Abstract: The invention belongs to the technical field of metal ceramics, in particular to a metal ceramic and a preparation method thereof. The hard phase is formed by at least four kinds of crystal grains with different compositions and shapes; and in the scanning electron microscope photograph of the metal ceramic, it can be observed the first hard phase comprising black titanium nitrocarbide, a thin ring and a thick ring wherein the core phase is pure black; the second hard phase in the form of a dark gray core-ring structure particles; the third hard phase in the form of a high-brightness white core-gray ring; and the fourth hard phase in the form of a homogenous gray phase and off-white core-gray ring structure particles. In addition, a white binder phase can also be observed, and the binder phase is at least one of cobalt and nickel.

Abstract: Roughly described, the invention involves detecting the presence of features on the boundary mesh which are likely to hamper regeneration of a bulk mesh with high quality elements, and upon finding such features, performing a repair operation on the boundary mesh prior to bulk mesh regeneration. The repair operation can include smoothing knife edge features and/or handling topological changes that have occurred during the simulation time increment. Preferably the repair operation includes a multi-level set smoothing step and a Delaunay refinement step for piecewise smooth complex.