1990 Volume 8 Issue 4 Pages 450-456
Fusing treatment and press-sintering process of the thermal sprayed coatings have been applied conventionally to improve the wear properties of the ocating. However, it is restricted in application in spite of many advantages of this coating caused by the lack of fundamental data. The purpose of this investigation is to examine the effect of the strengthening treatment on the wear resistance of thermally sprayed Nickel-base self-fluxing alloy. Two strengthening treatments were conducted to sprayed coatings, namely, normal fusing treatment and press-sintering treatment. Dry-sliding wear test were carried out under the conditions of the four types of final load. The wear resistance of each specimen was evaluated by the specific wear which was obtained by measuring the wear trace's width.
The results obtained are summarized as follows:
1) An adequate correlation was observed between wear resistance of sprayed coating and both porosity in the coating and macro hardness of the coating, that is, wear resistance was improved by decreasing the porosity and by increasing the macro hardness, respectively.
2) The strengthening treatment to the coating was effective to decrease the porosity and to increase the macro hardness. The change of these factors suggests that it is important to strengthen the cohesion of particles deposited to improve the wear resistance of the coating.