Ceramic sheath device with multilayer silicon nitride filler ins

Details Ceramic sheath device with multilayer silicon nitride filler ins Ceramic sheath device with multilayer silicon nitride filler ins

1996-04-10

1998-09-22

Jeffery, John A.

Electric heating

Heating devices

Resistive element: igniter type

219548, 219544, 338226, 374208, C04B 3558, F23Q 700

Patent

active

058117610

ABSTRACT:
A ceramic sheath capable of preventing damage to conductive wire rod exhibits excellent thermal resistance and a thermal shock resistance. A conductive wire rod is provided in a protective pipe of silicon nitride, silicon carbide or SiAlON so as to extend longitudinally from one end toward the other, and buried in a filler of reaction sintered silicon nitride. The filler comprises two layers, i.e. a core portion having a low sintering time size variation ratio, and a seal portion constituting a boundary layer between the core portion and the protective pipe and having a sintering time size variation ratio higher than that of the core portion. The conductive wire rod comprises a coil of a metal wire. The coil is formed helically along its whole length, and the winding pitch of the coil is set small, large and small in this order from the front end portion of the shell of the protective pipe toward its base end portion.

REFERENCES:
patent: 4786781 (1988-11-01), Nozaki et al.
patent: 5084606 (1992-01-01), Bailey et al.
patent: 5304778 (1994-04-01), Dasgupta et al.
H. Masayasu, "Patent Abstracts of Japan", JP 57 073326, vol. 6, No. 157, May 8, 1982.

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