纳米耐高温涂层的应用及分析

Analysis and application of the heat-resistant nano-coating

特殊不锈钢、高合金钢、高温合金因其本身合金元素含量较高,高温变形温度狭窄,钢坯加热时容易产生表面渗透氧化且烧损严重。钢坯加热中产生的氧化渗透,造成轧制后的成品表面存在裂纹、亚表面发纹等缺陷,解决方法之一是采用无氧化炉对钢坯加热,但存在基础投资费用及装备使用成本较高的问题;而采用耐高温纳米涂料涂覆钢坯表面,耐热温度达1 300℃,避免了钢坯表面渗透氧化,成品钢材表面基本达到零脱碳,降低了钢坯表面烧损率,使成品材表面质量明显提高,且工艺简单,可操作性强,生产成本低,具有良好的应用前景。

Special stainless steel,high alloy steel and superalloy have a narrower high-temperature deformation range due to their higher alloying element contents.During the reheating process,billets are subject to be oxidized on the surface and in the subsurface with severe burning loss.The oxidation may lead to defects on the rolled products,such as surface cracks and stripes in the subsurface.Using a non-oxidizing heat treatment furnace is one of the solutions,however,it has limitation for high equipment investment and high operational cost.The heat-resistant nano-coating can be used to cover the surface of billet to avoid surface oxidation.Its heat-resistance temperature can be up to 1 300℃.With this nano-coating,the surface oxidation of billets can be avoided,the burning loss can be reduced due to the nearly-zero decarburization on the surface of the finished products.All these have remarkably improved the surface quality of the finished products.Nano-coating has a wide and potential application because it is simple in technique,easy in operation and low in production cost.