介绍The removal of transition metal impurities is essential in producing high-conductivity aluminium for wire and cable applications. Titanium, vanadium, chromium and zirconium and other elements – present in the metal as smelter impurities – significantly impede the electrical conductivity of aluminium. These solute impurities are generally precipitated from the melt through the addition of boron aluminium master alloys. Boron Aluminium TreatmentsBoron aluminium treatment is an environmentally safer and more cost-effective alternative to borax addition to electrolytic cells or potassium borofluoride (KBF4) treatment of aluminium in the mixing or holding furnace. Boron aluminium treatment avoids boron contamination of electrolytic cells, and eliminates KBF4难治性攻击。 How Boron Aluminium Treatment WorksAfter the addition of BAl (with an AlB2or AlB12microstructure), solute Ti, V and other impurities react with the aluminium borides, and these particles are precipitated, settling to the bottom of the melt to form a boride sludge. Clean, high conductivity Al is then decanted. Boron is trapped in the sludge at the bottom of the furnace. Adding boron in the launder in rod or cast form is an alternative, and less common treatment method. In this case, borides formed would be trapped in the filters. With either method, boron recovery should not be expected in the final alloy.
硼铝添加剂浓缩的硼铝添加剂达到与浓度较低的合金相同的杂质去除效率，但硼单位成本降低。硼铝降低了喀斯坦大楼中硼处理的成本，减少材料处理并减少库存。 Excessive boron from precipitation treatment can reduce the ability to grain refine. The controlled concentration, precise weight, individual piece identification and high metallurgical cleanliness ensure that boron levels are controlled, and high conductivity is achieved without compromising the desired grain structure in the cast alloy. 使用硼铝添加剂的好处•具有成本效益的添加 • High concentration • Same removal efficiency as lower-concentration alloys •易于添加 •精确的重量 • Individual piece identification •高冶金清洁度 •降低库存成本 •包装较少 Addition Method在施放原代铝之前，必须尽早将硼铝添加到最高的实际温度熔体中。在铸造之前，在持有炉中添加硼的地方，应在铸造前30-120分钟以720-750°C（1330-1380ºF）进行添加。当将硼铝作为槽添加（通常以杆或铸件形式）添加时，这可能会在最终铸件中促进金属间的金属。 Original material sourced from Metallurg Aluminium |