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A new graphene (G)/Al2O3 composite ceramic with tunable mechanics is prepared by direct ink writing (DIW) 3D‐printing technology. It is found that the bending strength, fracture toughness, and hardness all increase with increasing in content of G. The bending strength, fracture toughness, and hardness of G/Al2O3 composite ceramic (4.0 wt‰) are improved to be 45.0%, 40.6%, and 21.9% comparing to Al2O3 ceramic, respectively. The result is attributed to good reinforcement of G and inhibition of Al2O3 phase growth by G. Furthermore, the gear wheel with gradient mechanics is also designed and fabricated by the DIW 3D‐printing technology from various G/Al2O3 composite gels. It exhibits excellent wear resistance and low generation of heat during rotational friction. Herein, a new method is provided to fabricate G‐based ceramics with gradient structure and mechanics for various applications.

To predict the expansion and deformation of the sheet-metal hydraulic torque converter quickly and accurately, the model of torque converter flow field and torque converter housing is established and simplified by means of three coordinate measuring instrument and software UG in this paper. The hydraulic force and axial force of housing is computed by analyzing the flow model through Gambit and FLUEN software. Finally, the MSC.Patran and MSC.Nastran software are used to make simulation prediction for the ballooning deformation, and the results of the simulation were testified through the experiment. The experiment indicates that the simulation results basically complies with the experiment results. The axial displacement has a linear relation with the fluid pressure. The largest stress occurs near the intersect of the housing and working face, and the largest strain occurs at the outlet of the pump and inlet of the turbine.