Abstract
A metal/ceramic graded composite for reducing the thermal stress generated across the jointed interface was fabricated by a hot-forging process. Powders of magnesium oxide mixed with SUS304 stainless steel in different ratios or the stack of the mixed powders having a stepwisely controlled compositional gradient from metal to ceramics were capsulated in a molybdenum mold with the dimension of 20φ-10φ×25hmm. The mold was preheated at 1250°C for 8 minutes, and was press-forged in a few seconds under an uniaxial compressive load. The deformation ratio of the mold was about 30% of the original height, and the maximum load was about 12ton.
By comparing some properties of the products with those of normally sintered materials, it was confirmed that the hot-forging process was effective to prepare the functionally gradient materials of metal-ceramics systems.
