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Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties

机译：在其所选性能下添加层状润滑材料的铁烧结制造工艺条件的影响研究

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The purpose of the conducted experiments was to test the selected properties of materials intended for porous sintered bearings containing layered materials in the form of powders with an average particle size of 0.5–1.5 μm, with very good tribological properties. The subject of the research was a sinter based on iron powder with the addition of layered materials; molybdenum disulfide MoS2 (average particle size 1.5 μm), tungsten disulfide WS2 (average particle size 0.6 μm), hexagonal boron nitride, h-BN (average particle size 0.5 and 1.5 μm) with two different porosities. The article presents the results of density and porosity tests, compressive strength, metallographic and tribological tests and the assessment of changes in the surface condition occurring during the long storage period. The use of layered additives allows for an approximately 20% lower coefficient of friction. In the case of sulfides, the technological process of pressing 250 MPa, 350 MPa, and sintering at a temperature of 1120 °C allows us to obtain a material with good strength and tribological properties, better than in the case of h-BN. However, the main problem is the appearance of elements from the decomposition of sulfide compounds in the material matrix, which results in rapid material degradation. In hexagonal boron nitride, such disintegration under these conditions does not occur; the material as observed does not degrade. In this case, the material is characterized by lower hardness, resulting from a different behavior of hexagonal boron nitride in the pressing and sintering process; in this case, pressing at a pressure of 350 MPa seems to be too low. However, taking into account that even with these technological parameters, the obtained material containing 2.5% h-BN with an average grain size of 1.5 μm allowed obtaining a coefficient of friction at the level of 0.41, which, with very good material durability, seems to be very positive news before further tests.
机译：进行的实验的目的是测试用于含有粉末形式的多孔烧结轴承的材料的所选性质，平均粒径为0.5-1.5μm，具有非常良好的摩擦学性质。研究主题是基于铁粉的烧结粉，加入分层材料;二硫化钼MOS2（平均粒径1.5μm），钨二硫化物Ws2（平均粒径0.6μm），六边形氮化硼，H-Bn（平均粒径0.5和1.5μm），具有两种不同的孔隙率。本文介绍了密度和孔隙率测试，抗压强度，金相和摩擦学检测的结果，以及在长储存期间发生的表面状况的变化评估。分层添加剂的使用允许摩擦系数较高约20％。在硫化物的情况下，在1120℃的温度下压制250MPa，350MPa和烧结的技术过程允许我们获得具有良好强度和摩擦学性质的材料，而不是在H-BN的情况下更好。然而，主要问题是从材料基质中的硫化物化合物分解的元素的外观，这导致了快速的材料降解。在六边形氮化物中，在这些条件下不会发生这种崩解;观察到的材料不会降低。在这种情况下，该材料的特征在于硬度较低，由六边形氮化物中的不同行为中的压制和烧结过程产生;在这种情况下，在350MPa的压力下按压似乎太低。然而，考虑到即使是这些技术参数，也是含有2.5％H-BN的所得材料，其平均晶粒尺寸为1.5μm，允许在0.41的水平下获得摩擦系数，其具有非常好的材料耐久性，似乎在进一步测试之前是非常积极的消息。

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