Kingdream Public Ltd. Co.

Wuhan Hydrogen Energy and Fuel Cell Industry Technology Research Institute Co., Ltd.

Sinopec Oilfield Equipment Corporation

Valeo Vision

Qiang Liu

Feng Cheng

Lingfeng Gao

Tianshu Liao

Jianan Wang

Guanfu Tu

Yunyun Xiang

Yujuan Zhu

A multi-cutting-edge diamond composite includes a columnar hard alloy substrate and a diamond composite layer, the diamond composite layer being disposed at a top end of the hard alloy substrate, wherein a circumferential edge of a top end of the diamond composite layer is provided with at least two segments of different chamfers to form different cutting edges. By providing different chamfers on the circumferential edge of the top end of the diamond composite layer, multiple cutting edges are formed in the circumferential direction of an end face of the diamond composite, such that different edges of the same composite sheet have different attacking abilities and impact resistance abilities. Since the chamfers form various cutting edges with different properties, the same diamond composite can meet the requirement of drilling in different strata, and can enable a diamond drill bit to adapt to the requirement of drilling in complex strata.

Multi-cutting-edge diamond composites and earth-boring tools

Disclosed is a membrane electrode, fuel cell gas diffusion layer, and process for preparing the fuel cell gas diffusion layer, the process comprising: S1 coating microporous layer slurry on the surface of hydrophobic carbon paper; the microporous layer slurry was obtained by dispersing mixture of carbon powder, polytetrafluoroethylene dispersion solution, thickener, and solvent; S2 moving the hydrophobic carbon paper coated with the microporous layer slurry to a porous ceramic plate, and connecting a vacuum pump to the porous ceramic plate, vacuumed for adsorption pre-infiltration treatment, and then dried. S3 continuing to coat the microporous layer slurry on the hydrophobic carbon paper dried in step S2, then drying, and then sintering at 250-400&#xb0; C. to obtain a gas diffusion layer. The beneficial effects of this disclosure include: this disclosure improve the water vapor erosion resistance of the microporous layer and the durability of the gas diffusion layer.

Membrane electrode, fuel cell gas diffusion layer and process for preparing the fuel cell gas diffusion layer

Growing community of inventors

Wuhan, China

Qiang Liu