Bo Ren

Abstract: Through the first principles calculations, the chemical stability, mechanical, and electronic properties of chromium silicides are predicted. Estimating enthalpies and binding energies, density state density and electron density distribution are combined to analyse the thermodynamic stability and physical properties of chrome-silicon binary compounds. The chromium silicide includes Cr3Si, Cr5Si3, CrSi, and CrSi2. The chemical stability and the information about electronic structure, mechanical properties, Debye temperature, and anisotropy properties are obtained by density functional theory and Debye quasi-harmonic approximation. Meanwhile, the calculation of elastic modulus shows that Cr3Si has the highest body modulus value (251 GPa) and CrSi2 possesses the highest shear modulus (169.5 GPa) and Young’s modulus (394.9 GPa). In addition, the Debye temperature and the speed of sound of these Cr–Si compounds are also calculated. Since the calculated bulk modulus is different from Young’s modulus anisotropy index, and also different from Young’s modulus of a three-dimensional surface shape, the different mechanical anisotropies of all the compounds are obtained.

TL;DR: In this paper, a method for preparing a complex-shape composite material hot-working mold through 3D printing is described. But the method is not suitable for mold fabrication and it cannot be applied to mold fabrication with complex shape.

TL;DR: In this article, a method for preparing a stereoscopic net-shaped space structure composite through 3D printing is presented, where the composite and a 3D printer are combined, thus technological operation is easy, the prepared space structure is precise, subsequent machining is not needed, and the defect that as for a traditional casting method, subsequent surface machining was difficult is overcome.