70results about How to "Play a warm-up role" patented technology

The invention discloses a lead welding technique for packaging a semiconductor power device and belongs to the technical field of semiconductor power device packaging and manufacturing. According to the technique, lead connection is achieved through a brazing technique, and the brazing process is achieved through lasers, wherein lead connection refers to the completion of the welding process of a lead and a chip and the welding process of the lead and two welding points of a frame. In the welding process, the lead, the frame and a chip welding pad are preheated through direct laser spot radiation, the diameter of laser spots is 1 mm, and laser radiation time is 10 ms; and a brazing wire is heated through direct laser spot radiation, the diameter of the laser spots is 1 mm, and laser radiation time is 10 ms. By the adoption of the technique, the wet aluminum pad and the frame can be melted directly to achieve stable and reliable connection of the lead, the chip and the frame, the aluminum pad and the frame cannot be melted due to the fact that the temperature does not reach the melting point, and the aluminum pad and the frame are just preheated, so that the surfaces are stretched fully to assist in combination of the aluminum pad and liquid brazing filler metal and combination of the frame and the liquid brazing filler metal, and therefore mechanical damage, thermal damage and the stress problem existing in a traditional routing technique are avoided.

The invention belongs to the technical field of high-temperature steam electrolysis for hydrogen production and relates to a bottom entering gas testing device for a planar SOEC (solid oxide electrolyzer cell) stack. The testing device comprises a support base plate, a ceramic support pipe, a buffer gasket, a testing base and four stainless steel gas path pipes, wherein 4 gas flow distribution hole channels are formed in a cuboid of the testing base and communicate four base bottom gas holes with four base top gas holes pairwise. The testing device is used as a testing platform for a high-temperature SOEC stack and has the characteristics of stable testing, practicality, convenience, easiness in assembly, simplicity in operation and the like; the testing device adopts a design mode for combining the ceramic material and the high-temperature-resistant stainless steel material and has the performance of temperature resistance, heat insulation and electric insulation; the gas flow distribution hole channels formed in the testing base adopt inside roundabout design, heat in a high-temperature furnace is used directly for preheating entering gas, and the problems of gas pipe cracking and gas leakage of pipe joints at a high temperature are solved. The testing device is applicable to stable operation and performance testing of the SOEC stack.

The invention discloses a fresh rice bran pretreatment process and a matched device thereof, belonging to the field of oil pretreatment. The process comprises the following steps: (1) performing floury product separation treatment on fresh rice bran so as to obtain purified rice bran of which the fine broken rice content is lower than 1 percent; and (2) collecting the purified rice bran, and performing sterilization, inactivation and forming treatment on the purified rice bran. The matched device comprises a floury product separator, a collecting cyclone separator, a sterilization forming machine and an air heater, wherein an air inlet of the floury product separator is communicated with a hot-air conveying pipeline; the other end of the hot-air conveying pipeline is connected with an air outlet of the air heater; a fresh rice bran inlet is formed in the hot-air conveying pipeline between the air heater and the floury product separator; an upper air outlet of the floury product separator is connected with an air inlet of the collecting cyclone separator through a pipeline; a discharge opening of the collecting cyclone separator is connected with a feeding hole of the sterilization forming machine through a feeding auger. The fresh rice bran is pretreated by utilizing the process and the device provided by the invention, the obtained rice bran is suitable for being stored for more than one month at room temperature, the acid value of leached crude rice bran oil is maintained on a low level, and the storage acid value is slowly raised.