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首页> 外文期刊>Journal of Materials Engineering and Performance >CVD Diamond Coating for Erosion Protection at Elevated Temperatures
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CVD Diamond Coating for Erosion Protection at Elevated Temperatures

机译：用于高温腐蚀保护的CVD金刚石涂层

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摘要

Small solid particles entrained in a gas-fluid turbomachinery flow can cause degradation of the component surfaces containing the flow by erosion and corrosion processes. As diamond is the hardest known material, much work has been done to use polycrystalline diamond (PCD) as a protective coating on parts operating in a hostile and abrasive environment. Little attention is given in the literature to the high-temperature erosion behavior of chemical vapor deposition (CVD) diamond on different substrates. The objectives of this research were to develop CVD diamond erosion barriers for surface protection of cemented tungsten carbide at high temperatures and to study the erosion behavior of the coatings. Microwave plasma chemical vapor deposition (MPCVD) was used to apply diamond films on WC-6 percent Co. The erosion behavior of the coated specimens was investigated experimentally by exposing them to abrasive particle-laden flow in a high-temperature wind tunnel. The obtained results show the effects of impingement angle, temperature, and particle dose on the erosion rate. The data demonstrate that uncoated substrates suffer 6-7 times higher wear compared to diamond-coated samples at elevated temperatures up to 538 deg C when exposed to alumina particle flow. This study indicates that polycrystalline diamond is emerging as a promising erosion protective coating for high-temperature applications.
机译：夹带在气体涡轮机气流中的小固体颗粒会通过腐蚀和腐蚀过程导致包含气流的零部件表面降解。由于金刚石是已知的最硬材料，因此已经做了很多工作，将多晶金刚石（PCD）用作在恶劣和磨蚀环境下工作的零件上的保护涂层。在文献中很少关注化学气相沉积（CVD）金刚石在不同基材上的高温腐蚀行为。这项研究的目的是开发CVD金刚石腐蚀阻挡层，以在高温下保护硬质合金碳化钨并研究涂层的腐蚀行为。使用微波等离子体化学气相沉积（MPCVD）在WC-6％的Co上涂覆金刚石薄膜。通过在高温风洞中将其暴露于载有磨粒的流中，对涂层试样的腐蚀行为进行了实验研究。获得的结果表明了撞击角度，温度和颗粒剂量对腐蚀速率的影响。数据表明，在暴露于氧化铝颗粒流的情况下，在高达538℃的高温下，未涂覆的基材的磨损比金刚石涂覆的样品高6-7倍。这项研究表明，多晶金刚石正在成为一种有前途的耐高温保护涂层。

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