Hayashi Koichi

TL;DR: In this article, a translucent alumina ceramics with extremely high in-line optical transmittance to visible light and light mechanical strength were produced by applying HIP process to a sample which was densified at a relatively low temperature after injection molding.

TL;DR: In this article, the first study of slip cast continuous FGM was conducted and the material system used was Al2O3, W, Ni, and Cr. For preliminary investigation and evaluation of sample properties, several tests were conducted.

Abstract: In a discharge lamp sealing device (30), a light-emitting material is fed from an aperture portion (13b) of an arc tube (11). An electrode member (15) is inserted into the aperture portion (13b), and a glass ring (16c) is set. In this state, a lower end portion of the arc tube (11) is supported by a supporting jig (57). The arc tube (11) is sealed in a hermetic state by a feed tube (51) and inserted into a heater (40). The heater (40) melts the glass ring (16c) by heat of an infrared lamp, thus sealing the aperture portion (13b). At this point, one end portion of the arc tube (11) is supported by the supporting jig (57). As the supporting jig (57) is made of a material having a greater thermal conductivity than the material of the arc tube (11), for example, a metal material such as Al or Cu, the heat is likely to be released from the arc tube (11) to the supporting jig (57), thus restraining temperature rise of the arc tube (11). Thus, the light-emitting material sealed within the arc tube (11) may be prevented from gasifying and escaping to the outside.

TL;DR: In this paper, a TTT diagram for the process of the thermal decomposition and the phase transformations of ammonium aluminum carbonate hydroxide (AACH) to α-alumina has been determined.

TL;DR: In this article, the surface glaze layer has a center line average roughness of less than 0.07 μm as measured with a stylus type surface roughness tester according to JIS B 0651-1996.