2020年2月1日 · This paper presents a comparison of the oxidation mechanisms of ZrB 2-SiC, HfB 2-SiC and HfB 2-SiC-Y 2 O 3 by using the same real-time LIF detection strategy of evaporated BO 2 above the ZrB 2, ZrB 2-SiC samples heated in air, a technique which has been applied for the first time in our previous article [25].

2019年3月1日 · In this study, the Laser Induced Fluorescence (LIF) technique is used to detect BO2 radicals in the gas phase above heated ZrB 2 and ZrB 2 -20 vol. % SiC samples in air, in order to provide an in situ and real-time monitoring of their thermal oxidation. Samples are heated up to 1923 K in air flow with a 2 kW CO 2 laser.

摘要 利用激光诱导荧光 (LIF) 实时检测从干燥空气中加热至 1873K 的样品中蒸发的 BO2(g)，研究了 ZrB2-SiC、HfB2-SiC 和 HfB2-SiC-Y2O3 的氧化行为。 对于每种成分，可以精确确定氧化的相关步骤（二氧化硅的形成、挥发等）。

2018年6月25日 · Dispersion of SiC particles into ZrB 2 was found to be an effective way to prevent extensive oxidation. However, the formation of a SiC-depleted layer can become a critical problem because it can lead to spallation and delamination of the protective surface layer.

摘要 采用热力学平衡方法,以1227℃为例,计算了硼化锆(ZrB_2)和碳化硅(SiC)的挥发相图,并由此例构建了硼化锆-碳化硅复合材料(ZrB_2-SiC)的挥发相图。在1.01×105Pa条件下,计算得到ZrB_...

2011年1月1日 · Non-isothermal, isothermal and cyclic oxidation behavior of hot pressed ZrB 2 –20 (vol.%) SiC (ZS) and HfB 2 –20 SiC (HS) composites have been compared. Studies involving heating in thermogravimetric analyzer have shown sharp mass increases at 740 and 1180 °C for ZS, and mass gain till 1100 °C followed by loss for HS.

In this study, the Laser Induced Fluorescence (LIF) technique is used to detect BO 2 radicals in the gas phase above heated ZrB 2 and ZrB 2-20 vol. % SiC samples in air, in order to provide an in situ and real-time monitoring of their thermal oxidation. Samples are heated up to 1923 K in air flow with a 2 kW CO 2 laser. The BO 2

摘要 本研究采用激光诱导荧光 (LIF) 技术检测加热后的 ZrB2 和 ZrB2-20 vol. 上方气相中的 BO2 自由基。 % SiC 样品在空气中，以提供对其热氧化的原位和实时监测。

-SiC and HfB 2-SiC-Y 2 O 3 is studied using the real-time Laser-Induced Fluorescence (LIF) detection of BO 2 (g) evaporated from samples heated up to 1873 K in dry air. For each composition, the relevant steps of oxidation (silica formation, volatilization, etc.) can be precisely determined. Moreover, the influence of

2019年3月1日 · Optical emission spectroscopy is used to investigate the oxidation of a hot-pressed ZrB 2 -SiC ultrahigh-temperature ceramic composite tested in the 1.2 MW Plasmatron facility at the von Karman… Dense samples of ZrB2–20 vol% SiC were successfully fabricated by spark plasma sintering without the use of sintering aids.