura ceramic knives have an ergonomic handle made of ABS plastic, covered with heat-resistant rubber, which prevents the knife from slipping out of the hand. Modern design of the knife is also important, because of the many models, the user chooses, as a rule, one, unless of course he acquires a set, but the sets are different.