New Technology of Tungsten Copper Electrode—Microwave Infiltration

Actually, microwave infiltration is one of new methods of tungsten copper electrode machining, which combines microwave sintering with traditional infiltration. It has many advantages, such as selective heating (the coupling ability of material and microwave, the ability of microwave absorption is related to the properties of itself, such as electrical conductivity, magnetic conductivity and dielectric constant, which will get diverse heating properties when the material is different in a given microwave field. ), volume heating (Each portion of the object in the portion of the material is heated after the heat acquired, so that the part of the material temperature rises.), non-thermal effect (It general refers to compared with traditional sintering under the same thermal dynamic conditions has remarkable superiority in physical, such as the active sintering of powder material and atomic diffusion rate.) , and uniform structure of infiltration processing. Therefore, microwave infiltration has higher speed of increasing temperature, shorter sintering time, higher energy utilization ratio and uniform structure or excellent properties of the products. Microwave infiltration of microwave sintering equipment is produced by DC magnetron microwave waveguide by introducing the heating chamber, the sample is placed in the cavity is heated sintering. The sketch of structure of the equipment as follow:

The major technical parameters of microwave sintering furnace includes work area, the highest working temperature, thermometric, methods, the range of infrared detection, the precision of temperature control, the out power of microwave, vacuum limit of furnace, the leaking of microwave. At present, the use of microwave sintering heating chamber includes a resonant and non-resonant two, while the cavity can be subdivided into single-mode and multi-mode resonant cavity resonator. Under the same electromagnetic power, single-mode resonant cavity having a stronger magnetic field strength is more suitable for low heating medium. The multimode resonator having multiple resonant modes, the electromagnetic field distribution is more uniform, the structure is relatively simple, suitable for a variety of heating load, the more it is difficult to accurately analyze the data.