Takeshi Araya

Effect of conduction particle size on LaB6 thick film resistor

Abstract In order to obtain guidelines develop a thick film resistor (TFR) fireable in an N2 atmosphere and covering a wide practical range of sheet resistivities, i.e. 10–106 ω □ , the microstructures of TFRs were observed, the sintering behaviour of the conduction particles and glass was analysed and the particle size effect on the formation of the conduction path was simulated. Through these investigations, conductive material properties which influence the characteristics of the TFR have been found. (1) As conduction particles fireable in N2, LaB6 particles have suitable properties such as poor sinterability and good wettability with glass. (2) Particle size also has a large effect on the characteristics of the TFR, and it is necessary to use LaB6 ultrafine particles (UFPs) as conduction particles to cover a wide range of sheet resistivities. Using UFPs with specific surface areas of 8.9 and 83.0 m2 g−1, we found the possibility of developing TFRs fireable in N2 with resistivities of 10–106 ω □ in the LaB6-glass system.

Present status of CO2 laser processing

Processing technology using the laser beam is a new technology that is expected to be actively introduced into production lines. This paper discusses the merits of CO2 laser processing compared to low density energy processing that uses gas flames, plasmas and arcs, and other high temperature heat sources, such as electron beams and electrical discharge machines (EDM)s. Features and characteristics of CO2 laser cutting and cutting examples are covered. A new cutting technique with high precision, high efficiency, and clean cutting is introduced along with cutting of aluminum alloy materials. Penetration data of laser welding and a discussion of porosities is presented. Surface modification, demonstrated by hardening of cast iron, and a newly developed ceramic coating method are described.

Study of Production Technique for Metallic Ultra Fine Particles Using Arc Energy

Ultra fine particles (referred to as UFP here) have drawn considerable attention in recent years as possible new function materials. As such, they have been the subject of intensive research in various fields.1 The authors have studied the UFP production technique using arc energy looking closely at the electromagnetic force resulting from arc current. Through this study a method for producing UFP with higher efficiency was developed. The results of that investigation are covered in this report.