High silicon cast aluminium spectrum standard sample and its preparation method

Abstract

The standard specimen contains chemical elements with following weight ratios in pure aluminium Si: 1.03-13.70, Fe: 0.147-1.50, Cu: 0.125-7.44, Mn: 0.090-1.05, Mg: 0.049-1.53, Zn: 0.052-1.05, Ti: 0.034-0.274 etc. Since the Al-Sr modification is adopted, thus the specimen provides the features of even chemical elements, compact structure, free of bulky initializing coarse grains as well as raised processability. The long-playing diffusion fusion technique adopted makes silicon diffuse to aluminium adequetely so as to increase uniformity of chemical elements in the specimen evidently.

Description

(1) Technical field [0001] The invention relates to a standard sample for identifying aluminum materials, in particular to a spectral standard sample of high-silicon cast aluminum alloy. (2) Technical background [0002] Due to the small thermal expansion coefficient, good wear resistance and high temperature strength of high silicon cast aluminum alloy, it has been widely used in recent years, for example, pistons and engine blocks that require good wear resistance and high strength at high temperature. As the market for high-silicon cast aluminum alloys continues to expand, the corresponding requirements for product quality are becoming more and more stringent. Existing high-silicon cast aluminum alloys are prepared through common processes such as smelting, chemical composition adjustment, casting, homogenization, extrusion and sawing in sequence. It mainly contains Si, Fe, Cu, Mn, Mg, Chemical elements such as Zn, Ti, Ni, Pb and Sn. This high-silicon cast aluminum allo...

AI Technical Summary

Problems solved by technology

This high-silicon cast aluminum alloy standard sample has poor uniformity in chemical composition, especially the inhomogeneity of Si, Cu, Mg and other elements, large grains, primary crystal silicon and eutectic silicon, and is extremely difficult to extrude; Sample 11.70% Si, 0.644% Cu, 0.883% Mg high-silicon cast aluminum alloy standard sample as an example, its relative standard deviation RSD are 0.23, 0.030, 0.042 respectively, taking the imported standard sample 9.54% Si, 2.99% Cu, 0.990 %Mg high-silicon cast aluminum alloy standard sample as an example, its relative standard deviation RSD is 0.17, 0.074, 0.023 respectively; this type of standard sample is likely to cause misjudgment by inspectors, and it is difficult to meet the requirements of composition control