Amorphous magnetic material spray belt or powder milling boron nitride composite ceramic nozzle | Обустройство дома

Amorphous magnetic material spray belt or powder milling boron nitride composite ceramic nozzle | Обустройство дома

There are many varieties of specifications, the specific price needs to consult the owner! Sales Engineer: 18101240246 (Beijing) 13040600776 (Shanghai) Email: kfdianqi@163.   Dear! Prices do not include shipping and do not include tax! You can invoice, invoices need to pay additional taxes! Please contact the store for the invoicing.   Product details: Boron nitride rod Specifications: diameter 120mm, length 100mm Material: Boron nitride ≥99% 1. Basic characteristics of boron nitride ceramics   Boron nitride ceramics are processed by hot-pressing and sintering of boron nitride powder into product blocks according to customer's required size specifications. Boron nitride, also known as white graphite, has a structure similar to that of graphite. It is a hexagonal hexagonal structure with a theoretical density of 2.27g/cm3 and a Mohs hardness of 2. It has good electrical insulation, thermal conductivity, excellent thermal shock resistance and Chemical stability, good moisture resistance to molten metal, slag and glass.   (1) Boron nitride ceramics have excellent machinability and can be processed into complex shapes with extremely small tolerances according to customer requirements.   (2) Boron nitride ceramics are resistant to acid and alkali corrosion, have strong electrical insulation, and have an electrical breakdown strength of 3 to 4 times that of alumina.   (3) Boron nitride ceramics have excellent high temperature resistance, with a temperature of 1800 degrees under vacuum and a temperature of 2100 degrees under atmospheric protection. Nitrogen or argon atmospheres are best used and have the longest life. (4) Boron nitride ceramics have high thermal conductivity: 33W/m.k for hot-pressed products, like pure iron, above 530°C, the most thermally conductive material in ceramic materials.   (5) Boron nitride ceramics are resistant to thermal shock, 1500 degrees of rapid cooling without cracking, 1000 degree furnace internal insulation for 20 minutes, taken out, and air-cooled continuously for hundreds of times without cracking.   (6) Boron nitride ceramics do not react with many metals, ceramics, rare earths, etc., and do not bond. Such as ferrous metal, iron, copper, stainless steel, tantalum, aluminum, tin, chromium, lead, nickel, magnesium, etc.; glass melt, soda glass, cryolite, etc.; silicon lava: slag, fluoride, etc., can be used as a container, Hey, bearing board, etc.   2. Performance parameters of boron nitride   (1) High heat resistance sublimation at 3000 ° C, its strength is 1800 ° C twice as much as room temperature, 1500 ° C air cooling to room temperature tens of times without cracking, not softening at 2800 ° C in an inert gas.   (2) The high thermal conductivity hot-pressed product is 33W/M.K. Like pure iron, it is the most thermally conductive material in ceramic materials above 530 °C.   (3) The coefficient of low thermal expansion coefficient of 2×10-6 is second only to quartz glass, which is the smallest among ceramics. In addition, it has high thermal conductivity, so it has good thermal shock resistance.   (4) Excellent electrical properties, high temperature insulation, 25 ° C for 1014 Ω-CM, 2000 ° C can also reach 103 Ω - CM, is the best high temperature insulation material in ceramics, breakdown voltage 3KV / MM, low dielectric loss 108HZ It is 2.5×10-4 and has a dielectric constant of 4, which is transparent to microwave and infrared.   3, good corrosion resistance and general metals (iron, copper, aluminum, lead, etc.), rare earth metals, expensive, semiconductor materials (silicon, silicon, potassium arsenide), glass, molten salt (crystal, fluoride) , slag), inorganic acid, alkali do not react.   (1) The low coefficient of friction u is 0.16, which does not increase at high temperatures. It is higher than that of molybdenum disulfide and graphite. The oxidizing atmosphere can be used up to 900 ° C and the vacuum can be used up to 2000 ° C.   (2) The high-purity B-containing high impurity content is less than 10 PPM, and the B content is greater than 43.6%.   (3) Machinability The hardness is Mohs 2, so it can be processed into high precision parts by general machining methods.   4. Specification of boron nitride ceramics   According to customer needs, Dingsheng Tetao can provide single-component and boron nitride ceramics with different binders to support the processing of drawings. The product specifications cover a variety of industrial applications and custom profiles, and the product quality has been recognized by customers.   5. Application direction of boron nitride ceramics   (1) Boron nitride ceramics: It can be used for sintering molten metal materials, rare earths, ceramics and other materials. It is resistant to thermal shock and corrosion, and does not react with many metals and ceramic materials. Use a temperature of 2000 degrees, 1500 degrees for 10 minutes, quench to room temperature and repeat 100 times without cracking. The oxidation temperature is 900 degrees, which can replace graphite and alumina ceramics.   (2) Typical application fields of boron nitride ceramics: high-temperature electric furnace components (high-temperature insulating sleeves, etc.), metal evaporation crucibles, various components for molten metal or glass, casting mold parts for precious metals or special alloys, high-temperature support, etc. Parts, molten metal transport tubes, nozzles, etc.   (3) Specific application examples of boron nitride ceramics: boron nitride ceramic crucible; boron nitride ceramic thermocouple protection tube; amorphous boron nitride nozzle; boron nitride insulating tile and pad for polycrystalline silicon ingot furnace Sheet, casing; boron nitride horizontal continuous casting separation ring; boron nitride high temperature precision ceramic parts.   (4) Boron nitride ceramic materials:   (1. Ferrous metals: iron, copper, aluminum, nickel, magnesium, antimony, zinc, etc., alloy Fe-Co-Ni-Si Co-Zr-NB; (2. It does not react with water and acid at room temperature, and is slowly hydrolyzed with water to form boric acid and ammonia; (3. Rare earth, nitride.   (5) Boron nitride ceramics unavailable materials:   (1. Antimony trioxide, chromium oxide pentoxide, molybdenum trioxide, arsenic trioxide, titanium carbide, etc. (2. High-lead glass glaze melts in air at 800-950 degrees and erodes BN, but does not react under the protection of nitrogen or inert gas. (3. Boron phosphate erodes boron nitride in 1400 ° nitrogen, and reacts with hot concentrated or molten alkali and hot chlorine.   6. Precautions for the use of boron nitride ceramics:   (1) The temperature used in the air should not exceed 1000 degrees. If the contact surface of boron nitride and oxygen exceeds 1000 degrees, it will oxidize and peel off.   (2) . Boron nitride is easy to absorb moisture, can not be stored in wet areas, can not be washed, can be directly wiped with sandpaper or scrubbed with alcohol.   Our company can provide you with various specifications of stock blank materials (bars, sheets, blocks, etc.), you can directly buy the blank material, use the existing equipment to process the metal parts into the required ceramic parts, and We also provide processing services for drawings. Our company is equipped with multiple CNC lathes, surface grinders and machining centers with short lead times.