Investigation of tribological and corrosion properties in ceramic/PTFE coating

Abstract

Tribological and corrosion properties of chemically bonded ceramic coating (CBC) is limited due to the porous structure. To overcome the limitation, polytetrafluoroethylene (PTFE) is infiltrated into CBC by vacuum impregnation, and the related tribological and corrosion properties are investigated. CBC with the infiltration of PTFE (CBC/PTFE) shows a lower coefficient of friction than CBC because a transfer lubricant film is formed due to PTFE. In addition, the wear resistance is also improved with the infiltration of PTFE. Besides, CBC/ PTFE possesses a better corrosion resistance attributing to the excellent hydrophobicity of PTFE and the compact layer caused by the filling of PTFE into the pores of CBC.

Experimental study on combined effect of mechanical loads and corrosion using tube-packaged long-gauge fiber Bragg grating sensors

“…PTFE is a strong, tough, nonflammable synthetic resin polymerized from tetrafluoroethylene, with a slippery surface and high melting point, and can provide excellent chemical resistance with a working temperature up to 232°C. 47 With the purpose of ultimately achieving robustness for sensor installation and function, a discrete FBG sensor with 125 μm diameter was encapsulated in 100 mm PTFE tubing with 0.3 mm inner diameter and 0.5 mm outer diameter to extend the sensing length, forming a LFBG sensor, as shown in Figure 2. The FBG fiber was superglued to both ends of the PTFE tube to ensure that the Bragg grating remained in the center of the tube.…”

Improving the Tribological Performance of Phosphate-Bonded Coatings Reinforced by Carbon Fiber/Graphene Oxide

“…Phosphate-bonded coatings are used as antiwear materials to protect metal parts in aero-engines, pressurized gas engines, micro-combustion engines, and missile launchers. , However, under high loads and complex service conditions, the phosphate-bonded coating is prone to fracture, resulting in a reduction in mechanical properties and affecting the integrity and continuity of the lubricant film on the surface, thereby reducing the tribological performance of the coating . To solve this drawback, some functional fillers can be incorporated to improve the properties of the phosphate-bonded coatings.…”

Abrasion-resistant CMAS glass-ceramic coatings incorporated with B4C particles

“…Moreover, abrasion is dependent on the number of defects, degree of porosity, and surface roughness of the GCCs, where crack nucleation and propagation result in particle debonding and the rupture of GCCs [2,4]. Various types of research on improving the abrasion resistance of GCCs have been reported [4][5][6][7][8][9][10]. These studies can be classified into two main approaches: (i) the alteration of the chemical composition of parent glasses by the application of process additives to reduce the total porosity, and (ii) the incorporation of hard ceramic particles into the GC matrix to prevent fracture propagation [4,[7][8][9][10].…”

“…Various types of research on improving the abrasion resistance of GCCs have been reported [4][5][6][7][8][9][10]. These studies can be classified into two main approaches: (i) the alteration of the chemical composition of parent glasses by the application of process additives to reduce the total porosity, and (ii) the incorporation of hard ceramic particles into the GC matrix to prevent fracture propagation [4,[7][8][9][10]. Process additives of spodumene (LiAl (Si 2 O 6 )), feldspar (K(AlSi 3 O 8 )), zirconium silicate (ZrSiO 4 ), quartz (SiO 2 ), and combinations were investigated as for the first approach, and these additives exhibited a limited improvement of the abrasion resistance [7].…”

“…The development of GCCs with improved mechanical characteristics has received a lot more scientific focus in recent years [4,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, no research on the incorporation of B 4 C particles into GCCs has been done in the literature.…”