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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Microstructure and tribological properties of ZrO_2(Y_2O_3) matrix composites doped with different solid lubricants from room temperature to 800℃
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Microstructure and tribological properties of ZrO_2(Y_2O_3) matrix composites doped with different solid lubricants from room temperature to 800℃

机译：室温至800℃掺杂不同固体润滑剂的ZrO_2（Y_2O_3）基复合材料的组织和摩擦学性能

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摘要

In this paper, spark plasma sintering is employed to synthesize a variety of self-lubricating ZrO_2(Y_2O_3) matrix composites by tailoring the chemical compositions. The additives of BaF_2, CaF_2) Ag, Ag_2O, Cu_2O, BaCrO_4, BaSO_4, SrSO_4 and CaSiO_3 were incorporated into the ceramic matrix to evaluate their potentials as effective high-temperature solid lubricants from room temperature to 800℃ by using a ball-on-block friction and wear tester in sliding against alumina ball. For a comparative study, ZrO_2(Y_2O_3) matrix composites incorporated with and without graphite or MoS_2 were also investigated under the identical test conditions. The relationships among composition, microstructure and tribological properties of the composites are investigated to identify their self-lubrication mechanisms. The unlubricated ZrO_2( Y_2O_3 )-Al_2O_3 (TZ3Y20A) ceramics have a friction coefficient of 1.15 and a wear rate in the order of 10~(-4)mm~3/Nm at 800℃, while the TZ3Y20A-SrSO_4 composites exhibit a steady-state friction coefficient of less than 0.2 and a wear rate in the order of 10~(-6) mm~3/Nm from room temperature to 800℃. Surface fatigue and brittle fracture are considered as the dominating wear mechanism of unmodified TZ3Y20A ceramics at 800℃. However, for self-lubricating TZ3Y20A-SrSO_4 composites, the formation, plastic deformation and effective spreading of SrSO_4 lubricating films are the most important factor to reduce friction and wear rate over a wide temperature range.
机译：本文采用火花等离子体烧结法，通过调整化学成分，合成了多种自润滑的ZrO_2（Y_2O_3）基复合材料。将BaF_2，CaF_2）Ag，Ag_2O，Cu_2O，BaCrO_4，BaSO_4，SrSO_4和CaSiO_3的添加剂掺入陶瓷基体中，以通过使用滚珠球从室温到800℃评估其作为有效的高温固体润滑剂的潜力。阻止摩擦和磨损测试仪在氧化铝球上滑动。为了进行比较研究，在相同的测试条件下还研究了掺入和不掺入石墨或MoS_2的ZrO_2（Y_2O_3）基复合材料。研究了复合材料的组成，微观结构和摩擦学性能之间的关系，以确定其自润滑机理。未润滑的ZrO_2（Y_2O_3）-Al_2O_3（TZ3Y20A）陶瓷在800℃下的摩擦系数为1.15，磨损率约为10〜（-4）mm〜3 / Nm，而TZ3Y20A-SrSO_4复合材料表现出稳定的性能。从室温到800℃，摩擦系数小于0.2，磨损率约为10〜（-6）mm〜3 / Nm。表面疲劳和脆性断裂被认为是未经改性的TZ3Y20A陶瓷在800℃下的主要磨损机理。但是，对于自润滑TZ3Y20A-SrSO_4复合材料，SrSO_4润滑膜的形成，塑性变形和有效铺展是在较宽的温度范围内降低摩擦和磨损率的最重要因素。

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