Sliding abrasion resistance assessment of metallic materials for elevated temperature mineral processing conditions
Sliding abrasion resistance assessment of metallic materials for elevated temperature mineral processing conditions
复制标题
DOI：
10.1016/j.wear.2009.06.023
复制
发表时间：
2009-10
期刊：
影响因子：
5
通讯作者：
L. C. Jones;R. Llewellyn
中科院分区：
文献类型：
--
作者：
L. C. Jones;R. Llewellyn
在采矿、加工和运输矿石及相关废物的过程中，多种恶劣环境会导致严重磨损、极高的维护成本和生产损失。高温处理是影响可能的建筑材料性能的条件之一。这表现为硬度和强度降低，在长期暴露期间材料的结构和性能发生有害变化，以及氧化和腐蚀增加。热固体的牵引链输送（例如在熔炼中）通常导致链节组件中的连接销和孔表面以及在封闭通道中推动颗粒的移动叶片的三体滑动磨损和粘着磨损。在20°C和350°C条件下，使用经过改装的Cameron-Plint TE 77磨损试验机，在往复滑动磨损接触条件下，对所选材料的此类应用进行了评估。这些包括目前的渗碳低合金钢、其他钢、铬白色铸铁和钴基合金，以散装、覆盖和表面处理的形式。使用扫描电子显微镜检查磨痕，确定了影响高抗性粉末冶金（PM）工具钢和HVOF涂层的主要磨损机制为微划痕和压痕导致微断裂。具有最低阻力的材料显示出通过微犁去除显著材料的证据。在测试过程中，在一些样品上形成氧化层似乎是有益的。
The multiplicity of harsh environments in mining, processing and transporting ore and related waste, cause severe wear, extremely high maintenance costs and lost production. Elevated temperature processing is one of the conditions that influence the performance of possible materials of construction. This takes the forms of reduced hardness and strength, deleterious changes in the structure and properties of materials during protracted exposure and increased oxidation and corrosion. Drag chain conveying of hot solids e.g. in smelting, typically results in three-body sliding abrasion and adhesive wear of connecting pins and hole surfaces in link assemblies and of moving paddles that impel the particulates in enclosed channels. Selected materials have been assessed for this type of service under reciprocating sliding abrasion contact conditions using an adapted Cameron-Plint TE77 wear rig at 20°C and 350°C. These include the current carburised low alloy steel, other steels, Cr white irons and Co-based alloys in bulk, overlay and surface treated forms. Examination of wear scars, using scanning electron microscopy, identified the main wear mechanisms affecting the highly resistant powder metallurgical (PM) tool steels and HVOF coating as micro-scratching and as indentation leading to micro-fracture. Materials with lowest resistance displayed evidence of significant material removal by micro-ploughing. The formation of oxide layers on some samples during testing appeared to be beneficial.