项目介绍（简介、技术特点、应用范围、市场前景、效益分析及对投资者要求）

  (中文)

  1．简介：

  陶瓷刚玉磨料因其硬度大、机械强度高、抗破碎性强、化学稳定性和热稳定性好、价格便宜等原因在磨料市场中占有较大份额。使用电熔法生产刚玉磨料的熔融温度要高达2200℃，存在能耗较高的问题；常规加热手段烧结时间长，加热效率较低，烧结效果较差。

  本项目通过在Al2O3中加入适量添加剂，采用微波对Al2O3进行加热烧结，依靠Al2O3的自身吸收微波能量，具有升温速度快、能源利用率高、加热效率高、Al2O3内部同时均匀加热和安全卫生无污染等特点。微波烧结法制备陶瓷刚玉磨料能提高产品的均匀性和成品率，改善陶瓷刚玉磨料的微观结构和性能。

  2．技术特点：

  （1）引入适量复合烧结添加剂调节Al2O3的烧结特性，利用各添加剂的协同作用，可促进液相生成，加速物质传输，抑制Al2O3晶粒间的物质扩散，阻碍Al2O3晶粒的生长，得到晶粒较小的陶瓷刚玉磨料烧结体。

  （2）利用微波加热对Al2O3进行烧结，使微波与Al2O3发生耦合产生热量，实现Al2O3内部零梯度均匀加热，加热至烧结温度实现Al2O3的致密化。Al2O3直接吸收微波并通过介质损耗转化为热能，能量利用率极高，有升温速度快、加热效率高、能耗低、无污染等优点。

  （3）陶瓷刚玉磨料的烧结载体和低温辅助加热体一体化。低温时，SiC吸收微波能量产生热量，产生的热量通过热传递传导给Al2O3，实现Al2O3的低温加热；当温度达到Al2O3临界温度后，Al2O3自身吸收微波能量产生热量，实现Al2O3的高温加热和烧结。

  （4）采用Al2O3坯体颗粒进行微波烧结，Al2O3坯体颗粒所含物料少，内部空隙等缺陷较少，组织结构相对均匀，微波烧结用时更短，Al2O3坯体颗粒堆积造成的颗粒间空隙小，加热过程中，颗粒间的空隙温度可较快地达到颗粒温度，快速消除了烧结体的温度梯度，减小烧结体在烧结过程中的热量流失，可进一步缩短烧成时间，提高刚玉磨料的烧成质量。

  3．应用范围、市场前景：

  本项目通过微波烧结Al2O3制备陶瓷刚玉磨料，能耗小，产品均匀性和成品率高，适于大规模量产。制备的陶瓷刚玉磨料性能优良，适用于砂轮、固结磨具、涂附磨具、超高速磨削等磨具的生产，可用于机械、交通、电子、建筑、化工、石油、采矿、军工、航天等各个领域，有着非常广阔的市场前景。

  4．效益分析及对投资者要求：

  微波烧结法制备陶瓷刚玉磨料，可大幅降低陶瓷刚玉磨料的生产成本，可改善陶瓷刚玉磨料的力学性能。相较于电熔和常规加热生产的刚玉磨料，每生产1吨刚玉磨料，微波烧结法耗电量可节约1500kW·h/t，而磨料的抗压强度可提高20%。本项目对投资者无特殊要求。

  (英文)

  Introduction:

  Because of its high hardness, high mechanical strength, strong crushing resistance, good chemical stability, good thermal stability and low price, ceramic corundum abrasives have a large market of the abrasives. The energy consumption of corundum abrasives produced by electric melting method is very high as the melting temperature is above 2200 ℃. The conventional heating method has long sintering time, low heating efficiency and poor sintering effect.

  This project, produceing ceramic corundum abrasives by adding additives and sintering in the microwave, has the advantages such as fast heating speed, high energy utilization, high heating efficiency, safety, and no pollution. Ceramic corundum abrasives prepared by microwave sintering can improve the uniformity and yield of products, and improve the microstructure and properties of the abrasives.

  Technical characteristics:

  (1) The sintering characteristics are adjusted by sintering additives. The formation of liquid phase, the mass transfer and diffusion of Al2O3, the growth of grains, are promoted.

  (2) The microwave sintering of Al2O3 is uniformly heated and Al2O3 directly absorbs microwave and transforms it into heat energy through dielectric loss. The microwave sintering of Al2O3 has the advantages of high energy utilization rate, fast heating speed, high heating efficiency, low energy consumption, no pollution.

  (3) The sintering carrier of ceramic corundum abrasives and the low temperature auxiliary heating body are integrated. At low temperature, the SiC absorption of microwave energy to generate heat, the heat generated by SiC transfer to the Al2O3, realize low temperature heating of Al2O3; when the temperature reaches the critical temperature of Al2O3, Al2O3 is heated and sintered at high temperature by absorption of microwave energy.

  (4) The microwave sintering of Al2O3 particles. As Al2O3 particles containe less material, less internal gaps, relatively uniform structure, the sintering time is shorter. The rapid elimination of the temperature gradient of the sintered Al2O3 particles, reduce the heat loss in the sintering process, can further shorten the sintering time, and then improve the quality of sintered corundum abrasives.

  Applications:

  Ceramic corundum abrasives prepared by microwave sintering of Al2O3 have low energy consumption, high product uniformity and high yield, and are suitable for mass production. Ceramic corundum abrasives can be used in grinding wheel, consolidation abrasive, coated abrasives, ultra high speed grinding and other abrasive production, and have a very promising market.

  Benefits:

  Ceramic corundum abrasives prepared by microwave sintering can greatly reduce the cost and improve the mechanical properties of ceramic corundum abrasives. Compared to the corundum abrasives produced by electric melting and conventional heating, the power consumption saves 1500kW h/t producing 1 tons of corundum abrasives by microwave sintering, and the compressive strength can be increased by 20%. This project has no special requirement for investors.