Functionally graded material shape and method for producing such a shape

Abstract

The invention relates to a functionally graded material shape (1) where a first material (M1) is fused with a second material (M2) through sintering and a method of production of said functionally graded material shape (1). Said first material (M1) has a first coefficient of thermal expansion ([alpha]1) and said second material (M2) has a second coefficient of thermal expansion ([alpha]2), differing from the first coefficient of thermal expansion ([alpha]1). The invention is characterized in that the shape (1) further comprises a third material (M3) adapted to, together with M1 and M2, create an intermediate composite material phase intermixed between the first and the second materials (M1, M2). Said third material (M3) has a coefficient of thermal expansion ([alpha]3) intermediate between the first coefficient of thermal expansion ([alpha]1) of the first material (M1) and the second coefficient of thermal expansion ([alpha]2) of the second material (M2).

Description

technical field [0001] The invention relates to a method for manufacturing a stainless steel / alumina functionally graded material shape without material defects, especially a method using plasma discharge sintering technology (SPS). By stabilizing alumina ceramics in stainless steel, it is possible to improve thermal properties, wear resistance, and introduce electrical insulation to the alloy. Background technique [0002] Functionally graded material (FGM) is a material design concept that provides a way to relieve residual thermal stress and combine the mutually incompatible properties of two disparate materials, such as by adding layers of pure refractory ceramics and pure metals A gradient composite interlayer of these two materials placed between the layers combines the heat resistance, wear resistance and oxidation resistance of refractory ceramics with the high toughness, strength and machinability of metals. [0003] Typically, metal / ceramic FGM systems with gradie...

AI Technical Summary

Problems solved by technology

[0014] Although the plastic deformation and the generation of interfacial separation in the SUS316-enriched layer can be greatly reduced by inserting the optimized gradient composite interlayer, it is still unavoidable that Al 2 o 3 and Al 2 o 3 The appearance of cracks in the enriched layer

The main difficulty is that the calculated value of the residual tensile stress in the theoretical FGM sample is not the same as that of dense Al 2 o 3 The range of bending strength of ceramics (250-275MPa) is very close

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