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一、前言 为防止高温氧化和热腐蚀,金属材料表面渗铝是沿用已久的方法。迄今为止,工艺繁多,但广为应用的仍是“固体粉末包埋渗铝”工艺(简称包埋渗铝)。国内主要采用铝铁合金粉末包埋渗铝。但由于铝铁合金粉末在球磨制备时须反复过筛。渗铝剂在使用过程中要多次清理,从而对工作环境造成严重污染。 目前,国外采用包埋渗铝工艺时,主要用氧化铝-铝粉末渗铝剂。除了具有一般粉末包埋渗铝工艺的优点外,由于使用了廉价的工业锻烧氧化铝粉末作为渗铝剂的主要原料,为渗层质量更加稳定提供了可靠保证,同时也简化了渗铝剂的清理工作,改善了劳动条件;渗铝剂中铝粉含量可调范围大,渗铝速度比铝铁合金
First, the foreword In order to prevent high temperature oxidation and hot corrosion, aluminizing the surface of metal materials is a long-standing method. So far, a large number of processes, but widely used is still “solid powder aluminized” technology (referred to as embedded aluminized). China mainly uses aluminum-iron alloy powder embedded aluminized. However, due to the preparation of aluminum-iron alloy ball milling must be repeatedly sifted. Alumina in the use of the process to be cleaned several times, resulting in serious pollution of the working environment. At present, the foreign use of embedded aluminizing process, the main alumina - aluminum powder aluminizing agent. In addition to the advantages of a typical powder-coated aluminizing process, the use of inexpensive industrial calcined alumina powder as the main raw material for aluminizing agents provides a reliable guarantee of a more stable layer quality and also simplifies the use of aluminizing agents Of the clean-up work to improve the working conditions; aluminizing agent adjustable range of aluminum content, aluminizing speed than aluminum alloy