A novel hollow short fiber NiCr breathable material

The lightweight high-temperature nickel-based alloys exhibit significant potentials for application of next-generation high-temperature breathable materials. The article describes the synthesis of a novel hollow short fiber NiCr breathable material through the manipulation of composite material structures, in order to develop a new material system for breathable high-temperature alloys. The microstructure of the porous materials was investigated using scanning electron microscopy, X-ray diffraction, and transmission electron microscopy (TEM). The Ni–Cr breathable materials with densities of 4.5, 5.0, 5.5, and 6.0 g/cm³ were produced, exhibiting a maximum tensile strength of 240.4 MPa at room temperature and an elastic modulus of 92.5 GPa. At a density of 4.5 g/cm³ the permeability is 2.12 × 10^–12 m², indicating good air permeability. The hollow fibers in the NiCr breathable alloy conferred lightweight structural advantages, significantly enhancing the breathability of the porous material and reducing its thermal conductivity. The present investigation provides insights into the synthesis and high-temperature applications of lightweight, high-strength, breathable materials.