EP0251256A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for joining ceramics by microwave
Assignee: Toyota Central R&D Labs Inc
•
Filing: 1987-06-26
•
Granted: —
•
Expires: 2007-06-26
Abstract
Abstract An apparatus for joining two ceramics using microwave energy, which comprises: a cavity resonator (II) in which the ceramics (20) are placed; a microwave-generating means (I) for producing microwave radiation to be introduced into the cavity resonator; a pressurizing means (III) for pressing the joining surfaces (20l) of the ceramics against each other, and a temperature control means (IV) for controlling the temperature distribution of the ceramics in such a way that the temperature of the ceramics at the joining surfaces is highest and rapidly decreases toward the unjoined ends of the ceramics. The microwave-generating means may include a microwave oscillator, a klystron amplifier, and an isolator. The temperature control means can be dielectric heating means or a combination of a dielectric heating means and a temperature difference-producing means.
Inventors
- 👤 Masao Matsui
- 👤 Hideoki§Narumi-shataku 416 Fukushima
- 👤 Teruo 1756-2 Aza Hosoguchishita Yamanaka
- 👤 Hirozumi Azuma
- 👤 Michiru Esaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6447; H05B6/645; C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B37/00; C04B37/001; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/66; C04B2235/667; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/365; C04B2237/50; C04B2237/52; C04B2237/525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
An apparatus for joining ceramics, comprising: a cavity resonator in which ceramics to be joined are placed; a microwave-generating means for producing microwave radiation to be introduced into said cavity resonator; a pressurizing means for applying a pressure to the ceramics so as to press joining surfaces thereof against each other; and a temperature control means for controlling a temperature distribution of the ceramics so as to make a temperature of the ceramics highest at the joining surfaces of the ceramics and decreased toward unjoined ends of the ceramics.
Claim 2
Independent Claim
89 words
An apparatus for joining ceramics, comprising: a cavity resonator in which ceramics to be joined are placed; a microwave-generating means for producing microwave radiation to be introduced into said cavity resonator; a pressurizing means for applying a pressure to the ceramics so as to press joining surfaces thereof against each other; and a temperature control means for controlling a temperature distribution of the ceramics so as to make a temperature of the ceramics highest at the joining surfaces of the ceramics and decreased toward unjoined ends of the ceramics.
Claim 3
Independent Claim
53 words
An apparatus for joining ceramics according to claim l, wherein said temperature control means comprises a dielectric heating means for producing an electric field in a manner that the electric field is perpendicular to the axis of the ceramics and the electric field intensity is highest at the joining surfaces of the ceramics.
Claim 4
Independent Claim
55 words
An apparatus for joining ceramics according to claim l, wherein said temperature control means comprises a dielectric heating means for producing an electric field in a manner that the electric field is parallel to the joining surfaces of the ceramics and that the electric field intensity is highest at the joining surfaces of the ceramics.
Claim 5
Dependent Claim
60 words
An apparatus for joining ceramics according to claim 1, wherein said temperature control means comprises: a dielectric heating means for applying microwave energy to the ceramics to heat the ceramics by dielectric heating; and a temperature difference-producing means for making the temperature of the joining surfaces of the ceramics higher than the temperature of the unjoined ends of the ceramics.
Claim 6
Dependent Claim
26 words
An apparatus for joining ceramics according to claim 4, wherein said temperature difference-producing means comprises a cooling means for cooling the unjoined ends of the ceramics.
Claim 7
Dependent Claim
43 words
An apparatus for joining ceramics according to claim 4, wherein said temperature difference-producing means comprises an intermediate which is interposed between the joining surfaces of the ceramics and made of a material having a dielectric loss factor larger than that of the ceramics.
Claim 8
Dependent Claim
44 words
An apparatus for joining ceramics according to claim 4, wherein said temperature difference-producing means comprises holding means for holding the ceramics in said cavity resonator, said holding means being made of a material having a dielectric loss factor smaller than that of the ceramics.
References Cited (Backward Citations)
EP0166622A2
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.