Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1980-02-21
1983-05-17
Rutledge, L. DeWayne
Metal working
Method of mechanical manufacture
Assembling or joining
29589, 357 79, 357 81, H01L 2152
Patent
active
043833551
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a method for the production of a sealed housing for a disk-shaped semiconductor body exhibiting at least one pn-transition, which is capable of being pressure-contacted on each of its two main sides by way of electrode parts and a pressure contact body as housing enclosure, both thermally and electrically, whereby each pressure contact body is provided with an elastic seal ring. This seal ring is employed in an insulating housing of a hollow cylindrical shape which encloses the semiconductor body. It is intended for use for controllable power semiconductor elements. The housing has a pass-through for control electrode connection.
The process finds application in the production of disc cell housings for controllable and non-controllable power semiconductor elements, whereby, in special cases, it is also possible to insert two semiconductor bodies after interposition of appropriate metallic discs between the pressure contact bodies, into the insulation housing.
A housing with the previously described seal ring technique has already been proposed for a power semiconductor element (German Patent Application No. P 28 25 682.5) and U.S. patent application No. 192,511. In order to carry out the seal ring technique of the older proposal, the pressure contact bodies must be provided with a circumferential groove to accept the seal ring. Further, it is appropriate to polish the inside of the insulating housing from a ceramic material in order to assure appropriate sealing.
It is the task of the invention to save preparatory work in the production of the previously described housing in respect of sealing technique and yet to obtain a tight housing closure.
The solution of the task consists of the fact that, according to the invention:
(a) tubing sections of a resilient plastic material that has been treated by an electron irradiation treatment are used as seal rings,
(b) the tubing sections are stretched onto the two pressure contact bodies and
(c) the tubing sections are heated after their insertion into the insulating housing for purposes of relaxation, whereby they maintain mechanical coupling between said pressure contact bodies and the insulating housing and seal the housing under increase of their wall thickness.
Plastic tubing material which is treated by electron irradiation, is generally known and is obtainable in the marketplace, e.g. Viton tubing from Raychem, Great Britain or DuPont, U.S.A. Viton(trademark) is a synthetic caoutchouc (fluoro-caoutchouc), a copolymer from hexafluoro-propylene and vinylidene fluoride (Plastics Dictionary by Dr. K. Stoeckhert, 4th Edition (1967), pg. 375). The applicability of such tubing sections of such material, preferably of Viton, for the sealing of power semiconductor-disc cell housings, has so far not yet been recognized.
Advantageously, each tubing section can be stretched onto the corresponding pressure contact body without the requirement of a groove or a ring seat on its edge. After insertion into the insulating housing, heating suffices to obtain a good seal between the corresponding pressure contact body and the interior wall of the insulating housing which, preferably consists of a ceramic material; because the tubing section relaxes upon heating and gets to a greater wall thickness, presumably because of the splitting of the cross linking or crystallization nuclei of the internal structure that had been previously formed by the electron irradiation. Advantageously, a mechanical preparation of the interior wall of the insulation housing can be eliminated.
In the following, the invention is further explained on the basis of an exposition sample presented in a drawing.
Shown are:
FIG. 1: A cross section of a controllable power transistor building element with housing,
FIG. 2: a pressure contact body with tubing section stretched on and
FIG. 3: the insertion of two pressure contact bodies with tubing section stretched-on into an insulating housing.
FIG. 1 shows a pressure contactable, controllable power transistor building element with housi
REFERENCES:
patent: 3086242 (1963-04-01), Cook et al.
patent: 3243211 (1966-03-01), Wetmore
patent: 3297819 (1967-01-01), Wetmore
patent: 3443168 (1969-05-01), Camp et al.
patent: 3654529 (1972-04-01), Lord
patent: 3837000 (1974-09-01), Platzoeder et al.
patent: 3886586 (1975-05-01), Bahlinger et al.
patent: 4126758 (1978-11-01), Krumme
Encyclopedia of Polymer Science and Technology (1971), New York, John Wiley & Sons, vol. 14, pp. 600-617.
BBC Brown Boveri & Company Limited
Rutledge L. Dewayne
Schiavelli Alan E.
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