| 摘要 |
PROBLEM TO BE SOLVED: To provide an interior-exterior material having granite tone pattern on the surface of an aluminum alloy, and to provide a production method therefor. SOLUTION: An aluminum alloy is subjected to heat treatment at a recrystallization temperature+50°C to 450°C for 0 to 6 hr as preheat treatment, then after the application of strain of 0 to 5% thereto, the alloy is further subjected to heat treatment at 400 to 630°C for 0 to 6 hr as control heat treatment in such a manner that the total time of both heat treatment becomes 30 min to 12 hr, and a stock having crystals with a mean particle diameter of 0.1 to 5 mm is thereby prepared. The stock is subjected to pretreatment and anodic oxidation treatment for vividly revealing difference in the crystals and crystal orientation. Then utilizing various coloring techniques such as dyeing, electrolytic color development, alloying color development and electrolytic coloring, a granite tone pattern having a glossiness of 5 to 80% (85°in an incident angle and a measured angle), and a color tone of green, blue and purple system, and, in the Munsell system, having a hue (H) of 5GY to 10P, a lightness (V) of 1 to 7 and a color saturation (C) of 0.2 to 6 is formed. In this way, the provision of a lightweight, crack-free working material with a granite tone pattern made of an aluminum alloy for the application related with housing materials, electronics, mobiles, car accessories in which slate has not been conventionally able to be used is made possible. COPYRIGHT: (C)2006,JPO&NCIPI
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