Porous ceramic for use in slide member and its manufacturing method and mechanical seal ring using it

Abstract

A porous ceramic for sliding members having independent pores of pore size not smaller than 5 [mu]m. The pores are compressed flatly in the direction perpendicular to the sliding surface. The cross-directional area (S1) of each pore in the direction is 95% or less of the area (S2) when the cross-section of the pore is a true circle. The ratio (P75 / P25) of the cumulative 75 vol% pore size (P75) tothe cumulative 25 vol% pore size (P25) is 1.9 or less in the cumulative distribution curve of pore size of the independent pores in a plane parallel to the sliding surface. This porous ceramic can besuitably utilized for a sliding member such as a seal ring.

Description

technical field [0001] The present invention mainly relates to porous ceramics for forming sliding members such as seal rings in mechanical seals used as shaft seals for automobile cooling water pumps and refrigerators, and methods for producing the same. Background technique [0002] As an example of the use of the porous ceramic for sliding members, a (mechanical) seal ring used in a mechanical seal is mentioned. The so-called mechanical seal is one of the shaft seal devices of fluid equipment for the purpose of completely sealing the fluid of the rotating parts of various machines. The ring structure has a vibration-absorbing mechanism, and plays the role of restricting fluid leakage on the sliding surface approximately perpendicular to the relatively rotating shaft. [0003] The basic structure of the mechanical seal is as follows: figure 1 As shown, the seat ring 5 and the driven ring 6 constituting the sealing ring are installed between the rotating shaft 1 and the h...

AI Technical Summary

Problems solved by technology

In addition, when the friction of the sliding contact surface is serious after long-term sliding operation, the grooves and processing scratches disappear, and when the surface with few pores introduced by the pore-forming material appears, the actual sliding area increase, the supply of lubricant cannot be performed sufficiently, and the problem of increased slip torque occurs

In addition, when the porosity is large, if the dispersion of the pores is insufficient, the possibility of becoming through pores increases. Therefore, the prior art tends to suppress the porosity, and sufficient lubricity cannot be ensured in many cases.

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