Preparation of boron nitride nano tube enhanced alumina ceramic

The invention relates to a preparation method for alumina ceramics enhanced by a boron nitride nano pipe, which comprises the following steps: A. using a scale to weigh the boron nitride nano pipe, alumina, and an alumina grinding ball respectively according to requirements; B. respectively arranging the weighed materials into a planetary grinding jar to carry out grinding; C arranging the mixed powder after grinding into a black lead die and arranging the black lead die into a multifunctional welding furnace for sintering; D. carrying out temperature preservation to the black lead die into the multifunctional welding furnace for 1 hour plus/minus 10 minutes, then stopping heating, and naturally cooling to the room temperature; and E. obtaining a finished product from a sintered ceramic block by the techniques of grinding and cutting. A device used by the invention is simple and good in safety; the cost is low; the preparation technique is stable; the operation is simple; the production ...

Preparation of boron nitride nano tube enhanced alumina ceramic

The invention relates to a preparation method for alumina ceramics enhanced by a boron nitride nano pipe, which comprises the following steps: A. using a scale to weigh the boron nitride nano pipe, alumina, and an alumina grinding ball respectively according to requirements; B. respectively arranging the weighed materials into a planetary grinding jar to carry out grinding; C arranging the mixed powder after grinding into a black lead die and arranging the black lead die into a multifunctional welding furnace for sintering; D. carrying out temperature preservation to the black lead die into the multifunctional welding furnace for 1 hour plus/minus 10 minutes, then stopping heating, and naturally cooling to the room temperature; and E. obtaining a finished product from a sintered ceramic block by the techniques of grinding and cutting. A device used by the invention is simple and good in safety; the cost is low; the preparation technique is stable; the operation is simple; the production ...

Refractory material for slot-type ventilating brick of refining steel ladle and its making method

High intensity and large length-diameter ratio ceramic spinneret and production method

The invention relates to a ceramic spinneret with high strength and large length-diameter ratio, and belongs to the textile field. The ceramic spinneret is characterized by being made from single-phase or complex phase ceramics with high strength such as Si3N4, Al2O3, Sialon and the like. Thickness of the spinneret is 3-4mm, the length-diameter ratio of a spinneret orifice thereof is more than 15, which causes the spinneret to be capable of bearing the working pressure above 30kg/cm<2>. The large length-diameter ratio can well help relieve brass bulking during spinneret jetting process, and is applicable to a dry-wet spinning process adopted in manufacturing high-strength PAN fiber, and the ceramic materials have the characteristics of good corrosion resistance, good high-temperature resistance and the like, and is suitable for being used and cleaned under a severe environment.

Environmental-friendly halogen-free low-smoke flame retardant material for coaxial cable and preparation method thereof

The invention relates to an environmental-friendly halogen-free low-smoke flame retardant material for a coaxial cable and a preparation method thereof. The environmental-friendly halogen-free low-smoke flame retardant material comprises the following materials with the content by weight percent: 15 to 30 percent of ethane-vinyl acetate copolymer, 8 to 15 percent of linear low-density polythene, 25 to 60 percent of fire retardant aluminium hydroxide, 10 to 20 percent of fire retardant magnesium hydroxide, 5 to 10 percent of compatilizer ethane-vinyl acetate copolymer graft maleic anhydride copolymer or ethane graft maleic anhydride copolymer, 0.2 to 0.8 percent of antioxygen triphenyl phosphate, 0.4 to 1 percent of surface active agent ethenyl (beta-methoxyl ethyoxyl) trisilane and 0.5 to 1.2 percent of lubricant zinc stearate. The preparation method of the environmental-friendly halogen-free low-smoke flame retardant material comprises the following steps: firstly, mixing the fire retardant ...

Refractory material for slot-type ventilating brick of refining steel ladle and its prepn

The present invention relates to steel smelting refractory material, which is beta-Sialon combined SiC with the weight ratio between beta-Sialon and SiC being 1:1. Beta-Sialon has the general expression of Si6-zAlzOzN6-z, with z is 3-4; and SiC is grain size distributed. The production process includes preparing beta-Sialon material, including Si powder, alumina, yttrium oxide and aluminium nitride, based on its expression; distributing grain size of SiC; mixing; pressing to form; sintering beta-Si3N4; converting into beta'-Sialon in the presence of Al2O3, Y2O3 and AIN to prepare the said beta-Sialon combined SiC refractory material. The ventilating brick of the said material has the service life as long as 20-30 heats.

一种提高氮化硅基陶瓷性能/价格比的方法

... 本发明涉及一种提高氮化硅基陶瓷性能/价格比的方法，属于氮化硅陶瓷领域。其特点是以市售廉价耐火级Si#-[3]N#-[4]为原料，经不太复杂细化处理后再选择合适添加剂和烧结工艺，具有特殊的显微结构，使性能/价格比提高。本发明涉及的氮化硅基陶瓷包括氮化硅陶瓷、Sialon材料及氧氮化硅材料，适用于钢铁行业中风机贴片、反击板、筛网筛板等耐磨损、耐冲击部位。 ...

Method for raising P/C ratio of silicon nitride-base ceramic

A method for increasing the P/C ratio of Si3N4-base ceramics including Si3N4 ceramic, Sialon material and silicon oxide nitride material features that the refractory Si3N4 as raw material is fined and the proper additives and sinter process are chosen. It can be used as antiwear and antiimpact parts in iron and steel industry.