Ceramic-reinforced metal matrix composites(MMCs)display beneficial properties owing to their combination of ceramic and metal phases.However,the properties are highly dependent on the reinforcing phase composition,vol...Ceramic-reinforced metal matrix composites(MMCs)display beneficial properties owing to their combination of ceramic and metal phases.However,the properties are highly dependent on the reinforcing phase composition,volume fraction and morphology.Continuous fiber or network reinforcement morphologies are difficult and expensive to manufacture,and the often-used discontinuous particle or whisker reinforcement morphologies result in less effective properties.Here,we demonstrate the formation of a co-continuous ceramic-reinforced metal matrix composite using solid-state processing.Binder jet additive manufacturing(BJAM)was used to print a nickel superalloy part followed by post-processing via reactive sintering to form a continuous carbide reinforcing phase at the particle boundaries.The kinetics of reinforcement formation are investigated in order to develop a relationship between reactive sintering time,temperature and powder composition on the reinforcing phase thickness and volume fraction.To evaluate performance,the wear resistance of the reinforced BJAM alloy 625 MMC was compared to unreinforced BJAM alloy 625,demonstrating a 64%decrease in the specific wear rate under abrasive wear conditions.展开更多
基金funding support from the Natural Sciences and Engineering Research Council of Canada(NSERC)the Canada Research Chairs(CRC)Program+1 种基金Huys Industries and the CWB Welding Foundationthe Centre for Advanced Materials Joining and the Multi-Scale Additive Manufacturing Lab at the University of Waterloo。
文摘Ceramic-reinforced metal matrix composites(MMCs)display beneficial properties owing to their combination of ceramic and metal phases.However,the properties are highly dependent on the reinforcing phase composition,volume fraction and morphology.Continuous fiber or network reinforcement morphologies are difficult and expensive to manufacture,and the often-used discontinuous particle or whisker reinforcement morphologies result in less effective properties.Here,we demonstrate the formation of a co-continuous ceramic-reinforced metal matrix composite using solid-state processing.Binder jet additive manufacturing(BJAM)was used to print a nickel superalloy part followed by post-processing via reactive sintering to form a continuous carbide reinforcing phase at the particle boundaries.The kinetics of reinforcement formation are investigated in order to develop a relationship between reactive sintering time,temperature and powder composition on the reinforcing phase thickness and volume fraction.To evaluate performance,the wear resistance of the reinforced BJAM alloy 625 MMC was compared to unreinforced BJAM alloy 625,demonstrating a 64%decrease in the specific wear rate under abrasive wear conditions.
