SE190793C1

SE190793C1 -

Info

Publication number: SE190793C1
Authority: SE
Publication date: 1964-01-01

Description

Uppfinnare: R Marchal, R Chevalier och M Combecave Prioritet beglird frail den 1 september 1961 (Frankrike) Foreliggande uppfinning avser framstallning air en stralskarm air bly. Dylika stralskarmar aro avsedda att begransa rackvidden hos gammastralning i narheten av en. reaktorhard. Inventors: R Marchal, R Chevalier and M Combecave Priority beglird frail September 1, 1961 (France) The present invention relates to the manufacture of an air lead. Such beam frames are intended to limit the range of gamma radiation in the vicinity of one. reactor hard.

Foreliggande uppfinning avser i synnerhet stralskarmar av bly avsedda att anvandas runt reaktorharden hos en bassangreals.tor avsedd for studium av material under inverkan av straining. En dylik reaktor kan exempelvis vara forsedd med ett antal separata uppsattningsanordningar anordnode i narheten av harden pa sadant satt, att det organ eller det material, som skall undersokas, kan fastsattas i fastsattningsanordningen. En blyplat anordnas mellan harden och det undersokta organet eller materialet for att i sa hog grad som mojligt minska inverkan av gammastralning. In particular, the present invention relates to lead beams of lead intended for use around the reactor core of a pool reactor intended for the study of materials under the influence of straining. Such a reactor may, for example, be provided with a number of separate mounting devices arranged in the vicinity of the hardener in such a way that the means or material to be examined can be fixed in the fastening device. A lead plate is arranged between the hardener and the examined organ or material in order to reduce the effect of gamma radiation as much as possible.

For att skyddas mot korrosion maste dessa skarmar inneslutas i lattmetall, sasom aluminium eller aluminiumlegering. To protect against corrosion, these shields must be enclosed in light metal, such as aluminum or aluminum alloy.

Under inverkan av straining uppkommer en temperaturforhejning i blyet, varfor mamaterialet maste kylas genom ledning av Iran mineralamnen befriat vatten genom ror anordnade i sjalva skarmen eller i kanaler utformade av till skirmen svetsade korrugeringar. Under the influence of straining, a temperature rise occurs in the lead, so that the material must be cooled by the Iranian minerals liberated water through tubes arranged in the screen itself or in channels formed by corrugations welded to the screen.

Varmeutbytet mellan kylvattnet, blyet och det inneslutande materialet är tillfredsstallande endast mu vidhaftningen mellan blyet .och det for kapsling av skarmen anvanda materialet sakerstaller god varmeledning radian metallerna. The heat exchange between the cooling water, the lead and the enclosing material is satisfactory only if the adhesion between the lead and the material used for encapsulating the screen ensures good thermal conductivity of the radian metals.

Foreliggande uppfinning avser en blyskarm, vid vilken dessa olagenheter undvikas, saint forfarande for framstallning air denna skim. The present invention relates to a lead screen in which these imperfections are avoided, saint process for manufacturing this skim.

Uppfinningen avser salunda ett forfarande for framstallning av blyskarmar innekapsla de i lattmetall eller lattmetallegering. Det utmarkande for forfarandet är att en metallbelaggning ay ringa tjocklek omfattande minst ett metallskikt intimt fasthaftas pa innerytan av kapslingen, vid vilken blyet maste hafta, varefter den pa detta satt belagda an rengores med hjalp av flussmedel och blyet gjutes, sa att det kommer i beroring med na.mnda belaggning. The invention thus relates to a process for the production of lead frames encapsulated in light metal or light metal alloy. The distinguishing feature of the process is that a metal coating of small thickness comprising at least one metal layer is intimately adhered to the inner surface of the enclosure, to which the lead must adhere, after which the coated coating is cleaned by means of flux and the lead is cast so that it comes into contact with na.mnda coating.

Uppfinningen askadliggores narmare medelst bifogade ritning. Figuren pa ritningen visar en sektion ay en blyskarm enligt foreliggande uppfinning. The invention is further illustrated by the accompanying drawings. The figure in the drawing shows a section of a lead arm according to the present invention.

FOrfarandet enligt foreliggande uppfinning for framstallning av den pa figuren visade skarmen kannetecknas huvudsakligen daratt man anordnar en metallbelaggning av ringa tjocklek pa innerytan ay kapslingen, vilken belaggning kan besta av ett eller fler skikt, samt rengor innerytan ay den pa detta satt erhallna belaggningen medelst flussmedelsverkan, varefter man gjuter det bly, vilket inneslutet i kapslingen utbildar sjalva skarmen. The method according to the present invention for producing the screen shown in the figure can be characterized mainly by arranging a metal coating of small thickness on the inner surface of the enclosure, which coating may consist of one or more layers, and cleans the inner surface of the coating thus obtained by fluxing action. after which the lead is cast, which encloses the enclosure to form the screen itself.

Den metalliska belaggningen pa innerytan av kapslingen kan framstallas pa elektrolytisk eller kemisk vag eller genom doppning och kan besta ay ett enda skikt eller ett flertal metallskikt air olika. slag. The metallic coating on the inner surface of the enclosure can be produced by electrolytic or chemical vapor or by dipping and can consist of a single layer or a plurality of metal layers in different ways. kind.

Genom diffusion mellan skikten saint in i intilliggande material utbildar metallerna intermetalliska f8reningar, vilka mojliggora en tillfredsstallande forbindning mellan metallen i kapslingen och blyet. By diffusion between the layers saint into adjacent materials, the metals form intermetallic compounds, which enable a satisfactory connection between the metal in the enclosure and the lead.

Enligt en utforingsform av f8rfarandet enligt foreliggande uppfinning anordnar man tva pa varandra foljande skikt genom elektrolytisk utfallning, varvid ett skikt utglires ay koppar och det andra ay tenn. According to an embodiment of the method according to the present invention, two successive layers are arranged by electrolytic precipitation, one layer being smoothed on copper and the other on tin.

Enligt en annan utforingsform ay uppfin- 2— -- ningen utfaller man pa elektrolytisk vag ett skikt av koppar, ett skikt av nickel och ett skikt av tenn efter varandra. According to another embodiment of the invention, a layer of copper, a layer of nickel and a layer of tin are applied one after the other on an electrolytic scale.

Enligt en tredje utforingsform utfaller man forst ett skikt av nickel pa kemisk vag och utfaller darefter ett skikt av tenn pa elektrolytisk vag. According to a third embodiment, a layer of nickel is first precipitated on a chemical scale and then a layer of tin is precipitated on an electrolytic scale.

I samtliga dessa fall kan man ersatta den elektrolytiska utfallniugen med belaggning genom doppning. In all these cases, the electrolytic precipitate can be replaced by coating by dipping.

Enligt ytterligare en utforingsform utgores den metalliska belaggningen av ett enda sidckt av nickel som utfallts pa kemisk vag. According to a further embodiment, the metallic coating consists of a single side of nickel which has been chemically precipitated.

Om blyskarmen genomlopes av kylr8r, skola ytterytorna av dessa givetvis behandlas pa samma satt. If the lead frame is traversed by cooling pipes, the outer surfaces of these should of course be treated in the same way.

Vid den pa figuren visade utforingsformen belagges kapslingen 1 pa sin inneryta med en metallbelaggning erhallen enligt nagot av tillvagagangssatt, som angivits i det foregaende, varvid belaggningens tjocklek kan variera mellan 5 tusendelar och nagra hundradelar av 1 mm. Kapslingen ãr fylld med bly 2. In the embodiment shown in the figure, the housing 1 is coated on its inner surface with a metal coating obtained according to any of the procedures set forth above, the thickness of the coating being able to vary between 5 thousandths and a few hundredths of 1 mm. The housing is filled with lead 2.

En modifierad utforingsform av skarmen innefattar en kylslinga bestaende av ror 3 av lattmetall eller legering, vilka pa sin ytteryta är belagd med en metallbelaggning. A modified embodiment of the screen comprises a cooling loop consisting of tubes 3 of light metal or alloy, which on their outer surface are coated with a metal coating.

Enligt ytterligare en utforingsform är kapslingen 1 forsedd med korrugeringar 4, varvid kylvatten bringas att cirkulera i de av dessa utbildade kanalerna 5. According to a further embodiment, the enclosure 1 is provided with corrugations 4, whereby cooling water is caused to circulate in the channels 5 formed by these.

Forfarandet enligt foreliggande uppfinning gar det m5jligt att astadkomma god vidhaftning mellan blyet och den anvanda kapslingsmetallen, exempelvis aluminium eller aluminiumlegering, men man bar iakttaga vis:sa forsiktighetsatgarder under gjutningen av blyet. The process according to the present invention makes it possible to achieve good adhesion between the lead and the encapsulated metal used, for example aluminum or aluminum alloy, but certain precautions should be observed during the casting of the lead.

Om man vid framstallningen av blyskdrmen, vilken eventuellt kan vara f5rsedd med kylror av aluminium eller aluminiumlegering, ,endast ingj uter blyet i kapslingen saint melIan roren, varvid de ytor, som sta i beraring med blyet, tidigare belagts med en lamplig belaggning, kommer sammandragning av blymassan darefter att aga rum under kylningen, vilket pa grund av den ringa tjockleken hos belaggningen och den kraftiga temperaturgradienten mellan belaggningens hada ytor medlar en risk f6r deformering av skarmen .och bildning av mellanrum mellan blyet och kapslingens inneryta samt omkretsen av rOren, om icke vidhaftningen är i det narmaste perfekt. If, in the manufacture of the lead shield, which may be provided with aluminum or aluminum alloy tubes, the lead is only poured into the housing between the tubes, the surfaces which are in contact with the lead having previously been coated with a suitable coating, contraction will occur. of the lead mass then to take place during cooling, which due to the small thickness of the coating and the strong temperature gradient between the hot surfaces of the coating mediates a risk of deformation of the screen and formation of gaps between the lead and the inner surface of the enclosure and the circumference of the tube, if not the adhesion is almost perfect.

Genom att anvanda ett gjutningsforfarande benamnt 3.immersionsforfarandeb kan man undvika dessa eventuella olagenheter. By using a casting procedure called 3.immunity procedureb, one can avoid these possible irregularities.

Vid detta forfarande gjuter man, efter att ha belagt innerytan av kapslingen och periferin av kylraren med en lamplig bgaggning, blyet in i en form, i vilken kapslingen och roren anordnats i forvag. Blyet uppfyller alit tillgangligt utrymme, salunda aveu utrym met pa utsidan av kapslingen. Efter kylning erhalles ett kompakt block med ungefar tre ganger storre tjocklek an sjalva blyskarmen, vilken fullstandigt omslutes av blocket. Man avlagsnar darefter blyet fan skarmens hada andar, varef ten de ph skarmens bada sidor befintliga blyplatarna latt kunna avlagsnas, eftersom franvaron av en i forvag utbildad belaggning pa de yttre ytorna av kapsling forhindrar vidhaftning av blyet. In this process, after coating the inner surface of the casing and the periphery of the radiator with a suitable bending, the lead is cast into a mold in which the casing and the pipes are arranged in advance. The lead fills all available space, as well as space on the outside of the enclosure. After cooling, a compact block is obtained with a thickness approximately three times greater than the lead frame itself, which is completely enclosed by the block. The lead is then removed from the lead spirits of the screen, after which the lead plates existing on both sides of the screen can be removed, since the absence of a pre-formed coating on the outer surfaces of the enclosure prevents adhesion of the lead.

Claims

Patent claim:

1. - • -

Process for the manufacture of a lead screen encapsulated with a. slat metal or slat metal alloy, characterized in that a metal coating of small thickness consisting of at least one layer of metal is adhered to the inner surface of the casing to which the lead must be adhered, after which the coated surface is cleaned by fluxing action in this way arranged the coatings.

3. A method according to claim 1, characterized in that cooling tubes of light metal are arranged inside the lead frame in a certain relation to the enclosure and that their outer surfaces are subjected to the same treatment as the enclosure before the casting of the lead.

4. A method according to claim 1 or 2, characterized in that the enclosure and any other non-lead-containing parts of the screen are arranged in a mold, after which the lead is cast in this both inside and outside the enclosure and the excess lead is subsequently deposited.

5. A method according to any one of claims 1-3, characterized in that the coating consisting of one or more layers is deposited on an electrolytic path.

6. A method according to any one of claims 1-3, characterized in that the coating consisting of one or more layers is chemically precipitated.

A method according to any one of claims 1-3, characterized in that the coating consisting of one or more layers is achieved by dipping.

8. A method according to any one of claims 1-6, characterized in that the coating is obtained by peeling a first layer of copper and a second layer of tin.

9. A method according to any one of claims 1-6, characterized in that the coating is obtained by applying a first layer of copper, a second layer of nickel and a third layer of tin. 10. A method according to any one of claims 1-6, characterized in that the coating is obtained by applying a continuous layer of nickel and a second layer of tin.

10. A method according to claim 9, characterized in that the nickel layer is produced on a chemical scale and the tin layer is produced on an electrolytic scale. Request publications: