PL17798B3

PL17798B3 - Aluminum alloy.

Info

Publication number: PL17798B3
Application number: PL17798A
Authority: PL
Filing date: 1931-03-31
Publication date: 1933-02-28

Description

Najdluzszy czas trwania patentu do l8_listopada 1947 r- Wynalazek niniejszy stanowi dalsza od¬ miane wynalazku wedlug patentu Nr 17487.Doswiadczenia wykazaly, ze w odle¬ wach o skladzie opisanym w patencie Nr 17487, moze sie zdarzyc lokalne oslabienie albo zmniejszenie jednolitej wytrzymalo¬ sci. Takie oslabienie albo skaza w jednoli¬ tej wytrzymalosci spowodwana jest utle¬ nianiem, jakie moze nastapic podczas pro¬ cesu stapiania, albo podczas wlewania sto¬ pu do formy. Moze ono nastapic tern la¬ twiej, im dluzej z jakiegokolwiek badz po¬ wodu stop znajduje sie w stanie cieklym, a taikze moze byc spotegowane w zaleznosci od pewnego ksztaltu formy, skutkiem cze¬ go moze sie ujawnic lokalne wytworzenie piany. Takie spienienie lub utlenienie moz¬ na znacznie oslabic dodajac do stopu, be¬ dacego jeszcze w stanie cieklym, niewielka ilosc cynku, nieprzekraczajaca 5%, lecz nie mniejsza niz 0,01% w stosunku do wagi ca¬ lego stopu. Najlepiej dodawac cynk pod koniec trzpienia bezposrednio przed wla¬ niem stopu do formy, przyczem jednak pewna ilosc cynku bedzie stracona. W przy¬ padku odlewania stopu najpierw w for¬ mach blokowych, z których odlewy nastep¬ nie przetapia sie ponownie i wlewa do form, o ksztalcie zadanym do celów uzytko¬ wych, mozna cynk dodawac podczas pierw¬ szego albo drugiego odlewania. W razie do¬ dawania go w pierwszym zabiegu, cynk tennie zostanie stracony w znaczniejszym stop¬ niu podczas drugiego z tych zabiegów. PLThe longest term of the patent until November 18, 1947 - The present invention is a further variation of the invention according to patent No. 17487. Experience has shown that in castings with the composition described in patent No. 17487, there may be a local weakening or a reduction in uniform strength. This weakening or flaw in uniform strength is due to oxidation which may occur during the fusing process or when pouring the alloy into the mold. This may occur more easily the longer the melt is in a liquid state for any or any reason, and this may be aggravated depending on a certain shape of the mold, as a result of which local foam formation may be revealed. This foaming or oxidation can be greatly reduced by adding a small amount of zinc to the alloy while it is still liquid, not exceeding 5% but not less than 0.01% by weight of the total alloy. It is best to add zinc at the end of the mandrel just before pouring the alloy into the mold, but some zinc will be lost. In the case of casting the alloy first in block molds, from which the castings are then remelted and poured into molds of a desired shape for commercial purposes, the zinc may be added during the first or second casting. If added in the first treatment, this zinc will not be lost much during the second treatment. PL

Claims

1. Patent claim. An aluminum alloy with the composition according to Patent No. 17487f, characterized by the fact that a certain amount of zinc is added to this alloy, while still in a liquid state, not exceeding 5% but not less than 0.01% of the weight of the whole alloy, including zinc replaces appropriate quantity of aluminum, Rolls-Royce Limited. Deputy: L Myszczynski, patent attorney. Printing by L. Boguslawski and Ski, Warsaw. PL