Microstructure performance enhancement of Si₃N₄ reinforced laser clad KF110 base composite coatings

Abstract

The KF110-Si 3 N 4 -La 2 O 3 -Cu composite coatings were fabricated on TA2 by a laser cladding (LC). Microstructure, elemental distribution, high temperature oxidation, and wear resistance were investigated. Research results showed that the nanocrystalline phases (NPs) and the amorphous phases (APs) were formed due to the existence of the short atomic radius elements/fast cooling rate during an LC process; the uniform distributed NPs with the high interface energy were produced due to an addition of Cu, enhancing wear resistance of an LC coating. Lattice distortions were produced due to high temperature of a laserinduced pool (LIP). Addition of the alloy elements enhanced high temperature oxidation resistance of this coating. Excessive addition of Si 3 N 4 caused defects to be produced, enhancing the brittleness of this coating.

High-Temperature Oxidation Properties of Ti-Hf-Mo-Ta-Nb-B Composite Coating Deposited on Ti60 Alloy with Laser Cladding

“…It can be seen from the above that the highest temperature of the high-temperature anti-oxidation coating prepared on Ti60 alloy reported in the literature does not exceed 900 • C, and although there are many literature reports [8][9][10][11][12] on the preparation of hightemperature oxidation-resistant coatings on the surface of different titanium alloys, such as TA2 [8], TA15 [9] and TC4 [10][11][12], using laser cladding, there is no literature report on the preparation of high-temperature anti-oxidation coating resistant to 1100 • C on Ti60 alloy. The melting point of titanium is 1668 • C, the boiling point is 3260 • C, and the density is 4.5 g/cm 3 , which has a wide range of uses in the aerospace field.…”

Microstructure and Mechanical Properties of GH4169 Superalloy and Si3N4 Ceramic Joints Brazed with AgCuTi/Cu foam/AgCuTi Composited Filler

“…It has been used in wide engineering applications, such as missile radome, satellite antenna, and aerospace [2,3]. However, the inherent brittleness and poor machinability of Si 3 N 4 ceramics limit its application [4][5][6]. Joining Si 3 N 4 ceramics with metal materials to form composites is an effective method to manufacture complicated component [7,8].…”