Effect of Silicon Addition on High-Temperature Solid Particle Erosion-Wear Behaviour of Mullite-SiC Composite Refractories Prepared by Nitriding Reactive
Solid particle erosion-wear experiments on as-prepared mullite-SiC composite refractories by nitriding reactive sintering were performed at elevated temperatures, using sharp black SiC abrasive particles at an impact speed of 50？m/s and the impact angle of 90° in the air atmosphere. The effects of silicon powder addition and erosion temperature on the erosion-wear resistance of mullite-SiC composite refractories were studied. The test results reveal that Si powders caused nitriding reaction to form β-sialon whiskers in the matrix of mullite-SiC composite refractories. The erosion-wear resistance of mullite-SiC composite refractories was improved with the increase of silicon powder addition and erosion temperature, and the minimum volume erosion rate was under the condition of 12% silicon added and a temperature of 1400°C. The major erosion-wear mechanisms of mullite-SiC composite refractories were brittle erosion at the erosion temperature from room temperature to 1000°C and then plastic deformation from 1200°C to 1400°C. 1. Introduction With the development of technology of circulating fluidized bed boiler, garbage incineration boiler, and coke dry quench there is a growing demand for high-temperature erosion-wear-resistant materials with better performances whereas the conventional wear-resistant materials cannot fully meet these requirements anymore. For instance, the refractory linings materials for circulating fluidized bed boiler are commonly eroded between 850°C and 1100°C by the coal powders, high-melting mineral impurity particles, and limestone grits for desulfurizing; their services can be severely shortened by such high-temperature erosion-wear [1, 2]. At present, the commonly used wear-resistant refractories mainly include the traditional mullite-SiC [3], SiC bricks, and Si3N4/sialon bonded SiC [4]. The traditional mullite-SiC bricks cannot meet the serve in high temperature due to their low erosion-wear resistance. SiC bricks and Si3N4/sialon bonded SiC bricks cannot be used on a large scale because of their high cost. Therefore, it is essential to devise a new sort of promising candidate erosion resistant material with high performance, low cost, and long service life. β-sialon is a kind of solid solutions with the formula Si6–zAlzOzN8–z ( ) where Si4+ and N3？ are partially replaced by Al3+ and O2？, respectively. Such replacements without changing the crystal structure only increase the crystal unit sizes [5, 6]. Sialon-based materials are regarded as a promising candidate for erosion resistant materials, because of their excellent
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