Wear-resistant ceramic tiles, ceramic sheets and ceramic bricks in the nature of shapes and for lining and facing apparatus and installations for transporting and holding abrasive materials; alumina and zirconia ceramics in the form pipe inlets, shaped components or thin tiles for lining of pipes and other parts of industrial plants exposed to abrasive fluids or abrasive bulk solids or to high temperature for enhancing the wear resistance of such pipes and parts of industrial plants