PL96070B1

PL96070B1 - METHOD OF MAKING METAL POWDER COATINGS ON IRON ALLOY CASTINGS

Info

Publication number: PL96070B1
Application number: PL17951275A
Authority: PL
Priority date: 1975-04-10
Filing date: 1975-04-10
Publication date: 1977-12-31

Description

Przedmiotem wynalazku jest sposób wytwarza¬ nia powlok z proszków metali na odlewach ze stopów zelaza.The invention relates to a manufacturing process metal powder coatings on stainless steel castings iron alloys.

Znany jest sposób wytwarzania powlok ochron¬ nych na odlewach ze stopów zelaza polegajacy na napawaniu lub napylaniu na odlew sproszko¬ wanego metalu przeznaczonego na powloke. Spo¬ sób ten wymaga wstepnego przygotowania po¬ wierzchni odlewu przed przystapieniem do nakla¬ dania powloki, powoduje powiekszenie wymiarów odlewu o grubosc naniesionej powloki, oraz nie daje mozliwosci nanoszenia powlok w miejscach trudno dostepnych, na przyklad odwzorowywa¬ nych rdzeniami odlewniczymi.There is a known method of producing protective coatings on castings of iron alloys consisting of on padding or powder coating on casting important metal for the coating. Spo this man requires pre-treatment the surface of the casting before sticking given the coating, increases the dimensions the casting with the thickness of the applied coating, and not gives the possibility of applying coatings in places difficult to access, for example, imitating foundry cores.

Sposób wytwarzania powlok wedlug wynalazku polega na napyleniu ogniowo-proszkowym, palni¬ kiem gazowym, na przyklad acetylenowo-tlenowym powierzchni formy odlewniczej lub rdzenia odlew¬ niczego proszkami metalu lub sproszkowanymi zwiazkami metali z niemetalami przeznaczonymi na powloke i nastepnym zalaniu tak przygotowa¬ nej formy cieklym metalem.Method for the production of coatings according to the invention it consists in powder spraying, combustion gas, for example oxy-acetylene the surface of the casting mold or the casting core anything with metal powders or powders metal compounds with intended non-metals on the coating and the next flooding so prepare form with liquid metal.

Wskutek dzialania cieklego metalu napylona na forme lub rdzen warstwa zostaje polaczona z od¬ lewem. Charakterystyczna cecha tej metody jest to, ze nawet w przypadku gdy warstwa nie zosta¬ je calkowicie przetopiona przez ciekly metal, zos¬ taje w calosci polaczona z odlewem. Wynika to z polaczenia sie ziarn proszku juz podczas procesu napylania.As a result of the action of liquid metal, it is sprayed onto the mold or core layer is joined with the odor the left. A distinctive feature of this method is that even if the layer did not remain them completely smelted by liquid metal, gold thay is completely bonded to the casting. This is due to the powder grains merge during the process sputtering.

Zaleta sposobu wedlug wynalazku jest mozli¬ wosc uzyskiwania powloki w miejscach trudno dostepnych, zgodnosc wymiarowa odlewu, stoso¬ wanie proszków metali bez dodatkowych spoiw ceramicznych, mala grozba wyplukania pokrycia formy przez ciekly metal, oraz silne polaczenie powloki ze stopem podloza.An advantage of the method according to the invention is possible it's hard to get coating in places available, dimensional accuracy of the casting, use metal powders without additional binders ceramics, a small risk of washing out the cover forms through liquid metal, and a strong bond coating with a base alloy.

Przyklad I. Przy pomocy palnika acetyle¬ nowo-tlenowego do napylania ogniowo-proszkowego napylano powierzchnie formy wykonanej z masy syntetycznej na osnowie mulitu ze spoiwem za¬ wierajacym zhydrolizowany krzemian etylu, prosz¬ kiem o nastepujacym skladzie Fe 1,5%, Cr — 27%, C — 0,5%, B — 3,2%, W — 13%, Si — 3,3%, Co — reszta. Tak przygotowana forme zalewano zeliwem szarym. Uzyskano w ten sposób powloke o gru¬ bosci rzedu 1 mm oraz twardosci 53 HRC.Example I. Using an acetyl burner new oxygen for powder spraying the surfaces of the mold made of sand were sprayed mullite based synthetic material with a bonding agent containing hydrolyzed ethyl silicate, powder with the following composition: Fe 1.5%, Cr - 27%, C - 0.5%, B - 3.2%, W - 13%, Si - 3.3%, Co - rest. The mold prepared in this way was poured with cast iron gray. In this way, a coating thickness of of 1 mm row and a hardness of 53 HRC.

Przyklad II. Postepowano jak w przyklactzie I z tym, ze zastosowano proszek o skladzie: 2° Sn — 7%, B — 1%, Cu — reszta. Uzyskano po¬ wloke z metalu uzytych proszków o grubosci okolo 0,7 mm, oraz zaobserwowanor efekt -mod^ikacji zeliwa przy pomocy miedzi na glebokosci okolo 3 mm. Example II. The procedure was as in the case And with the fact that a powder was used with the following composition: 2 ° Sn - 7%, B - 1%, Cu - the rest. Obtained metal thread used powders with a thickness of approx 0.7 mm, and a -modification effect was observed cast iron with the help of copper at a depth of about 3 mm.

Claims

Patent claims

A method of producing coatings from metal powders on castings of iron alloys, characterized in that the powdered metals are dusted by fire, by means of a gas flame on the surfaces of the mold or core, powdered metals with non-metals are sprayed by the foundry, The surface of the mold is covered with liquid metal by means of a fire with a gas burner. we or the casting core, then

2. The method according to claim A method as claimed in claim 1, characterized in that the cooked mold is poured with liquid metal. OZGraf. Order 90 (115 + 17 copies) Price PLN 45