Increasing of durability of mechanical seals of oil and gas centrifugal pumps using tungsten-free cermet with Cu-Ni-Mn binder

Abstract

The rational materials selection for friction pairs is an important prerequisite in promoting of reliable operation of mechanical seals used in centrifugal pumps. The experience of mechanical seals exploitation shows that most preferable is combination of “hard” and “soft” materials. As “hard” materials ceramics based on SiC, Al2O3, Si3N4, are the most commonly employed and for “soft” materials metal alloys, composites and carbon materials are widely used. In this study chromium carbide based composite metal-ceramic material with copper-nickel-manganese binder was developed for using in mechanical seals rings friction couples with silicon carbide (SiC) ring. Metal-ceramic sealing rings were manufactured by infiltration of pre-sintered porous chromium carbide skeletons with Cu60-Ni20-Mn20 melt at 1150 °C in protective (argon) atmosphere. Results of experimental investigations and theoretical modelling of heat transfer during friction, show significant advantages of proposed materials combination over ceramic-ceramic pairs through its better tribological characteristics and resistance to thermal shock. Industrial testing allows us to conclude that using of mechanical seal rings of proposed materials combination almost completely prevents failures of sealing rings surfaces caused by thermal cracking.

Soft Sensor Technology for the Determination of Mechanical Seal Friction Power Performance

“…The studies' findings can aid in the development of a soft sensor. T. A. Shihab et al demonstrated that the selection of an appropriate material combination for mechanical seal rings can effectively reduce the sliding face temperature during dry running compared with alternative material combinations [14]. They calculated the temperature fields in the mechanical seal analytically.…”

Analytical study of heat transfer through friction overlay of band-pad brakes

“…Theoretical approaches to the development of the composition of new composite materials and strengthening technologies are proposed in [26,27]. Researchers [28] developed a method of thermodynamic prediction of the phase composition of high-entropy alloys of transition metals for parts of friction nodes, including tungsten-free ones [29]. It is promising to use composite oxide coatings formed by plasma electrolytic oxidation in an electrolyte at high voltages [30,31] to strengthen the operational surfaces of disks and drums made of aluminum and titanium alloys.…”

Effect of Incomplete Replacement of Cr for Cu in the Deposited Alloy of Fe–C–Cr–B–Ti Alloying System with a Medium Boron Content (0.5% wt.) on its Corrosion Resistance

“…The use of surfacing technologies allows to combine rationally the properties of coating materials and bases [4][5][6], providing the necessary accuracy of the parts manufacture [7]. Coating materials are used to increase the wear resistance, corrosion resistance and crack resistance of products [8][9][10].…”