PL35781B1

PL35781B1 -

Info

Publication number: PL35781B1
Application number: PL35781A
Authority: PL
Filing date: 1949-08-05
Publication date: 1953-02-28

Description

pierwszenstwo: 16 wrzesnia 1948 r. (Czechoslowacja) Najczesciej dotychczas uzywanym energicznym i stalym srodkiem do naweglania stali jest mie¬ szanka, zawierajaca weglan baru. Ujemna cecha takiej mieszanki jest to, ze podczas transportu jej czesci skladowe latwo ulegaja rozdzielaniu wskutek ich róznych ciezarów wlasciwych.Próby przeprowadzone z szeregiem innych srodków naweglajacych, jak zywice, cyjanki al¬ kaliczne, weglany metali alkalicznych itd., -wy¬ kazaly, ze stalosc srodków tych mieszanek wcale nie dorównuje stalosci mieszanek z weglanem baru. Ich strona ujemna jest, ze trawia nawet gladkie powierzchnie metalowe, niszcza skrzynie do naweglania i nie daja sie regenerowac.Jako nader skuteczny stabilizator srodków na¬ weglajacych znany jest weglan sodu. Mieszanki zawierajace weglan sodu dzialaja bardzo szybko i stale, zwlaszcza przy jego zawartosci 8—8$%.Mieszanka taka powoduje jednak uszkodzenie przedmiotów naweglanych przez wytrawianie ich powierzchni.Stwierdzono, ze mozna uzyskac srodki nawe- glajace, dzialajace energicznie i równomiernie, o charakterze trwalym, nawet przy uzyciu ich do powtórnego naweglania bez regeneracji. Uzyskuje sie je przez nasycanie wegla drzewnego roztwo¬ rem weglanu sodu o takim stezeniu, aby jego za¬ wartosc w weglu drzewnym po wysuszeniu wy¬ nosila 2,5—3%. Nastepnie mieszanke taka po wy¬ suszeniu spryskuje sie roztworem mrówczanu, zawierajacego bar i wapno, przy czym stosunek zawartosci w tym roztworze tlenków baru i wapnia wynosi najkorzystniej 4:1 do 3:2. Przez to uzyskuje sie srodek naweglajacy, który nie trawi naweglanej powierzchni i nawegla ja rów¬ nomiernie, nawet przy powtórnym naweglaniu bez jakiejkolwiek regeneracji.Przyklad. 30 g bezwodnego weglanu sodu rozpuszcza sie w 400 cm3 wody i tym rozczynem nasyca sie 970 g wegla drzewnego, odpowiednio rozdrobnionego. Po wysuszeniu tak nasyconego wegla drzewnego spryskuje sie go nasyconymroztworem mrówczanu baru i wapnia o zawarto- PLpriority: September 16, 1948 (Czechoslovakia) The most frequently used energetic and constant medium for carburizing steel is a mixture containing barium carbonate. The disadvantage of such a mixture is that during transport its constituent parts are easily separated due to their different specific weights. Tests carried out with a number of other carburizing agents, such as resins, alkali cyanides, alkali metal carbonates, etc., have shown that The consistency of these blends is not at all equal to that of blends with barium carbonate. Their disadvantage is that it etches even smooth metal surfaces, destroys the carburizing boxes and cannot be regenerated. Sodium carbonate is known as a very effective stabilizer of carbonates. Mixtures containing sodium carbonate work very quickly and continuously, especially with its content of 8-8 $%. Such a mixture, however, causes damage to carburized objects by etching their surface. It has been found that it is possible to obtain carburizing agents that act vigorously and evenly, even when used for re-carburization without regeneration. They are obtained by impregnating charcoal with a sodium carbonate solution of such a concentration that its content in charcoal after drying is 2.5-3%. After drying, the mixture is then sprayed with a barium-lime-formate solution, the ratio of barium oxides to calcium in this solution being most preferably 4: 1 to 3: 2. As a result, a carburizing agent is obtained which does not etch the carburized surface and carries it evenly, even with a second carburization without any regeneration. 30 g of anhydrous sodium carbonate are dissolved in 400 cm3 of water and 970 g of suitably ground charcoal is saturated with this solution. After the saturated charcoal has dried, it is sprinkled with a saturated solution of barium formate and calcium containing PL

Claims

1. Claim sei barium oxide and calcium oxide in a 4: 1 ratio. When carburizing with this agent, C38 steel. Surface carburizing agent for steel, it was found that after 4 hours. carburizing in the area, characterized by the fact that it is charcoal at a temperature of 880 ° C, the thickness of the carburized layer, suitably crushed and saturated with the solution, was 1.2 mm, with the content of sodium carbonate at such a concentration that the content in the layer was 1%, and the hardness her 66 sodium carbonate in charcoal after drying Rockwell debt. Under the same conditions, it was 2.5-3%, and the carbonization of the carbon steel CE4 after drying the carburization, it was found that the carbon thickness additionally with barium formate and calcium of the carburized layer was 0.9 mm and the total ratio of barium oxide to calcium oxide was quite 65 According to Rockwell, with a content of preferably 4: 1 to 3: 2. 1.04% gla. In no case was there any damage or damage to the carbon surface and the toughening of the carburized surface or the carburizing boxes. Deputy: Collegium of Patent Attorneys "Press" St-gród. 4705 - 18. 8. 53 - R-4-33541 - BI bezdrz. 100 g. - 150 PL