Ti xNb 1-xN gradient coating exhibits better fracture toughness even though microhardness of the coating is high . The crack density β of the pre-nitrided coating is the lowest and the fracture toughness of the coating is the best .
TiXNb1-XN梯度膜具有较高膜层显微硬度，仍然具有较好的断裂韧度，预渗氮处理的膜层裂纹密度较小，膜层的断裂韧度最好。
xnb