- vacuum technology is analysed and the new type permanent magnet materials

new permanent magnet material neodymium, iron, boron, Nd- Fe- B) In 1983 is the third generation of rare earth permanent magnet materials, the magnetic energy product than samarium - Cobalt ( SmCO2) Twice as tall as the permanent magnet alloy, aluminum nickel and cobalt ( Ai- Ni- Co) GAO6 ~ 7 times, more than a dozen times the ferrite, thus aroused the concern of the magnetic field greatly and manufacturing plants the user's interest. Because our country a nd reserves accounted for 80% of the world's total reserves, so vigorously development of ndfeb permanent magnet materials research and production, has a broad prospect and important economic value.

nd is chemically very lively element, so almost all the whole process of ndfeb permanent magnet materials under the environment of vacuum of anaerobic. First is the preparation of ingredients suitable master alloy, and its effective preparation technology is vacuum smelting. The alloy powder must also under anaerobic conditions, in terms of with mechanical broken, without sealing technology. Airflow pulverization is based on the vacuum sealing system, additional series of specialized agencies. Magnets, sintering, heat treatment is more should be carried out under vacuum or protective atmosphere. The magnet surface coating is also used to vacuum impregnation or ion plating technology.

in the northern temperate and cold regions, if there is no coating using double hollow glass, indoor energy of which 80% is through the glass and transmitted to the outside. As in the double hollow glass inside a low radiation on the surface plating membrane, heat transmission loss can be reduced to 40%. This kind of ideal low radiation membrane is indium tin oxide film, the visible light transmittance about 75%, the infrared reflectivity of 90%.

in addition to the above outside shading film and insulation film, there is a '' sun and heat insulation with the membrane layer, this kind of membrane materials can use gold, silver, copper, metal in the three kinds of selective is commonly between the metal clip on the second floor of oxides, an improved adhesion strength and protection of metal coating. He has a high transmittance in the visible light range, high reflectivity in infrared range.

recently developed abroad and into a car windshield interlayer conductive film, the interlayer model has upper and lower layer protective transparent oxide film and the middle of a low resistance layer of metal film, the film resistor is 4 ~ 4. 5 ohm/block, visible light transmittance over 75%, after the electricity - 17 the temperatures of 3 mm ice melted down in 2 minutes.

in terms of coating process, the above several features of the glass is to use magnetic space design to production. Because of the magnetron sputtering method operation is simple and controllable, coating uniformity, repeatability is good, so vacuum coating construction glass has entered the stage of industrial production.