Abstract:
A cementing agent used for electrically cementing ceramic members with each other by energizing a cementing agent at high temperature, which can well wet ceramic material and react with it and of which the conductive component comprises a fluoride, chloride and/or oxide ion conductor capable of forming carrier ions by preheating and giving a higher conductivity than that of the ceramic material when energized. The density or mobility of the carrier ions tends to be reduced in a fused state to cause a gradual increase in the resistance of a fused cementing agent, and an electrical path migrates smoothly after heating by energization as a result of an increased resistance accompanying an change in the composition or the like.
Abstract:
A method of bonding ceramic members together and an insert material for heat-bonding used therein. In this method, ceramic members to be bonded together are subjected to dielectric heating in a state in which a heating ceramic material having a dielectric constant greater than that of the ceramic members is interposed therebetween. In such dielectric heating, mainly the heating ceramic having a higher dielectric constant is heated and a temperature of butting parts of the material and members is raised to a sufficient degree for bonding. In this bonding operation, the application of pressure to butting parts is preferable, however, not always necessary. When no pressure is applied, layers of bonding agent are preferably formed on the butting surfaces of the heat-bonding insert beforehand.
Abstract:
A method of electrically joining objects to be joined including at least one of butt joint between electrically conductive ceramic members to be joined together and butt joint between electrically conductive ceramic and metal members to be joined together, while relieving thermal stress developing particularly in ceramic members to be joined. In the method of electrically joining objects including at least one of butt joint between conductive ceramics and butt joint between an electrically conductive ceramics and a metal: joining agent is interposed between joining parts; at least one set of electrodes are disposed to and in contact with the members to be joined in positions interposing at least one or more butt joints therebetween; first heating means to heat members to be joined by Joule heat with electric voltage impressed between said electrode is provided; second heating means for heating a part at which a sharp temperature gradient is formed on the members by only said first heating means and the vicinity thereof is formed; and temperature at butted parts is raised to a temperature for joining while using both first and second heating means so that thermal stress developing due to temperature gradient in the members to be joined may be smaller than fracture stress of said members.
Abstract:
A method of obtaining good junction, a device therefor and an adhesive agent therefor in electrically joining large ceramic products or ceramic products having complex shapes. In particular, there are provided an improved method of electrically heating conductive ceramics or adhesive agent (using a switching system including a plurality of fixed current conducting electrodes, or a system for changing over two kinds of power source outputs); a method of controlling auxiliary heating; a method of controlling a holding device (employment of a freely expanding balance mechanism at the time of pre-heating, control by measuring the amount of change); a method of adjusting the shape of a junction portion (improvement in the joint structure); and an adhesive having excellent junction strength.
Abstract:
A vehicle resin-made shock absorbing member for use as a vehicle bumper beam and a production process thereof, wherein a vehicle resin-made shock absorbing member (10) is composed of a long curved portion (20) having a hollow portion, and mount portions (30) each provided contiguously from and integrally with the curved portion (20) at each of the two lengthwise ends of the curved portion (20), for mounting to a vehicle body (11). Each mount portion (30) has a hollow portion and a solid portion that is formed at least in a position located on a lengthwise extension of the curved portion (20) so as to allow the member (10) to be mounted from the front of the vehicle and to provide a sufficient shock absorbing capability over the entire length of the member (10).