60results about How to "Dense crystal structure" patented technology

The invention discloses a preparation method of a high-hardness Cu-SiC nanometer compound plating layer and a special device thereof. The preparation method comprises the following steps of: pretreating nanometer SiC particles, preparing an electrolytic solution containing the nanometer SiC particles, primarily treating a cathode plate and carrying out electrolytic deposition for preparing the high hardness Cu-SiC nanometer compound plating layer. In the preparation method of a high-hardness Cu-SiC nanometer compound plating layer, secondary reunion of the nanometer particles can be effectively avoided, the electrolytic solution spray deposition process can be higher than the cathode current density of the common electrodeposition processes for carrying out electrolytic deposition, and therefore, high speed electrolytic deposition on unit area of the cathode surface can be realized. The nanometer composite plate prepared by the invention has the advantages of high content of nanometerparticles, uniform distribution of nanometer particles, high hardness, compact crystal structure, good surface quality, and the like.

The invention relates to an improvement method for a centrifugal casting silicon tube. The improvement method for the centrifugal casting silicon tube comprises the steps of (1) constructing a centrifugal casting device comprising a motor, a coupler, a stainless steel precise tube for casting and molding and a bearing; (2) preparing a mold release, immersing granulous gelatin with certain quantity in purified water for 5 hours, putting a container for containing the gelatin into a water bath after the gelatin fully absorbs moisture and expands, and heating until the gelatin is dissolved completely; (3) pouring the mold release; (4) preparing an RTV (room temperature vulcanization) silicon solution; (5) pouring and curing the silicon solution, namely, pouring a certain amount of silicon mixed solution after volume defoaming into the stainless steel precise tube, and under room temperature, driving the stainless steel tube by the high-speed rotation of the motor until the mixed solution is cured; and (6) demolding, and taking out the molded silicon tube after the cured gelatin is dissolved at the temperature of 35 DEG C. According to the invention, the problem of demolding of silicon tube machining is solved well, and the required silicon tube is manufactured effectively.

The invention relates to a multi-stage magnetic field straight pipe magnetic filtration and pulsed bias compounded electrical arc ion plating method, and belongs to the technical field of material surface treatments. In the prior art, plasma transmission efficiency is low and pulsed bias can not completely remove large particles due to applying of magnetic filtration on an arc source. A purpose of the present invention is to solve problems in the prior art. The method comprises: 1, connecting a workpiece to a pulsed bias power supply, connecting an electrical arc ion plating target source to a target power supply, and connecting a multi-stage magnetic field straight pipe magnetic filtration device in front of the target source; 2, carrying out thin film deposition, wherein work gas is introduced until achieving 0.01-10 Pa when a pressure in a vacuum chamber is less than 10<-2> Pa, the pulsed bias power supply is opened, a pulsed bias amplitude value, frequency and a duty ratio are adjusted, the target power supply is opened, plasma is generated, the multi-stage magnetic field straight pipe magnetic filtration device is opened, removal of large particles and efficient transmission of the plasma in the magnetic filtration device are achieved, process parameters are adjusted, and a thin film with no large particle defect is rapidly produced; and 3, adopting a single-stage magnetic field to combine direct current / pulsed bias to obtain a thin film with a certain thickness.

The invention discloses a metal-type process of a casting blank for a refrigerator inner liner mold on the basis of V-process casting, and relates to a new process adopting a vacuum casting process as the basis and combing the characteristics of marketing products. The metal-type process aims at solving the problems that the finished-product rate of the mold of the inner liner cast by using a sand mold is low, and various casting defects, such as needle holes and shrinkage, are easy to generate on the surface of the mold; simultaneously, the problems of large difficulty of process design in designing and manufacturing all-metal type, high mold-manufacturing cost and difficulty in producing large casting pieces are avoided.