Ceramic tools belong to the noble class, so its performance and characteristics are far beyond other blades, but the application in the industrial industry is more complicated. In order to adapt to heavy cutting loads and harsh working conditions, ceramic tools The material should have the following properties.
1. Hardness and wear resistance
Hardness is the basic performance of ceramic tool materials. The hardness of the ceramic tool should be higher than the hardness of the workpiece material, and the hardness at room temperature must generally be above 60HRC.
Abrasion resistance refers to the ability of a material to resist abrasion, and it is related to the hardness, strength and structure of the material. The higher the hardness of the material, the better the wear resistance; the higher the hardness of the hard spots such as carbides and nitrides in the structure, the smaller the particles, the greater the number and the more uniform the distribution, the higher the wear resistance.
2. Strength and toughness
Ceramic tools must withstand greater cutting force, impact and vibration during cutting. In order to avoid tool collapse and breakage, ceramic tool materials should have sufficient strength and toughness. The strength and toughness of materials are usually expressed in terms of flexural strength and impact value.
3. Heat resistance and heat transfer
Heat resistance: refers to the ability of ceramic tool materials to maintain sufficient hardness, wear resistance, strength and toughness, oxidation resistance, adhesion resistance and diffusion resistance at high temperatures (also known as thermal stability).
Thermal hardness: The ability of a material to maintain high hardness at high temperatures is called thermal hardness (also known as high temperature hardness, red hardness), which is a necessary condition for ceramic tool materials to maintain cutting performance. The higher the high temperature hardness of the tool material, the better the heat resistance and the higher the allowable cutting speed.
The heat transfer coefficient of the blade material is large, which is conducive to transferring the heat from the cutting zone and reducing the cutting temperature.
Fourth, craftsmanship and economy
In order to facilitate the processing and manufacturing of ceramic tools, the blade material must have good process properties, such as hot rolling, forging, welding, heat treatment and mechanical processing.