Polyether-ether-ketone (PEEK) and polyimide (PI) are two kinds of engineering polymer materials widely used as roller bearing cages and rings under extreme environment because of their noise reduction and corrosion resistance properties. The Si3N4 ceramic is the most common ball bearing material. Many current engineering applications of ball bearings require aqueous lubrication. Therefore, this study presents the aqueous lubrication of tribopairs formed by PEEK and PI material sliding against Si3N4 ceramic. Experimental results show that two tribopairs exhibited the similar tribological properties under the dry condition. Water as a lubricant for the PI–Si3N4 tribopair pairs effectively reduces both friction coefficients by 35.5% and wear rates by 32%. The water absorption of PI induces better tribological properties by changing the tribopair surface properties. In addition, the dimples appearing on the PI tribopair surface under water generate additional hydrodynamic lubrication and further improve the friction properties of surface. The PEEK–Si3N4 tribopair shows similar friction coefficients under two kinds of environments. The wear rates under water are approximately more than two times of that under dry sliding. However, water inhibits the appearance of the crush phenomenon and enhances the carrying capacity of the tribopair. Energy dispersive spectroscopy and X-ray diffraction spectra demonstrate no chemical corrosion. The 3D profiler and SEM morphologies illustrate that the transfer film would be formed from the surface of PEEK under water but hindered under dry friction. Overall, the PI–Si3N4 tribopair exhibits better properties than PEEK under water and is promising for future applications in the bearing industry.

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Aqueous lubrication and surface microstructures of engineering polymer materials (PEEK and PI) when sliding against Si3N4

Tribological behaviors of 30 vol% carbon fiber–reinforced polyetheretherketone (PEEK-1) and 30 vol% carbon fiber/PTFE/graphite-reinforced polyetheretherketone (PEEK-2) sliding against AISI630 steel under seawater lubrication were investigated comparatively with a ring-on-ring contact test apparatus. The results revealed that PEEK-2 had a lower friction coefficient and much better wear resistance than PEEK-1, especially under a relatively heavy load. Furthermore, PEEK-2 exhibited much better friction and wear properties under seawater lubrication than under dry friction, and it was slightly inferior to that under pure water lubrication due to the corrosive effect of seawater on the surface of AISI630 steel. Additionally, the worn surface morphology of PEEK composites and AISI630 steel were obtained through scanning electron microscopy (SEM) and optical microscopy, respectively. The main tribological mechanisms of the friction pair under seawater lubrication were abrasive wear and indirect corrosive wear. T...

Comparative Evaluation of Tribological Characteristics of CF/PEEK and CF/PTFE/Graphite Filled PEEK Sliding against AISI630 Steel for Seawater Hydraulic Piston Pumps/Motors

海洋摩擦学，摩擦学的一个新研究领域，被建立并且发展中。海水里的摩擦学上的调查有重要意义到海洋利用。在这篇论文， UHMWPE 的 tribological 行为， PTFE 以及 Ekonol/PTFE，在海水里对 GCr15 钢和 Ni-Cr-WC 合金滑动的 graphite/PTFE 和 CF/PTFE 被调查，并且与那些相比在纯水里。结果证明在海水里影响五聚合材料的 tribological 行为的主要因素是腐蚀剂效果和海水的润滑效果。当在海对 GCr15 滑动的聚合材料流水时，海运由于相反的脸的严肃的腐蚀流水，相反的脸的表面粗糙大部分增加。作为结果，媒介的润滑效果严厉地减少，相反的脸的耕作效果极大地增加。那么磨擦系数并且穿在海水里对 GCr15 滑动的五材料的率比在另外的条件下面的那些大得多。这穿模型，取决于由媒介的相反的脸的腐蚀，能被叫间接腐蚀剂穿。在另外的三个条件下面，比 GCr15 比纯水和 Ni-Cr-WC 的更好的 wettability 由于海的更优异的润滑效果流水，磨擦系数并且穿下列顺序的五材料增加的率：在在在纯水里对 GCr15 滑动的纯水 < 对 Ni-Cr-WC 滑动的海水 < 对 Ni-Cr-WC 滑动。而且与另外的材料相比， CF/PTFE 是有更优异的耕作的那并且穿抵抗在纯并且海水，它是对很好合适的潜在的摩擦材料纯并且海水润滑油。

Tribological behaviors of some polymeric materials in sea waterTribological behaviors of some polymeric materials in sea water

Friction and wear behaviours of self-lubricating peek composites for articulating pin joints

An Assessment of Tribological Characteristics of Different Materials under Sea Water Environment

Tribological behaviors of carbon fiber reinforced polyetheretherketone (CFR PEEK) sliding against silicon carbide ceramic under seawater lubrication were investigated. The effects of sliding veloci...

Tribological behaviors of carbon fiber reinforced polyetheretherketone sliding against silicon carbide ceramic under seawater lubrication

The invention relates to a test method for an open type seawater hydraulic system in a deep sea simulation environment, and the test method is used for simulating performance testing researches of seawater hydraulic elements in a 4500-m deep sea. According to a performance test of a seawater hydraulic pump, when a three-position four-way solenoid directional valve is at a neutral position and in a non-through-flow state, outlet pressure of the seawater hydraulic pump is adjusted by changing through flow of a throttle valve outside a deep sea simulation hyperbaric chamber, so that the volume efficiency of the seawater hydraulic pump at the rated speed and different pressures is tested. The deep sea test is simulated through the deep sea simulation hyperbaric chamber, so that a lot of adverse factors of the sea test are avoided, the test is simpler and safer, test cost is reduced, the problems of test power supply and weight limit of testing equipment are solved, safety and accuracy of the test are improved, research efficiency of the seawater hydraulic elements is improved, and the test method is of great significance in the researches of the seawater hydraulic elements.

Test method for open type seawater hydraulic system in deep sea simulation environment

The invention discloses an axial seal hoop quick-opening horizontal type deep sea simulation cabin which comprises a front end cover, a barrel body, a rear end cover, a saddle, a circular hoop and a hoop locking mechanism. The front end cover is placed on the saddle and supported by a movable frame. One end of the front end cover stretches out in the axial direction to form an annular step, the annular step is provided with at least two rectangular grooves, and O-shaped rubber rings I are mounted in the rectangular grooves. The annular step stretches into the end of the barrel body, the annular step and the inner wall of the barrel body are sealed through the O-shaped rubber rings I, and the front end cover and the end of the barrel body are connected and locked through the annular hoop and the hoop locking mechanism. A cylindrical boss is arranged at one end of the rear end cover in the axial direction. The cylindrical boss is provided with a rectangular groove in the circumferential direction, the cylindrical boss stretches into the tail end of the barrel body, and the cylindrical boss and the inner wall of the barrel body are sealed through an O-shaped rubber ring II in the rectangular groove. The rear end cover is connected with the tail end of the barrel body through a flange. The barrel body and the front end cover are in an axial seal structural mode, and therefore the sealing reliability of the horizontal type deep sea simulation cabin can be improved obviously.

Axial seal hoop quick-opening horizontal type deep sea simulation cabin

The utility model discloses an axially-sealed clamp-fast-opening horizontal type deep-sea simulation cabin. The axially-sealed clamp-fast-opening horizontal type deep-sea simulation cabin comprises a front end cover, a cylinder body, a rear end cover, a saddle, a circular clamp and a clamp locking mechanism; the front end cover is arranged on the saddle and is supported by a mobile frame; an annular step axially protrudes out from one end of the front end cover; the annular step is provided with at least two rectangular grooves; O-shaped rubber rings I are installed in the rectangular grooves; the annular step extends into the head end of the cylinder body, and gaps between the annular step and the inner wall of the cylinder body are sealed through the O-shaped rubber rings; the front end cover and the head end of the cylinder body are connected and locked together through the circular clamp and the clamp locking mechanism; one end of the rear end cover is axially provided with a circular column-shaped boss; rectangular grooves are formed along the circumference of the circular column-shaped boss; the circular column-shaped boss extends into the tail end of the cylinder body; gaps between the circular column-shaped boss and the inner wall of the cylinder body are sealed through the O-shaped rubber rings II in the rectangular grooves; and the rear end cover is connected with the tail end of the cylinder body through a flange. The cylinder body and the front end cover are of an axially-sealed structure, and therefore, the reliability of the sealing of the horizontal type deep-sea simulation cabin can be greatly improved.

Yuan Shaohua

Papers

Comparative Evaluation of Tribological Characteristics of CF/PEEK and CF/PTFE/Graphite Filled PEEK Sliding against AISI630 Steel for Seawater Hydraulic Piston Pumps/Motors

Tribological behaviors of carbon fiber reinforced polyetheretherketone sliding against silicon carbide ceramic under seawater lubrication

Test method for open type seawater hydraulic system in deep sea simulation environment

Axial seal hoop quick-opening horizontal type deep sea simulation cabin

Axially-sealed clamp-fast-opening horizontal type deep-sea simulation cabin