Adhesion between ceramic roller coating and substrate is also one of the important properties of ceramic roller coating. The interaction between coating and substrate can be divided into physical adsorption and chemical adsorption. The force of physical adhesion is the van der Waals force. Each atom or molecule is an independent unit. Due to the interaction of adjacent atoms or molecules, the charge displacement can be caused to form a dipole. The electrostatic attraction generated by the dipole is a very weak interaction, and its binding energy is about 0.4eV below. If the adhesion energy is above 0.4eV, it is a chemical interaction, which includes the covalent combination of two adjacent atoms that exchange electron pairs, the combination of two types of atoms that lose electrons and get electrons, the formation of electrostatic attraction of ion bonding, and the contribution of all atoms to a certain number of electrons to form the metal bonding of shared electrons. All phenomena of adhesion are essentially based on the interaction of electrons between atoms.
The ceramic roller coating can organically combine the strength and toughness, ease of processing, conductivity and thermal conductivity of metal materials with the high temperature resistance, high wear resistance and high corrosion resistance of ceramic materials, give full play to the comprehensive advantages of the two types of materials, and meet the needs of products for structural performance (strength and toughness, etc.), environmental performance (wear resistance, corrosion resistance, high temperature resistance, etc.) or special functions (infrared radiation, wavelength absorption, heat sensitivity, light sensitivity, etc.), The ideal composite structure is obtained.
The thickness of ceramic roller coating can be well controlled. Some are only a few microns to tens of microns thick, suitable for short, small, light and thin articles, such as various sensors, solid state fuel cells, etc; The thick ones are usually a few tenths of a millimeter to several millimeters, up to 20mm, and can be used for heavy and large products, such as large furnace rolls for metallurgical industry, weighing dozens of tons. The large ceramic coated piston rod of the hydraulic cylinder used for large hydraulic hoists can be 16m long and weigh more than ten tons.
