Structure and properties of titanium-carbide aluminum


MAX phase materials integrate many advantages of ceramic and metal materials, including low density, high modulus, good electrical (thermal) conductivity, thermal shock resistance, and excellent oxidation resistance at high temperatures. The ternary layered compound MAX phase is A new type of cermet functional material. It has a layered hexagonal structure composed of an MX layer and A atomic layer arranged alternately. The main difference between phases 211, 312, and 413 is the number of M atoms between each of the crystal's two layers of A atoms. In other words, the Mn+1AXn phase comprises an n+1 MX layer and 1A layer atomic plane. A robust covalent bond binds MX, and MX lamellar and A atomic plane are bound by weak covalent bonds, which makes it easier for A atom to break free from the binding of MX lamellar. This unique bond property gives the MAX phase excellent performance. With the increase of MX lamellar thickness, the properties are close to the corresponding M-X binary carbide, and the properties of the MAX phase can be improved by adjusting MX lamellar thickness. The crystal structure of the MAX phase and the solid covalent bond between the M-X phase give it a higher elastic modulus and strength, while the lower shear modulus comes from the weak bond between the MX lamellar layer and the A plane. In the same system's MAX phase, with the MX layer's thickening, the bulk modulus and elastic modulus increase continuously. Therefore, MAX phase ceramic material with higher modulus can be obtained by the thickness of the MX layer. As a high-temperature structural material, it should have good high-temperature mechanical properties and excellent oxidation resistance. In high-temperature oxidation, the oxidation resistance mainly depends on whether the material can form a thick protective oxide film, such as alumina and silicon dioxide. Continuous Al2O3 protective film can be developed due to the selective oxidation of Al in the oxidation process. The experimental results also show that Ti3AlC2 has excellent thermal cycling resistance, and the resulting oxide film is compact and well combined with the substrate without spalling. The oxide film of titanium carbide (Ti3SiC2) at high temperature is divided into two layers, the outer layer is TiO2, and the inner layer is a mixture of TiO2 and SiO2. The oxide film's density and substrate adhesion is good. If you are looking for high quality, high purity and cost-effective titanium aluminum carbide, or if you require the latest price of titanium aluminum carbide, please feel free to email contact mis-asia.

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