WC particle was coated with TiC and Al2O3 particles using Co binding one by means of high-speed rotational blending to enhance the degree of mixing. Then the sintered composite material of WC-Co/TiC-Al2O3 was prepared, and the hot hardness was measured up to 800°C to be compared with conventional WC-Co alloy. It was found that the addition of TiC and Al2O3 components in the WC-Co alloy has a strong influence on the hot hardness. The hardness increased with higher amount of TiC from 5 up to 30 by weight percentage, whereas increasing Al2O3 additions reduced the hardness. Particularly, Al2O3 was effective due to its higher chemical stability than TiC at elevated temperature. Then, the highest hardness was obtained with addition of 30TiC-5Al2O3 by weight. This suggests that these materials can further be utilized for high temperature applications.