초록 ▼

When bearing layers are producing by thermal coating the coating flame causes oxidation of a part of the coating material. To reduce this oxide formation and especially to lower the formation of oxide clusters in the layer a gas stream is projected next to the burner flame with an oxygen content low

When bearing layers are producing by thermal coating the coating flame causes oxidation of a part of the coating material. To reduce this oxide formation and especially to lower the formation of oxide clusters in the layer a gas stream is projected next to the burner flame with an oxygen content lower than that of air. Preferably a gas with nitrogen ≥99% is used for the gas stream and as cooling gas for the burner. The method disclosed provides a bearing layer for a connecting rod eye. The large connecting rod eye is subjected to pre-spindle trimming, cracking and further spindle trimming to the coating tolerance, sandblasted and plasma coated with an aluminum bronze to produce a microporous layer. At the start of plasma spraying the plasma layer is deposited at a high temperature, which results in good adhesion of the plasma layer to the material of the connecting rod eye and low porosity of the plasma layer. To prevent annealing of the material of the connecting rod eye, the deposit temperature of the plasma layer is reduced during deposition of material which is removed by subsequent machining of the bearing layer. After plasma coating the connecting rod eye is opened by removing the bearing cap, which ruptures the bearing layer. The cap is then remounted and the final bearing surface is formed by fine spindle trimming. To improve the oil retention volume the bearing layer has an annular groove.

대표청구항 ▼

1. A method for the thermal coating of an interior surface comprising:applying an oxidizable coating material with a rotating flame from a burner to a surface to be coated; and supplying a nonflammable gas stream having an oxygen content less than 18 percent by volume in flanking relation to the fla

1. A method for the thermal coating of an interior surface comprising:applying an oxidizable coating material with a rotating flame from a burner to a surface to be coated; and supplying a nonflammable gas stream having an oxygen content less than 18 percent by volume in flanking relation to the flame from rows of gas discharge openings laterally spaced from the flame on opposite sides in the direction of rotation of the flame to direct the flame toward the surface to be coated during rapid motion of the flame so that the oxidizable coating material is heated by the flame, directed by the nonflammable gas stream toward the surface to be coated and deposited in a layer on the interior surface with a reduced quantity of oxide to provide a reduced porosity in comparison with a gas stream consisting of air while reducing the effects of microturbulence within the flame.