Silicon carbide has a corrosive effect on. While the general will be more than 12% Si aluminum alloy called high silicon aluminum alloy, it is recommended to use diamond cutter, but this is not absolute, the silicon content gradually increased to gradually increase the destructive power of the tool. Therefore, some manufacturers in the silicon content of more than 8% on the recommended use of diamond tools. Aluminum silicon content of between 8% -12% of a transition zone, both can use ordinary carbide, diamond tools can also be used. But the use of carbide should be used by the PVD (physical layer) method, no aluminum elements, the film thickness of the smaller tools. Because PVD method and a small film thickness of the tool to maintain relatively sharp cutting edge as possible (otherwise, avoid abnormal growth at the edge of the film needs to be sufficient edge passivation, cut aluminum will not sharp) while the film material containing aluminum may cause damage to the blade and tool combining film and the substrate layer and the pro-cooperation with the workpiece material. Superhard coatings because more aluminum compounds, nitrogen, three of titanium, cemented carbide substrate may be due to a small amount of flaking caused by chipping over the film when peeled. We recommend using one of the following three tools: 1. Not ultrafine particles coated carbide tools 2. With No aluminized coating (PVD) method of carbide cutting tools, such as plating TiN, TiC, etc. 3. Diamond Tool Chip space tool to a large, general recommendations with two teeth, rake angle, relief angle should be large (eg 12 ° -14 °, inclusive tooth posterior horn). If only the general face milling, you can use the main angle of 45 ° indexable face mills, equipped with specialized processing aluminum blades, the effect should be better. Alumina in 1808 in the laboratory by electrolysis of aluminum has also become, in 1884, namely as a building material for use in the United States since Washington Monument steeple; adding various metal elements aluminum composite aluminum materials have been widely used in construction industry on each link. Commonly used aluminum sheet thickness: advanced metal roof (and walls) systems typically 0.8-1.2mm (traditional generally ≥2.5mm).