Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1988-05-12
1989-08-15
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 7, 501 11, 501 15, 501 16, 501 24, 501 26, 501 32, 501 45, 501 47, 501 48, 501 65, C03C 822, C03C 802
Patent
active
048574864
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of Art
The present invention relates to an adhesive for oxide ceramics and a method of bonding oxide ceramics using the adhesive. More particularly, the invention relates to a novel adhesive for oxide ceramics which can easily and extremely firmly bond oxide ceramics including monocrystalline ceramics of such as alumina, magnesia and so forth, and also to a method of bonding oxide ceramics with use of the adhesive.
2. Background Art
Oxide ceramics have attracted attention as material generally having remarkable mechanical strength and heat resistance at high temperatures, and there have been progressively made applications and developments using such material.
In order to let oxide ceramics fully exhibit their characteristics in the manufacture of various machines or parts thereof with use of the oxide ceramics, it is necessary to effect a mutual bonding of oxide ceramics in the process of the manufacture.
However, there are limitations to do with molding and/or processing of oxide ceramics, so that to fabricate a member having a complex configuration with parts which are molded in a simple configuration, it is indispensable to develop an effective technique for mutually bonding oxide ceramics.
Thus, conventionally it has been practiced for the method of mutually bonding oxide ceramis to operate a hot press at a high temperature and under a high pressure, with or without an adhesive applied between the adherends.
However, according to hot-press methods, the processing has to be carried out at a high temperature and under a high pressure, so that an extreme difficulty is involved in bonding together such members as having a complex configuration or having different configurations from each other.
A same as above is indicated in connection with the HIP method (hot isostatic pressing method), a method which has of late been put for studies.
Thus, there has been a demand for developing an adhesive with which mutual bonding of materials which are large in size and have a complex configuration can be easily made simply by heating and without the need of a particular pressure application.
In this connection, hitherto known adhesives for oxide ceramics and methods of bonding oxide ceramics may be exemplified by the following. least one member selected from the group consisting of sodium fluorides and calcium fluorides or a mixture thereof with kaolin, and a bonding method using the adhesive (Japanese patent publication No. 59-25754) mixture of at least one member selected from the group consisting of alkali metal fluorides and alkaline earth metal fluorides with at least one member selected from oxides of lanthanide elements, and a bonding method using the adhesive (Japanese patent publication No. 60-18627) least one member selected from the group consisting of alkali metal fluorides and alkaline earth metal fluorides or a mixture thereof with kaolin, and a bonding method using the adhesive (Japanese patent publication No. 61-16751) MgO-Al.sub.2 O.sub.3 -SiO.sub.2 ceramics and MgO-Al.sub.2 O.sub.3 -TiO.sub.2 ceramics with a glass containing respective specified amounts of MgO, Al.sub.2 O.sub.3, SiO.sub.2, BaO and ZrO.sub.2, and converting the resulting glass to a crystallized glass (Japanese patent application Kokai publication No. 57-47777)
However, the adhesive strength of each of the above adhesives (a) to (c), which is on the order of 20 to 30 kg/mm.sup.2, is not necessarily sufficient depending on the specific utility of the oxide ceramics, and a particular difficulty with these adhesives resides in that with use thereof it is impossible to bond monocrystalline oxide ceramics of such as for example alumina, magnesia and so forth.
A shortcoming of the above bonding method (d) resides in that the adhesive strength obtainable according to this method is so low that the method is not much useful practically.
DISCLOSURE OF THE INVENTION
A first object of the present invention is to provide an adhesive and a bonding method with and by which it is feasible to firmly bond oxide ceramics throu
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Ebata Yoshihiro
Kawamoto Takamichi
Kouyama Masanori
Tamari Nobuyuki
Dixon Jr. William R.
Hollenbeck Susan
Japan as represented by Director General of Agency of Industrial
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