Method of producing an aluminium boride

The term "aluminum boride" as used herein is to be understood as including both aluminum diboride (AlB₂) and aluminum dodecaboride (AlB₁₂), both of which are potentially useful precursors for production by reaction sintering of refractory composites containing titanium diboride (TiB₂). However, efforts to develop a commercially viable method for manufacturing TiB₂ - containing materials based on reactions such as the above are handicapped by the restricted commercial availability and the consequent high price of AlB₂ and AlB₁₂. Intended to produce these materials at a lower cost using commercially available raw materials and, as far as possible, production processes in common industrial use. GB-A-1,192,677 describes a method of preparing aluminum diboride flakes that adds up to 5% of a boron source to a molten aluminum bath. The bath is maintained at an elevated temperature, not exceeding 975°C, for sufficient time to permit solubilization of the boron source and crystallization of the aluminum diboride flakes. The flakes may be recovered by, for example, filtering the melt through a perforated graphite plate. This disclosure is concerned solely with producing aluminum diboride in flake form, and there is no suggestion to remove the filter medium by selective chemical attack. According to one embodiment of the present invention, there is provided a method of producing an aluminum boride in solid form, which method comprises providing a body of molten aluminum containing suspended particles of an aluminum boride, passing the body of molten aluminum through a filter which is previous to the molten aluminum but which retains the suspended particles, the filter medium being alumina in the form of a plate or compact of pressed unbonded or lightly sintered refractory aggregate or a bed of loose granular aggregate supported on a refractory alumina grill and recovering the aluminum boride in solid form from the filter by dissolving the alumina filter medium in acid under conditions in which the aluminum boride is insoluble. If you are looking for high quality, high purity, and cost-effective Aluminium boride, or if you require the latest price of Aluminium boride, please feel free to email contact mis-asia.

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