Silicoaluminum Carbonitride with Anomalously High Resistance to Oxidation and Hot Corrosion

Abstract

Due to their excellent thermal and mechanical properties silicon‐based ceramics and composites are prime candidates for high temperature structural applications. In this communication the authors report for the first time that amorphous silicoaluminum carbonitride (SiAlCN) ceramics possess anomalously high resistance to oxidation and hot‐corrosion. A mechanism underlying the observed phenomena is discussed.

Advanced coatings on the basis of Si(C)N precursors for protection of steel against oxidation

“…[22][23][24][25][26][27] The formation and growth of a protective SiO 2 layer, which has the lowest oxygen permeability among all simple oxides, is the main reason for the excellent oxidation resistance of PDCs. 28 With exception of the polysiloxane systems, most investigations on polymer-derived coatings have been done on coatings pyrolysed in inert atmospheres like argon or nitrogen. Only a few authors describe the treatment of precursor-based coatings in oxygen containing atmospheres like air or helium/oxygen mixtures.…”

Frequency-dependent conductive behavior of polymer-derived amorphous silicon carbonitride

“…Compared to polycrystalline SiC-and Si 3 N 4 -based ceramics prepared by powder processing, PDCs possess many unusual and superior properties, including excellent stability against high-temperature decomposition and creep [1][2][3], outstanding oxidation and corrosion resistance [4][5][6], high temperature semiconducting behavior up to 1300°C [7,8], and extremely high piezoresistive effect [9][10][11]. These properties, combined with the direct polymer-to-ceramic process, make PDCs very promising for applications in ceramic fibers [12], ceramic matrix composites [13], energy storage [14], porous components [15], and high-temperature micro-sensors [16,17].…”

Preparation and characterization of high temperature SiCN/ZrB2 ceramic composite

“…Papendorf et al [8] have synthesized SiHfCN from a polysilazane and hafnium alkoxide, which has an enhanced thermal stability with respect to decomposition up to 1600 1C in Ar. An et al [9][10][11] have synthesized SiAlCN from a polyurea(methylvinyl) silazane and aluminum isopropoxide, which resists oxidation up to 1400 1C in air. However, the amount of M introduced is limited by chemical modification and the modifiers contain oxygen, which has a detrimental effect on the high-temperature properties of SiCN ceramic [12].…”