Pressureless manufacturing of Cr₂AlC compound and the temperature effect

ABSTRACT

In this work, facile pressureless sintering process is explored to manufacture the promising Cr₂AlC MAX phase material, using three elemental powders as starting materials. The powders are mixed in a molar ratio of Cr:Al:C = 2:1.2:1, and ball-milled for particle refinement and homogenization. The powder mixture is sintered at differing temperatures from 1000 to 1400°C without applying pressure. Highly pure Cr₂AlC MAX phase is obtained from sintering at 1200°C. The Cr₂AlC compound shows laminated microstructures and high crystal quality. At other temperatures, significant amounts of secondary phases are observed. The optimized Cr₂AlC compound exhibits a metallic behavior and superior oxidation resistance. The simple manufacturing method of Cr₂AlC MAX phase developed in this work may also be applied for fabrication of a wider range of MAX phases.

KEYWORDS:

• Cr₂AlC
• max
• pressureless
• sintering
• elements
• milling
• temperature
• microstructures
• xrd
• tga

Additional information

Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [2019R1A2C1008746].