Service performance of GF/Nano‐Al₂O₃/PA66 sucker rod centralizer in aqueous environment

Abstract

Sixteen groups of GF/Nano‐Al2O3/PA66 composite samples were prepared by injection molding process and orthogonal experimental design method. The water absorption, hardness, compressive strength, and tribological properties under water conditions were measured. The wear surface morphology and material transfer from mate pair were analyzed by scanning electron microscopy (SEM) and energy spectroscopy (EDS). The results show that the minimum friction coefficient of G25A1 ratio is 0.064, which is 54.3% and 72.2% lower than the two common used sucker rod centralizer materials, respectively; the wear rate of G20A7 is the minimum 7.46 × 10−5 mm3 (N m)−1, 63.6% and 19.9% lower than the two commonly used sucker rod centralizer materials, respectively; the water absorption, hardness and compression strength properties of 16 groups were improved; PA66 matrix composites with the best ratio of 20% GF and 7% Al2O3 were selected in this paper; the wear mechanism of the composite is fatigue wear and a little adhesive wear at moderate additive content, and it is easy to form a transfer film on the mating surface.

A Novel Strategy for Fabrication of Polyamide 66/Nanohydroxyapatite Composite Bone Repair Scaffolds by Low-Temperature Three-Dimensional Printing

“…It can be observed that the mechanical behavior of the 3D scaffolds underwent significant changes; the PA scaffold was damaged after compression, while the PH10 and PH30 scaffolds maintained their shape without destruction after compression. This is due to the absorption of water by PA66 in the aqueous environment, leading to the relaxation of polymer chains, which in turn altered the mechanical behavior of the scaffolds . The addition of HA apatite may counteract this effect, to some extent.…”

“…This is due to the absorption of water by PA66 in the aqueous environment, leading to the relaxation of polymer chains, which in turn altered the mechanical behavior of the scaffolds. 52 The addition of HA apatite may counteract this effect, to some extent. Our test results indicate that although there was a decline in mechanical properties after soaking in PBS, the compressive strength and elastic modulus of the PH30 composite scaffolds remained within acceptable ranges, similar to glenoid cancellous bone strength (6.7−17 MPa) (Figure S15, Table S1).…”