What are the fixed resistors
Carbon film resistors.
It is made by decomposing hydrocarbons at high temperature in a vacuum to form a conductive film on the surface of the porcelain. It is characterized by wide resistance range, high reliability, small size and low price. But its unit load power is small, and the use environment temperature is low.
Metal film resistors.
Under vacuum conditions, a metal oxide film is deposited on the ceramic surface by evaporation. Its characteristics are wide working range, small temperature coefficient, low noise and small size.
It is made of nickel-chromium alloy, manganese-copper alloy, etc., coated with a heat-resistant glaze layer on its surface. It is characterized by high power, high heat resistance, low noise generated by itself, and good stability. But its volume is large, and the distribution parameters are large.
Metal glass glaze resistors.
This kind of resistor uses metal, metal oxide or refractory compound as the conductive phase, and glass glaze is used as the binder, mixed with the organic binder to form a paste, coated on the ceramic or glass substrate, and then dried, Sintered at high temperature, also known as thick film resistors. Its characteristics are high temperature resistance, high pressure, wide resistance range, small temperature coefficient, stability and reliability, and good moisture resistance.
This kind of resistor is coated with a layer of paint containing flame retardant on the surface of the resistor. Its characteristic is that it is not easy to burn.
It is a kind of dual-function element, which has the function of general resistor and the function of overload fusing. There are two commonly used fuse resistors. One is a metal film fuse resistor. A fuse is added to the resistor body. When the rated load is exceeded, the special metal film that constitutes the resistor will quickly be under the action of the fuse. Blow, making the resistor open. Second, when the wirewound fuse resistor exceeds the rated load, the low-temperature alloy beads on the resistor body are melted, causing the phosphor copper wire to bounce off, and the resistor opens. But it can be repaired manually and can still be used.
This kind of resistor is made by winding resistance wire on a ceramic skeleton to form a resistor blank, putting it into a ceramic shell, filling it with an inorganic binder similar to cement, and curing it through dry noise and high temperature. Its characteristics are small size, high power, flame resistance, arc resistance, and moisture resistance.