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Developing disc-brake pair materials with better performances is a key technique for thedisc brake of drilling rig. Screening experiments were carried out with five different brake-disc ma-terials in pair with two different brake-block materials. The frictional coefficient along with the cor-responding steady coefficient and fluctuating coefficient as well as the wear rate have been dis-cussed. Some conclusions have been achieved: (1) Between the two different cladding materialsbuilt-up on the steel 20~＃ and 35~＃ as brake-disc materials, the overall tribological behaviour of theone is better than that of the other. (2) Between the two brake-block composites, the one is betterthan the other. (3) Among these brake pair materials, the tribological behaviours of the second kindof brake-block composite in pair with the second build-up welding material are much better thanthat of the others, therefore, these materials can be selected preliminarily to use in disc brake fordrilling rig.
Developing disc-brake pair materials with better performances is a key technique for the disc brake of drilling rig. Screening experiments were carried out with five different brake-disc maters in pair with two different brake-block materials. The frictional coefficient along with the cor-responding steady coefficient and fluctuating coefficient as well as the wear rate have been dis-cussed. Some conclusions have been achieved: (1) Between the two different cladding materials built-up on the steel 20 ~ # and 35 ~ # as brake- disc materials, the overall tribological behavior of theone is better than that of the other. (2) Between the two brake-block composites, the one is betterthan the other. kindof brake-block composite in pair with the second build-up welding material are much better thanthat of the others, therefore, these materials can be selected preliminarily to use in disc brake for drilling rig.