Aviation exhaust nozzle multi-kinematic-pair abrasion test clamp device under high-temperature heavy-load low-speed working conditions

The invention provides a high-temperature heavy-load low-speed working condition aviation exhaust nozzle multi-kinematic-pair wear test clamp device. The clamp device comprises a clamp base and a lower clamp module which are installed at the two ends of a test workpiece respectively. The clamp base comprises a supporting seat and a replaceable clamping device detachably mounted on the supporting seat, the replaceable clamping device is rotationally connected with a test workpiece through a rotating shaft, and the lower clamp module is rotationally connected with the test workpiece through the rotating shaft or a ball head; crN-CrAlN coatings are arranged on the friction surfaces, making contact with the test workpiece, of the replaceable clamping device and the lower clamp module. The invention further discloses a preparation method of the CrN-CrAlN coatings. According to the wear test fixture device, the replaceable clamping device is adopted to meet the clamping requirements of test workpieces with differen