Publication
Ni-Al2O3 nacre-like composites through hot-pressing of freeze-cast foams
2019
Journal paper
Journal paper
Abstract
A multi-step process is developed to create a nacre-like ceramic/metal composite. First, a slurry of Ni-coated alumina platelets and NiO nano-particles is directionally freeze-cast and the ice is sublimed, creating a foam with aligned lamellar walls containing the two solid phases. Second, the foam is sintered under hydrogen to reduce the NiO phases to metallic Ni micro-particles. Third, hot pressing densifies both the channels between the aligned walls and some of the porosity within the walls, resulting in a brick-and-mortar composite with partially-aligned alumina platelets and 30 vol% Ni. Evidence of various toughening mechanisms - crack deflection, branching and bridging, as well as metal plasticity - is observed during three-point bending tests of double-edge notched beams.
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Related concepts (32)
Solid
Solid is one of the four fundamental states of matter (the others being liquid, gas, and plasma). The molecules in a solid are closely packed together and contain the least amount of kinetic energy. A solid is characterized by structural rigidity (as in rigid bodies) and resistance to a force applied to the surface. Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire available volume like a gas.
Phase (matter)
In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is another separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.
Solid-state chemistry
Solid-state chemistry, also sometimes referred as materials chemistry, is the study of the synthesis, structure, and properties of solid phase materials. It therefore has a strong overlap with solid-state physics, mineralogy, crystallography, ceramics, metallurgy, thermodynamics, materials science and electronics with a focus on the synthesis of novel materials and their characterization. A diverse range of synthetic techniques, such as the ceramic method and chemical vapour depostion, make solid-state materials.
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