PL75811B1 - - Google Patents
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- Publication number
- PL75811B1 PL75811B1 PL1972159957A PL15995772A PL75811B1 PL 75811 B1 PL75811 B1 PL 75811B1 PL 1972159957 A PL1972159957 A PL 1972159957A PL 15995772 A PL15995772 A PL 15995772A PL 75811 B1 PL75811 B1 PL 75811B1
- Authority
- PL
- Poland
- Prior art keywords
- dispersoid
- titanium
- aluminum
- alloy
- weight
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
- B22F2003/208—Warm or hot extruding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
Porównujac prety nr 4 i 5 wydaje sie, ze temperatura wzrostu ziarna w tych warunkach rosnie równiez z wiekszymi zawartos¬ ciami cyrkonu (patrz tablica 3), przy czym cyrkon zostal pomyslany jako dodatkowy rodzaj dyspersoi- du taki, jak tlenek, weglik, azotek. Porównanie pretów nr 3 i 6 prowadzi do wniosku, ze w wa¬ runkach walcowania na zimno i obróbki cieplnej temperatura potrzebna do calkowitego wzrostu ziar¬ na maleje z wiekszymi czasami mechanicznego sta¬ piania stopu.Przyklad VI. Rózne produkty wykonane z me¬ chanicznie stapianych stopów proszkowych opisa- 5 nych w przykladzie IV byly badane na rozciaganie w temperaturze 1038°C w stanie po wyciskaniu, obróbce na zimno przy redukcji 16% z ziarnem wyrosnietym (wyzarzone w temperaturze 1316°C przez Va godziny). Wyniki zestawiono w tablicy 6, io gdzie numery pretów sa te same, co odpowiadaja¬ cych im proszków. Przypuszczalne naprezenia roz¬ rywajace po 100 godzinach sa równiez zestawione w tablicy 6.Z tablicy 6 wynika, ze obróbKa na zimno przy 15 redukcji do 16% daje, ogólnie biorac, wzrost wy¬ trzymalosci na rozerwanie w temperaturze 1038°C, a prety z powiekszonym ziarnem wykazuja dalszy wzrost wytrzymalosci na zerwanie w temperatu¬ rze 1038°C. 20 Widoczne jest z tablicy 5, ze próbki (prety nr 1 i 4 odpowiadaja pretom nr 1 i 4 z tablicy 6) ze zwiekszonym ziarnem w temperaturze nizszej od 1038°C tak, jak te prety nr 1 i 4 obrobione ha zimno z ziarnem powiekszonym przez nagrzewanie 25 az do temperatury badania 1038°C i nastepnie wy¬ zarzane w temperaturze 1316°C w czasie xh godzi¬ ny, nie wykazuja widocznych efektów w stosunku do swoich wlasnosci wytrzymalosciowych. 30 PL PL
Claims (15)
1. Zastrzezenia patentowe 1. Stop zelaza zawierajacy wagowo 10—40% chro¬ mu i/lub 1—10% aluminium, 0—10% niklu, 0—20% kobaltu, 0—5% tytanu, 0—2% kazdego z metali ziem 35 rzadkich, itru, cyrkonu, niobu, hafnu, tantalu, krze¬ mu i/lub wanadu, 0—6% wolframu i molibdenu, 0—0,4% wegla, 0—0,4% manganu, reszte poza przy¬ padkowymi skladnikami i zanieczyszczeniami sta¬ nowi zelazo i majacy 0,1—10% objetosciowych za- 40 roodpornego dyspersoidu, znamienny tym, ze sred¬ nia wielkosc czastki dyspersoidu wynosi 5—500 na¬ nometrów i jego punkt topliwosci wynosi co naj¬ mniej 1510°C, przy czym dyspersoid znajduje sie w postaci czastek rozmieszczonych zasadniczo jed- 45 nolicie w calym produkcie, a produkt ma gestosc Tablica 6 Naprezenie rozrywajace w 1038°C * Pret nr 1 2 3 4 5 6 1 7 Po wyciskaniu napr. 34,47 34,47 34,47 34,47 27,58 27,58 27,58 zywot. 0,4 6,2 0,1 0.1 1,2 1,1 0.5 wy* dluz. 6,4 4,0 33,6 39,2 8,8 0.6 16,0 Szacunkowe naprezenie dla zywot- nosoi 100 godz. (MN/m9) 16,55 25,5 17,2 17,2 17,9 17,9 16,55 Obrobiona na zimno, red. 16% napr. 34,47 34,47 34,47 34,47 34,47 34,47 34,47 zywot. 3,1 68,4 13,3 350,0 54,1 2,3 2,3 wy¬ dluz. 2.4 4,0 0,8 1,6 2,4 2.4 Szacunkowe naprezenie dla zywot¬ nosci 100 podz. 24.1 33.1 28,3 38.6 32,4 23,4 23,4 Po obróbce na zimno z red. 16% i wyzarzone (l/2-1316°C) napr. 48,26 48,26 48,26 48,26 48,26 41,37 48.26 zywot. 0,1 27,5 17,7 101,9 5,1 1,0 .8,6 wy¬ dluz. 8,8 0,0 1.2 2.4 4,1 1,6 3,2 1 Szacunkowej naprezenie dla zywot¬ nosci 100 godz. (MN/ma) 24,1 1 42,75 40 48.26 36,5 26.2 37,2 * Wszystkie naprezenia w MN/m2 Zywotnosc w godzinach Wydluzenie w %75 811 15 16 co najmniej 98% teoretycznej z ziarnami wydluzo¬ nymi o szerokosci 10—100 mikrometrów i dlugosci 50—2000 mikrometrów, które sa stale w tempera¬ turach do co najmniej 1310°C.
2. Stop wedlug zastrz. 1, znamienny tym, ze dys- persoid jest rozdzielony w produkcie w srednich odleglosciach miedzyczastkowych 50—250 nanome¬ trów.
3. Stop wedlug zastrz. 2, znamienny tym, ze sred¬ ni odstep miedzyczastkowy wynosi 66—180 mm.
4. Stop wedlug zastrz. 1, 2 lub 3, znamienny tym, ze zawiera wagowo 15—40% chromu, 0—5% ko¬ baltu, 0—6% niklu, 1—7% aluminium i 0—1% ty¬ tanu oraz objetosciowo 0,25—5% zaroodpornego dyspersoidu.
5. Sposób wytwarzania stopu wedlug zastrz. 1, za pomoca umacniania na goraco mechanicznie sto¬ pionego proszku stopowego, utworzonego prze^ me¬ chaniczne stapianie stopowej mieszaniny proszków, skladajacej sie wagowo z 10—40% chromu i/lub 1—10% aluminium, 0—10% niklu, 0—20% kobaltu, 0—5% tytanu, 0—2% kazdego metalu ziem rzad¬ kich, itru, cyrkonu, niobu, hafnu, tantalu, krzemu i/lub wanadu, 0—6% wolframu : molibdenu, 0—0,4% wegla, 0—0,4% manganu, reszta poza przypadkowy¬ mi skladnikami i zanieczyszczeniami stanowi ze¬ lazo oraz 0,1—10% objetosciowych zaroodpornego dyspersoidu o punkcie topliwosci co najmniej !500*C, znamienny tym, ze obrabia sie plastycznie sest£"*on:«' produkt w celu osiagniecia redukcji co n&jmr-iej rzedu 10% w temperaturze nie przekra¬ czajacej 930°C dla utrzymania odksztalcenia trwa¬ lego w obrobionym materiale \ nastepnie poddaje sie obrobiony material obróbce cieplnej majacej na celu rozrost ziarna.
6. Sposób wedlug zastrz. 5, znamienny tym, ze produkt zestalony poddaje sie obróbce w tempera- 5 turze nie przekraczajacej 870°C.
7. Sposób wedlug zastrz. 4 lub 5, znamienny tym, ze stosuje sie redukcje wynoszaca co najmniej 15%.
8. Sposób wedlug zastrz. 5—7, znamienny tym, ze stosuje sie redukcje wynoszaca co najmniej 25%.
9. Sposób wedlug zastrz. 5—8, znamienny tym, ze mechaniczne stopienie proszków stopowych prowa¬ dzi sie w atmosferze obojetnej.
10. Sposób wedlug zastrz. 9, znamienny tym, ze stosuje sie atmosfere obojetna skladajaca sie glów¬ nie z argonu.
11. Sposób wedlug zastrz. 5—10, znamienny tym, ze stosuje sie proszek zawierajacy co najmniej 3% aluminium.
12. Sposób wedlug zastrz. 5—11, znamienny tym, ze stosuje sie proszek zawierajacy 18—26% chro¬ mu. (3.
13. Sposób wedlug zastrz. 5—12, znamienny tym, ze'sake zaroodporny dyspersoid stosuje sie tlenek, wefclik, azotek i/lub borek metalu.
14. Sposób wedlug zastrz. 13, znamienny tym, ze jak zaroodporny dyspersoid stosuje sie tlenek toru, cyrkonu, hafnu, tytanu, uranu, magnezu, wap¬ nia, berylu i/lub aluminium, albo weglik, azotek i/lub borek toru, cyrkonu, hafnu i/lub tytanu.
15. Sposób wedlug zastrz. 5—12, znamienny tym, ze jako zaroodporny dyspersoid stosuje sie tlenek krzemu i/lub ziem rzadkich. 15 20 25 Prac. Poligraf, *JP PRL Naklad 120 + 18egz. Cena 10 zl PL PL
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21840472A | 1972-01-17 | 1972-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL75811B1 true PL75811B1 (pl) | 1974-12-31 |
Family
ID=22814974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL1972159957A PL75811B1 (pl) | 1972-01-17 | 1972-12-29 |
Country Status (19)
| Country | Link |
|---|---|
| US (1) | US3837930A (pl) |
| JP (1) | JPS5736343B2 (pl) |
| AT (1) | AT337230B (pl) |
| BE (1) | BE794142A (pl) |
| CA (1) | CA977587A (pl) |
| CH (1) | CH579636A5 (pl) |
| DD (1) | DD101582A5 (pl) |
| ES (1) | ES410670A1 (pl) |
| FR (1) | FR2168401B1 (pl) |
| GB (1) | GB1407867A (pl) |
| IE (1) | IE37465B1 (pl) |
| IL (1) | IL41195A (pl) |
| IT (1) | IT976876B (pl) |
| LU (1) | LU66828A1 (pl) |
| NL (1) | NL7300538A (pl) |
| PL (1) | PL75811B1 (pl) |
| RO (1) | RO67589A (pl) |
| SE (1) | SE389820B (pl) |
| ZA (1) | ZA73308B (pl) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075010A (en) * | 1976-02-05 | 1978-02-21 | The International Nickel Company, Inc. | Dispersion strengthened ferritic alloy for use in liquid-metal fast breeder reactors (LMFBRS) |
| US4111685A (en) * | 1976-11-04 | 1978-09-05 | Special Metals Corporation | Dispersion-strengthened cobalt-bearing metal |
| DE2838850C2 (de) * | 1978-09-06 | 1983-12-15 | Gränges Nyby AB, Nybybruk | Verfahren zum Herstellen kaltverformter Rohre aus auf pulvermetallurgischem Weg erzeugten stranggepreßten rostfreien Stahlrohren |
| DE3113886C2 (de) * | 1981-04-07 | 1983-01-20 | Eckart-Werke Standard-Bronzepulver-Werke Carl Eckart, 8510 Fürth | Verfahren zur Herstellung eines Metall- oder Metallegierungspulvers |
| US4391634A (en) * | 1982-03-01 | 1983-07-05 | Huntington Alloys, Inc. | Weldable oxide dispersion strengthened alloys |
| US4647304A (en) * | 1983-08-17 | 1987-03-03 | Exxon Research And Engineering Company | Method for producing dispersion strengthened metal powders |
| GB2156854B (en) * | 1984-04-06 | 1987-03-11 | Atomic Energy Authority Uk | Titanium nitride dispersion strengthened alloys |
| JPS61173758U (pl) * | 1985-04-17 | 1986-10-29 | ||
| US4627959A (en) * | 1985-06-18 | 1986-12-09 | Inco Alloys International, Inc. | Production of mechanically alloyed powder |
| GB2181454B (en) * | 1985-10-10 | 1990-04-04 | Atomic Energy Authority Uk | Processing of high temperature alloys |
| US4732622A (en) * | 1985-10-10 | 1988-03-22 | United Kingdom Atomic Energy Authority | Processing of high temperature alloys |
| US5209772A (en) * | 1986-08-18 | 1993-05-11 | Inco Alloys International, Inc. | Dispersion strengthened alloy |
| AU600009B2 (en) * | 1986-08-18 | 1990-08-02 | Inco Alloys International Inc. | Dispersion strengthened alloy |
| DE3714239C2 (de) * | 1987-04-29 | 1996-05-15 | Krupp Ag Hoesch Krupp | Verfahren zur Herstellung eines Werkstoffs mit einem Gefüge nanokristalliner Struktur |
| US5002834A (en) * | 1988-04-01 | 1991-03-26 | Inco Alloys International, Inc. | Oxidation resistant alloy |
| JP2579393B2 (ja) * | 1990-09-12 | 1997-02-05 | 川崎製鉄株式会社 | 耐酸化性の優れたＦｅ−Ｃｒ−Ａｌ系急冷合金箔 |
| US5167728A (en) * | 1991-04-24 | 1992-12-01 | Inco Alloys International, Inc. | Controlled grain size for ods iron-base alloys |
| JP2777319B2 (ja) * | 1993-07-30 | 1998-07-16 | 財団法人電気磁気材料研究所 | 耐摩耗性高透磁率合金およびその製造法ならびに磁気記録再生ヘッド |
| AUPP042597A0 (en) * | 1997-11-17 | 1997-12-11 | Ceramic Fuel Cells Limited | A heat resistant steel |
| DE10025108A1 (de) * | 2000-05-20 | 2001-11-29 | Forschungszentrum Juelich Gmbh | Hochtemperaturwerkstoff |
| AT4737U1 (de) * | 2001-01-15 | 2001-11-26 | Plansee Ag | Pulvermetallurgisches verfahren zur herstellung hochdichter formteile |
| JP3741654B2 (ja) * | 2002-02-28 | 2006-02-01 | Ｊｆｅスチール株式会社 | 高密度鉄基鍛造部品の製造方法 |
| AU2003283525A1 (en) * | 2002-11-04 | 2004-06-07 | Doncasters Limited | High temperature resistant alloys |
| GB2394959A (en) * | 2002-11-04 | 2004-05-12 | Doncasters Ltd | Hafnium particle dispersion hardened nickel-chromium-iron alloys |
| JP5262423B2 (ja) * | 2008-08-21 | 2013-08-14 | セイコーインスツル株式会社 | ゴルフクラブヘッド、そのフェース部及びその製造方法 |
| JP5585237B2 (ja) * | 2010-06-24 | 2014-09-10 | セイコーエプソン株式会社 | 粉末冶金用金属粉末および焼結体 |
| JP5585572B2 (ja) * | 2011-12-13 | 2014-09-10 | セイコーエプソン株式会社 | 粉末冶金用金属粉末および焼結体 |
| JP5630430B2 (ja) * | 2011-12-13 | 2014-11-26 | セイコーエプソン株式会社 | 粉末冶金用金属粉末および焼結体 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2409797A (en) * | 1943-06-08 | 1946-10-22 | Kanthal Ab | Machinable alloy for high temperature use |
| GB611515A (en) * | 1945-03-10 | 1948-11-01 | Kanthal Ab | An improved heat-resisting machinable alloy for use as electric resistance material for high temperatures as well as for manufacturing details of construction exposed to high temperatures |
| US3159908A (en) * | 1963-02-26 | 1964-12-08 | Du Pont | Dispersion hardened metal product and process |
| US3346427A (en) * | 1964-11-10 | 1967-10-10 | Du Pont | Dispersion hardened metal sheet and process |
| US3366515A (en) * | 1965-03-19 | 1968-01-30 | Sherritt Gordon Mines Ltd | Working cycle for dispersion strengthened materials |
| US3368883A (en) * | 1965-07-29 | 1968-02-13 | Du Pont | Dispersion-modified cobalt and/or nickel alloy containing anisodiametric grains |
| FR1504716A (fr) * | 1966-10-25 | 1967-12-08 | Johnson Matthey & Company | Perfectionnements apportés aux traitements des métaux et des alliages |
| US3591365A (en) * | 1969-01-16 | 1971-07-06 | Santoku Metal Ind | Heat resisting corrosion resisting iron chromium alloy |
| FR2057562A5 (pl) * | 1969-08-27 | 1971-05-21 | Int Nickel Ltd |
-
0
- BE BE794142D patent/BE794142A/xx unknown
-
1972
- 1972-10-18 CA CA154,247A patent/CA977587A/en not_active Expired
- 1972-12-22 JP JP12833372A patent/JPS5736343B2/ja not_active Expired
- 1972-12-27 IL IL41195A patent/IL41195A/xx unknown
- 1972-12-29 PL PL1972159957A patent/PL75811B1/pl unknown
-
1973
- 1973-01-11 RO RO7373452A patent/RO67589A/ro unknown
- 1973-01-12 NL NL7300538A patent/NL7300538A/xx not_active Application Discontinuation
- 1973-01-15 LU LU66828A patent/LU66828A1/xx unknown
- 1973-01-15 GB GB208373A patent/GB1407867A/en not_active Expired
- 1973-01-15 IT IT47678/73A patent/IT976876B/it active
- 1973-01-16 DD DD168275A patent/DD101582A5/xx unknown
- 1973-01-16 CH CH57673A patent/CH579636A5/xx not_active IP Right Cessation
- 1973-01-16 ES ES410670A patent/ES410670A1/es not_active Expired
- 1973-01-16 ZA ZA730308A patent/ZA73308B/xx unknown
- 1973-01-16 SE SE7300549A patent/SE389820B/xx unknown
- 1973-01-16 IE IE67/73A patent/IE37465B1/xx unknown
- 1973-01-16 AT AT34373A patent/AT337230B/de not_active IP Right Cessation
- 1973-01-16 FR FR7301461A patent/FR2168401B1/fr not_active Expired
- 1973-01-22 US US00325313A patent/US3837930A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IE37465L (en) | 1973-07-17 |
| JPS5736343B2 (pl) | 1982-08-03 |
| BE794142A (fr) | 1973-07-17 |
| FR2168401B1 (pl) | 1977-02-04 |
| ES410670A1 (es) | 1976-01-01 |
| CA977587A (en) | 1975-11-11 |
| IE37465B1 (en) | 1977-08-03 |
| SE389820B (sv) | 1976-11-22 |
| IT976876B (it) | 1974-09-10 |
| AT337230B (de) | 1977-06-27 |
| FR2168401A1 (pl) | 1973-08-31 |
| JPS4881713A (pl) | 1973-11-01 |
| DE2301137B2 (de) | 1976-03-25 |
| CH579636A5 (pl) | 1976-09-15 |
| LU66828A1 (pl) | 1973-07-24 |
| US3837930A (en) | 1974-09-24 |
| NL7300538A (pl) | 1973-07-19 |
| GB1407867A (en) | 1975-09-24 |
| IL41195A0 (en) | 1973-02-28 |
| DD101582A5 (pl) | 1973-11-12 |
| IL41195A (en) | 1975-10-15 |
| ZA73308B (en) | 1973-11-28 |
| RO67589A (ro) | 1982-05-10 |
| DE2301137A1 (de) | 1973-08-16 |
| ATA34373A (de) | 1976-10-15 |
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