High temperature oxidation of calcium hexaboride powders


What is calcium hexaboride?

The oxidation process of calcium hexaboride (CaB6) ceramic powder was investigated systematically in this paper. The CaB6 powder samples were heated continuously from room temperature to 1473 K at a heating rate of 10 K/min using differential scanning calorimetry (DSC). The oxidation tests were conducted at different exposure temperatures, and the phases and morphologies of the samples before and after exposure were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was pointed out that there were two reactions in the CaB6 oxidation up to 1473 K, corresponding to the formations of CaB4O7 and CaO. About 16.8% and 45% of weight gain occurred due to oxidation in the air from 940 to 1200 K and from 1200 to 1455 K, respectively. The mechanism of oxidation was analyzed.


High temperature oxidation of calcium hexaboride powders

As one of the alkali-earth metal borides, calcium hexaboride (CaB6) belongs to the group of refractory non-oxide metal-like compounds characterized by high melting point, high strength, and high chemical stability, which can be used as abrasives, tools, and high-temperature structural materials. Several studies of this material have been made. Like other non-oxide ceramics, CaB6 will be oxidized when used at elevated temperatures, which will shorten its life and degrade its properties. However, previous investigations on the oxidation of borides have been concentrated on diborides, such as TiB2, ZrB2, and HfB2. A few papers have discussed the development of the oxidation of hexaboride materials. In this letter, the oxidation process of CaB6 powders was investigated from room temperature to high temperature.


Experimental procedures of calcium hexaboride

The CaB6 powder used in this study was commercially available with a purity of 98.2% and particle size of 23 μm. It was fabricated by the boron carbon method. One as-received batch was used for all tests. Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TG) were conducted using a differential scanning calorimeter (Model: DSC 404/3/F, NETZSCH, Germany) using an alumina pan heated at a rate of 10 K/min. Oxidation tests were carried out in an electric furnace in the air. The results of DSC and TG for CaB6 starting powder are shown in Fig. 1. Thermal analysis was conducted to confirm the oxidation initiation temperature. From Fig. 1, there are two prominent exothermic peaks from room temperature to 1473 K, at 1061.5 and 1297.4 K, which were assumed to be due to CaB6 oxidation.


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