Novel Sintering Process for Vacuum Sealed Connectors

Aviation plug sintered material:A sintering method in which dry powder is loaded into a mold and then heated under pressure from a uniaxial direction so that molding and sintering are accomplished at the same time. Through the molding and sintering manufacturing metal materials, composite materials and a variety of products process technology. Sealed aviation plug electrical connector hot press sintering characteristics: hot press sintering in the heating and pressurization at the same time, the powder is in a thermoplastic state, which contributes to the particle contact diffusion and flow of mass transfer process, so the molding pressure is only 1/10 of the cold pressure; can also reduce the sintering temperature, shorten the sintering time, which prevents the grain from growing up, to obtain a fine grain size, high density, good mechanical and electrical properties of the product. Can produce ultra-high purity ceramic products without adding sintering additives or molding additives. The disadvantages of hot pressing are the complexity of the process and equipment, strict production control requirements, high requirements for mold materials, high energy consumption, low production efficiency and high production costs. Examples of the use of hot pressing as a means of manufacturing products include alumina, ferrite, boron carbide, boron nitride and other engineering ceramics. Hot pressing equipment:Commonly used hot presses are mainly composed of a heating furnace, a pressurizing device, a mold and a temperature and pressure measuring device. Heating furnace electricity as a heat source, heating element SiC, MoSi or nickel-chromium wire, platinum wire, molybdenum wire and so on. Pressurization device requires smooth speed, constant pressure, flexible pressure adjustment, lever-type and hydraulic type. According to the requirements of material properties, the pressure atmosphere can be air, reducing atmosphere or inert atmosphere. The mold is required to have high strength, high temperature resistance, oxidation resistance, no bonding with the hot pressing material, and its coefficient of thermal expansion should be the same or similar to the hot pressing material. According to the sintering characteristics of the product, hot alloy steel, graphite, silicon carbide, alumina, zirconia, metal ceramics can be used. Graphite molds are widely used. Take silicon nitride as an example. Adding sintering additives such as magnesium oxide and applying a pressure of 300 kg /cm2 at 1700°C can densify the silicon nitride powder. In this case, a layer of boron nitride is coated in the graphite mold to prevent the reaction and to facilitate mold release because the silicon nitride reacts with the graphite mold to form silicon carbide on its surface. When using this mold release agent, care should always be taken under hot pressure. In addition, the difference in expansion coefficients of the model and sample materials, which causes stresses on cooling, is extremely important.The Si3N4-Y2O3-Al2O3 system also yields high-strength sintered bodies under hot pressing conditions.

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