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360 results about "Composite media" patented technology

A preparing method of a ceramic-filled polytetrafluoroethylene microwave composite-medium substrate

ActiveCN107474312ABall milling process is simpleGood modification effectFiltrationThermal expansion
A preparing method of a ceramic-filled polytetrafluoroethylene microwave composite-medium substrate is disclosed. The method includes 1) adding silicon dioxide ceramic powder into a liquid mixture of hydrogen peroxide and concentrated hydrochloric acid after the silicon dioxide ceramic powder is dried, and heating the mixture to 50-70 DEG C to obtain a suspension; 2) subjecting the suspension to suction filtration and drying a product in a vacuum environment; 3) adding the silicon dioxide ceramic powder obtained in the step 2) into a solution mixture of deionized water and absolute alcohol, adjusting the pH value to be 3-5, weighing a coupling agent the weight of which is 1.0-2.5% of the weight of the silicon dioxide ceramic powder, performing ball milling, and fully mixing the mixture to obtain a material mixture; 4) filtering and drying the material mixture to obtain modified silicon dioxide ceramic powder; 5) ball-milling and mixing the modified silicon dioxide powder, chopped glass fibers and polytetrafluoroethylene, and then performing demulsification to obtain dough; and 6) subjecting the dough to molding and hot-pressed sintering. The ceramic-filled material prepared by the method has a low dielectric constant (with epsilon being equal to 2.94), ultralow dielectric loss (with tg[delta] being less than 0.0008, 10 GHz), low water absorption (less than 0.02%) and a small thermal expansion coefficient (less than 20 ppm/DEG C).
Owner:汕头超声覆铜板科技有限公司

Photoelectric composite medium-voltage drum cable with rated voltage of 3.6/6kV-12/20kV and processing technology thereof

The invention discloses a photoelectric composite medium-voltage drum cable with the rated voltage of 3.6/6kV-12/20kV and a processing technology thereof. An optical unit sheath is made from a chlorinated polyethylene rubber material capable of being quickly sulphuretted, so that the optical fiber performance is ensured in the rubber extruding process, and accordingly, all properties of the photoelectric composite medium-voltage drum cable are improved and the service life is prolonged. Besides, owing to the reasonably-designed cable structure and the reasonably-customized processing technology, for example, the stranding direction, the layer-stranding direction and the lay ratio of conductor braided wires, as well as the cabling layer ratio control, are controlled, one frame is changed into an active wire releasing design by cabling equipment, and the design of a weaving reinforced layer and the sulfidization degree of both an inner sheath and an outer sheath are controlled, so that the bendability, the tensile performance and the twisting resistance of the cable are ensured and the service life of the cable is prolonged. In addition, owing to the special neoprene sheath material, the cable is endowed with such favorable properties as ultraviolet resistance, oil resistance, low-temperature resistance, abrasion resistance and the like, thereby having improved service performance and prolonged service life.
Owner:JIANGSU HENGTONG POWER CABLE
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