Manufacturing method of graphite heating rod in vacuum furnace

Manufacturing method of graphite heating rod in vacuum furnace

     Vacuum furnace graphite rod is also called vacuum furnace graphite heating rod. In the early days, people turned graphite into carbon, so it is called carbon rod. The raw material of graphite carbon rod is graphite, which is called adhesive molding. It can be made into graphite products of various shapes, including graphite round rod. Due to the characteristics of graphite, it has unique good characteristics such as conductivity, lubrication, high temperature resistance and so on. Therefore, the graphite carbon rod also has excellent conductivity, heat conduction, lubrication, high temperature resistance and other properties. The future condition is that the properties of graphite are not changed. Therefore, the production and supply of graphite rods are different, and the functional characteristics of graphite rods produced will be different. So how to distinguish? The formed graphite products are either directly made of graphite powder and adhesive, or first made into large square materials, which are processed by the machine according to the drawing or product shape.
     There are great differences and characteristics between the graphite round rod made by the first method and the graphite round rod made by the second method. Due to insufficient pressure during extrusion, the extruded graphite rod with graphite powder and adhesive will be very soft, with poor density and large air tightness (large pores). Dust will fall off in natural state, and it will disperse when soaked with alcohol. At the same time, due to a large amount of adhesive, the conductivity, heat conduction and lubrication of the graphite rod will be greatly reduced, The reason is very simple. Graphite is a conductive material and adhesive is an insulating material, which is bound to greatly reduce the conductivity of graphite rod. The standard name for this graphite carbon rod is carbon arc air gouging carbon rod. It is used for cutting in foundry. The surface needs to be plated with a layer of copper to prevent moisture and conduct electricity. Therefore, this kind of carbon rod also has a feature that the diameter will be less than 0.1-0.2mm marked, because the surface will just reach the marked diameter when it is plated with 10% metal.
     Although the second method is also made of graphite powder and adhesive, there is great emphasis on its process. Firstly, graphite powder and adhesive are used to make large graphite materials under high pressure, and then impregnated by high-temperature roasting (evaporation and volatilization of adhesive). In this way, there is almost no adhesive in graphite after repeated impregnation roasting. This impregnation roasting process is very key. The reduced graphite after impregnation roasting has the characteristics of graphite itself and has all the functions and characteristics of graphite. Because such graphite has higher purity, it is also called high-purity graphite, and the made graphite rod is also called high-purity graphite rod.