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DE3028023A1 - HIGHLY WEAR-RESISTANT PARTS, ESPECIALLY FOR MIXING AND GRINDING UNITS AND METHOD FOR THEIR PRODUCTION - Google Patents

HIGHLY WEAR-RESISTANT PARTS, ESPECIALLY FOR MIXING AND GRINDING UNITS AND METHOD FOR THEIR PRODUCTION

Info

Publication number
DE3028023A1
DE3028023A1 DE19803028023 DE3028023A DE3028023A1 DE 3028023 A1 DE3028023 A1 DE 3028023A1 DE 19803028023 DE19803028023 DE 19803028023 DE 3028023 A DE3028023 A DE 3028023A DE 3028023 A1 DE3028023 A1 DE 3028023A1
Authority
DE
Germany
Prior art keywords
titanium
parts
oxygen
alloy
nitrogen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19803028023
Other languages
German (de)
Other versions
DE3028023C2 (en
Inventor
Dieter Dr. DDR 6530 Hermsdorf Bühling
Werner Dr. DDR 8040 Dresden Fiedler
Wilm Dr. DDR 8036 Dresden Heinrich
Lothar Dr. DDR 8010 Dresden Illgen
Peter Dr. DDR 8045 Dresden Müller
Manfred DDR 6530 Hermsdorf Naumann
Karlheinz DDR 6530 Hermsdorf Rodegast
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HERMSDORF KERAMIK VEB
Keramische Werke Hermsdorf VEB
Original Assignee
HERMSDORF KERAMIK VEB
Keramische Werke Hermsdorf VEB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HERMSDORF KERAMIK VEB, Keramische Werke Hermsdorf VEB filed Critical HERMSDORF KERAMIK VEB
Publication of DE3028023A1 publication Critical patent/DE3028023A1/en
Application granted granted Critical
Publication of DE3028023C2 publication Critical patent/DE3028023C2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crushing And Grinding (AREA)
  • Powder Metallurgy (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Chemical Vapour Deposition (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Power Steering Mechanism (AREA)
  • Tires In General (AREA)
  • Physical Vapour Deposition (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Description

-ι--ι-

Kombinat p Combine p

VEB Keramische Werke Hermedorf 3. 6. 1980VEB Keramische Werke Hermedorf June 3, 1980

Hoehrerschleififeste feile, insbesondere für Misch- und Mahlaggregate und Verfahren iu ihrer Herstellung Hoehrerschleifeste file, especially for mixing and grinding units and processes in their manufacture

Die Erfindung besieht sioh auf Keramikindustrie, Metallurgie und Maschinenbau. Objekte, in denen ihre Anwendung möglioh und «weckmiißig ist, sind r«r*ehleiBfeste Teile in Masohinen und Vorrichtungen, insbesondere Misch- und Mahlaggregat ·. Die Anwendung kann auch unter korrosirem Bedingungen erfolgen·The invention relates to the ceramic industry, metallurgy and mechanical engineering. Objects in which their application is possible and it is wake-up, there are permanent parts in masohines and devices, especially mixing and grinding units ·. It can also be used in corrosive conditions take place·

Bekannt sind Mahlkörper und Mahlt roe» In aus Hartmetall, Stahl, Porsellan, Jlintsteinen, Aohat, Plasten und Titanmetall. Sie gewtthrleisten duroh ihren Abrieb keine rerunreinigungsarme Aufbereitung des Mahlgutes« besitsen nur eine geringe Mahlwirkung und/oder sind durch aufwendige Herstellung teuer.Well known are grinding media and grinding roe »In made of hard metal, Steel, Porsellan, Jlint stones, Aohat, plastics and titanium metal. Thanks to their abrasion, they do not guarantee that they are low in impurities Preparation of the ground material «have only a low grinding effect and / or are due to complex production expensive.

Weiterhin sind bereits Mahlkugeln aus eines Werkstoff auf der Basis von Titan und Sauerstoff aus bis su 97 Gew.-* TiO2 und einem als Plastifikator und Bindemittel wirkenden Stoff, beispielsweise lentonit oder Zellulosettther, bekannt (A. Palatsky, Teehn. Keramik, TSl Verlag Teohnik, Berlin 1954)· Dieser Werkstoff hat den Mangel, daS wegen der geringen Abriebfestigkeit die daraus hergestellten Teil· häufig auegeweohselt werden müssen und Zumahlungen sum Mahlgut die Verarbeitbarkeit das Mahlgutes und die QebrauohseigensohaftenFurther grinding balls made of a material based on titanium and oxygen to below 97 wt .- * TiO 2 and are acting as a plasticizer and binder material, for example lentonit or Zellulosettther known (A. Palatsky, Teehn. Ceramic, TSl Publisher Teohnik, Berlin 1954) This material has the deficiency that, due to the low abrasion resistance, the parts made from it often have to be unmilled and additions to the regrind, the processability of the regrind and the brewing properties

130013/0960130013/0960

P 748/aP 748 / a

der au« dem Mahlgut hergestellten Gegenstände erheblioh herabsetzen. Mahlkörper aus den genannten Werkstoff bedingen duroh ihre relativ geringe Dlohte von etwa 4 gonT* eine relativ lange Kahldauer. Duroh Zussts τοη Bleiverbindungen in Höhe von 2 «is 10 Gewichtsprozent su gepulvertem TiO2 ist e« gelungen, die Abriebfeetigkeit derartiger Mahlkugeln fast su verdoppeln (DS-FS 1 072 179)j der Verschleiß ist aber immer noch relativ hooh und das Auftauchen von Blei in der Zumahlung bringt «eitere Probleme.of the objects made from the grist. Grinding media made of the material mentioned cause their relatively low wire thickness of around 4 gonT * a relatively long balding period. Duroh additions τοη lead compounds in the amount of 2 "is 10 percent by weight of powdered TiO 2 has succeeded in almost doubling the abrasion resistance of such grinding balls (DS-FS 1 072 179), but the wear is still relatively high and the appearance of lead in addition, it brings with it more problems.

Ziel der Erfindung 1st die Verlängerung der fiinsatzdauer versohleißbeanspruchter Teile sowie die weitgehende Vermeidung schädlicher Zumahlungen und Herabsetsung der Mahldauer bei Mfthlproseasen in der Keramikindustrie und Metallurgie.The aim of the invention is to extend the duration of use parts subject to wear and tear as well as avoiding them to a large extent harmful co-grinds and reduced grinding time at Mfthlproseaseen in the ceramics industry and metallurgy.

Dar Erfindung liegt die Aufgabe «ugrunde, Teile mit Oberflächen holier Abriebfee tigkeit unter Beibehaltung der Eigenschaften dea arundkSrpers ansugeben.The invention is based on the task of producing parts with surfaces holier abrasion resistance while maintaining the properties of the arundk body.

ErfinaengsfemMß wird die Aufgabe dadurch gelöst, daß die Teile MW einem (tnmdkSrper, versehen mit einer Oberflächenschicht aus Titan oder einer Br-Besie-Legierung, bestehen, dia mit 0,$ - 15 Atfloarosent Sauerstoff und 0,03 - 7»5 Atomproment Stielest off in gelöster Form legiert ist. ZweokmäÄig let ein Gehalt von 2-10 Atoayrosent Sauerstoff und 1-6 Atemyrosent Stiokstoff, fünstig ein Verhältnis awisohen Sauerstoff and Stielest off von 2 t 1. Ss kann sweckmilig sein, nicht die gssMrtt Oberfläche, sondern mir hoohbean-Sfmamt· Stelle» davon su legieren.ErfinaengsfemMß the object is achieved in that the parts MW consist of a (tnmdkSrper, provided with a surface layer of titanium or a Br-Besie alloy, dia with 0. $ - 15 atmospheric oxygen and 0.03 - 7 »5 atomic moment stem off is alloyed in dissolved form.Two times a content of 2-10 atoayrosent oxygen and 1-6 respiratory tyrosent nitrogen, 5% a ratio of awisohen oxygen and stem off of 2 t 1. Ss can be sweet, not the surface, but me -Sfmamt · place »of it su alloy.

Der OreBAkSrper, dar die erf iaduiE^Bfesatt atisaJsmengesetBte Sohieht trügt, bleibt als Schioktträger in seinen Bigensohaften wakeeinfImIt4 ZweokmAligerweise kamn 4er örumdkÄrper auch am« Titan oder einer Titan-lasis-Legierwag bestehen.The OreBAkSrper, which is deceptive to the experience of the atisaJsmengesette Sohicht, remains as a chioct bearer in its bigenso-like wake-infiMit 4 Two-times 4er örumdkÄrper can also be found on the titanium or a titanium-lasis alloy wagon.

vertan die heokvereohleüfesten feile sowaste the heokvereohleüfesten file like that

hergestellt, smf der 0rsm«k0rfer mit einer Sohieht «us Titan o4er einer Titan-Basis-Legierung ükerssfen wnd im Temperaturbereich von 450 - 1 600*0 72 Stunde bis 100 Stunden inmanufactured, smf the 0rsm case with a shoe made of titanium A titanium-based alloy can be used in the temperature range from 450 - 1 600 * 0 72 hours to 100 hours in

130013/0960130013/0960

BAD ORIGINALBATH ORIGINAL

P 748/aP 748 / a

•liier Atmosphäre nit insgesamt 1-50 ppm Sauerstoff und Stickstoff geglüht wird. Bei Grundkörpern aus Titan entfällt das vor des Glühen erf order liehe Übersiehen, bei bestirnten Ti-Basis-Legierungen kann es Bweckeäfiig sein.• In an atmosphere with a total of 1-50 ppm oxygen and Nitrogen is annealed. In the case of basic bodies made of titanium, there is no need for overlaying, which is required before annealing, in the case of starry ones Ti-based alloys can be bent into cages.

Als hoohrerechleiJfester Werkstoff für sylindrisohe Mahlkörper dient Titan mit 6 Atomprosent gelüsten Sauerstoff und 3 Atoaprosent gelüsten Stickstoff· Gegenüber bekannten Mahlkurpern auf der Basis τοη TiO2 rerlungert sich die Binsatsdauer ua das 20-faohe und die erforderliche Kahldauer rerkürst sich us etna 20 %. Gegenüber Kugeln aus Aohat wird bei gleioher Verschleißfestigkeit eine TerkÜrsung der Mahldauer ua das 5- bis 8-fache ersielt und der Preis ist erheblich niedriger·As hoohrerechleiJfester material for sylindrisohe grinding media titanium is used with 6 Atomprosent covet oxygen and 3 Atoaprosent covet nitrogen · Compared with known Mahlkurpern based τοη TiO 2, the Binsatsdauer rerlungert including the 20-faohe and the required Kahl duration rerkürst to us etna 20%. Compared to balls made from Aohat, the grinding time is reduced by 5 to 8 times and the price is considerably lower with the same wear resistance.

130013/0960130013/0960

BAD ORIGINALBATH ORIGINAL

Claims (4)

Patentansprüche P 748/aPatent claims P 748 / a 1. Hochversohleiißfeete Teile, inebeeondere für Misch- und lahlaggregate, gekennseiohnet daduroh, daß «ie aus einem Grundkörper, rersehen mit einer Oberf läohensohioht aus Titan oder einer Ti-Baeis-Legierung, bestehen, die mit 0,5 - 15 Atomprosent Sauerstoff und 0,03 - 7,5 Atomproeent Stickstoff in gelöster Fora legiert ist.1. Hochversohleiißfeete parts, especially for mixed and Lahlaggregate, known that «ie from one Basic body, rersehen with a surface Titanium or a Ti-Baeis alloy, exist with 0.5 - 15 atomic percent oxygen and 0.03 - 7.5 atomic percent Nitrogen is alloyed in dissolved fora. 2. Hoohrersohleififeste Teile nach Anspruoh 1, gekennseiohnet daduroh, daß die Oberfläohe mit 2-10 Attmprocent Sauerstoff und 1-6 Atomproeent Stickstoff legiert ist.2. Hoohrersohleififeste parts according to claim 1, gekennseiohnet daduroh that the surface with 2-10 attmprocent oxygen and 1-6 atomic percent nitrogen is alloyed. 3. Hoohversohleißfeete Teile naoh Anspruoh 1 und 2, gekennzeichnet daduroh, daß in der auflegierten Oberfläche raisohen Sauerstoff und Stiokstoff ein Verhältnis ron 2 : 1 besteht.3. Hoohversohleißfeete parts naoh claims 1 and 2, characterized daduroh that in the alloy surface The ratio of oxygen to nitrogen is 2: 1. 4. HoohTersohleißfeste Teile naoh Anspruoh 1 - 3t gekennseiohnet dadurch, daß nur beat inte rersohleißbeanepruohte OberflMohenstellen erfindungsgeattß legiert sind.4. High wear-resistant parts according to requirements 1 - 3t known by the fact that only beat inte rersohleißbeanepruohte OberflMohenstellen are alloyed according to the invention. 5· Hoehrersohleißfeete Teile naoh Anspruoh 1-4« gekenn-■eiohnet daduroh, daß der OmndkOrper aus Titan oder einer Titan-Basis-Legierung besteht.5 · Hoehrersohleißfeete parts according to claims 1-4 «identified daduroh that the OmndkOrper made of titanium or a titanium-based alloy. 6·) Verfahren lur Herstellung heehrersohlAififester Teile, gekennseiohnet daauroh, daß der QrundkOrper «it einer Sohioht ans Titan oder einer Titan-Iasis-legierung übersogen wird und Ia Temperaturbereioh ran 450 - 1 6000C V2 Stunde bis 100 Stunden in einer AtaosphMre mit insgesamt 1 bis 50 ppa Sauerstoff und Stiokstoff geglüht wird.6 ·) method lur production heehrersohlAififester parts gekennseiohnet daauroh that the QrundkOrper "it a Sohioht to the titanium or a titanium-Iasis alloy is absorbed and Ia Temperaturbereioh ran 450-1600 0 C V2 hour to 100 hours in a AtaosphMre total 1 to 50 ppa oxygen and nitrogen is annealed. 130013/0960130013/0960 A ORlGiNALA ORlGiNAL
DE19803028023 1979-09-19 1980-07-24 Highly wear-resistant parts, especially for mixing and grinding units Expired DE3028023C2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD21562479A DD146556B1 (en) 1979-09-19 1979-09-19 HIGH-WEAR-RESISTANT PARTS, ESPECIALLY FOR MIXING AND GRINDING AGGREGATES AND METHOD FOR THE PRODUCTION THEREOF

Publications (2)

Publication Number Publication Date
DE3028023A1 true DE3028023A1 (en) 1981-03-26
DE3028023C2 DE3028023C2 (en) 1983-06-30

Family

ID=5520157

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803028023 Expired DE3028023C2 (en) 1979-09-19 1980-07-24 Highly wear-resistant parts, especially for mixing and grinding units

Country Status (7)

Country Link
JP (3) JPS5653756A (en)
CS (1) CS235919B1 (en)
DD (1) DD146556B1 (en)
DE (1) DE3028023C2 (en)
FR (1) FR2465788A1 (en)
HU (1) HU190775B (en)
YU (1) YU240580A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544748A2 (en) * 1981-02-06 1984-10-26 Maschf Augsburg Nuernberg Ag Process for producing a protective oxide layer
JPS59145705A (en) * 1983-02-10 1984-08-21 Toyo Soda Mfg Co Ltd Production of pulverous powder of high purity titanium carbide
JPS6019054A (en) * 1983-07-14 1985-01-31 石原産業株式会社 Crushing of titanium oxide particulate material
JPS6032052A (en) * 1983-08-03 1985-02-19 Toray Ind Inc Electrostatic recording body
US5171480A (en) * 1988-08-29 1992-12-15 Matsushita Electric Industrial Co., Ltd. Electrophotographic photosensitive member containing a conductive layer which comprises a resin and a conductive zinc oxide having a tetrapad structure
US5183594A (en) * 1988-08-29 1993-02-02 Matsushita Electric Industrial Co., Ltd. Conductive resin composition containing zinc oxide whiskers having a tetrapod structure
JP3179787B2 (en) * 1996-03-26 2001-06-25 シチズン時計株式会社 Titanium or titanium alloy member and surface treatment method thereof
KR100494751B1 (en) 1996-07-18 2005-06-13 시티즌워치 코리미티드 Titanium-base Decoration Member and Method for Curing the Same
JP2002097914A (en) * 2000-07-18 2002-04-05 Fuji Oozx Inc Engine valve made of titanium alloy and method of manufacturing it
TWI404811B (en) * 2009-05-07 2013-08-11 Atomic Energy Council Method of fabricating metal nitrogen oxide thin film structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1052243A (en) * 1900-01-01
CH539129A (en) * 1971-01-29 1973-07-15 Pompey Acieries Process for the surface hardening of titanium and its alloys and products thus obtained
GB1351062A (en) * 1971-04-05 1974-04-24 Metaux Precieux Sa Process for heat treating titanium articles and articles obtained thereby

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1052243A (en) * 1900-01-01
CH539129A (en) * 1971-01-29 1973-07-15 Pompey Acieries Process for the surface hardening of titanium and its alloys and products thus obtained
GB1351062A (en) * 1971-04-05 1974-04-24 Metaux Precieux Sa Process for heat treating titanium articles and articles obtained thereby

Also Published As

Publication number Publication date
JPS64101B2 (en) 1989-01-05
FR2465788B3 (en) 1982-07-02
JPS5653757A (en) 1981-05-13
DD146556B1 (en) 1982-09-29
DE3028023C2 (en) 1983-06-30
YU240580A (en) 1983-12-31
CS235919B1 (en) 1985-05-15
DD146556A1 (en) 1981-02-18
FR2465788A1 (en) 1981-03-27
JPS5653756A (en) 1981-05-13
HU190775B (en) 1986-11-28
JPS5653754A (en) 1981-05-13

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