Regenerative refrigerator
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example 1
[0092]Aluminum alloy disks (50 mm in diameter and 7 mm in thickness) were prepared, and were anodized by a common method. By anodizing, the hardness of the aluminum alloy disks increased from pre-anodizing 150 Hv to approximately 500 Hv. Next, these treated (anodized) surfaces were subjected to mechanical polishing. The arithmetic average roughness Ra of the surfaces was measured to be approximately 0.08 μm.
[0093]FIG. 6 illustrates electron microscope photographs of a polished surface. In FIG. 4, (a) is a photograph of low magnification (200-fold magnification), and (b) is a photograph of high magnification (3000-fold magnification). FIG. 6 shows that while the processed surface is relatively smooth, sharply-pointed “edge-like” projecting portions are formed linearly along the same direction partly on the surface.
example 2
[0094]The same as in Example 1, aluminum alloy disks (50 mm in diameter and 7 mm in thickness) were anodized, and thereafter, their surfaces were further subjected to shot peening using alumina particles of 30 μm to 50 μm in particle size. The arithmetic average roughness Ra of the processed surfaces was measured to be approximately 0.79 μm (a value determined by the above-described method).
[0095]FIG. 7 illustrates electron microscope photographs of an obtained surface. In FIG. 7, (a) is a photograph of low magnification (200-fold magnification), and (b) is a photograph of high magnification (3000-fold magnification). FIG. 7 shows that the processed surface is uneven with numerous relatively-large projecting and depressed portions. However, such sharply-pointed “edge-like” projecting portions as in FIG. 6 were not observed, and it is shown that projecting portions have a relatively round form.
[0096]Next, a Ni plating film was provided on the surfaces of the aluminum alloy disks subj...
example 3
[0109]The same as in Example 1, aluminum alloy disks (50 mm in diameter and 7 mm in thickness) were anodized, and thereafter, their surfaces were further subjected to shot peening using alumina particles of 30 μm to 50 μm in particle size. The arithmetic average roughness Ra of the processed surfaces was measured to be approximately 0.2 μm (a value determined by the above-described method).
[0110]FIG. 11 illustrates electron microscope photographs of an obtained surface. In FIG. 11, (a) is a photograph of low magnification (200-fold magnification), and (b) is a photograph of high magnification (3000-fold magnification).
[0111][Evaluation Test 2]
[0112]The above-described abrasion test (ring-on-disk test) was conducted using the aluminum alloy disks of Examples 1 and 3 and a resin ring. A resin formed of the three materials of polyether sulfone (PES), wholly aromatic polyester (WAPE), and polytetrafluoroethylene (PTFE) was used for the resin ring. The resin ring was 37 mm in diameter an...
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Abstract
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