JPS6212936Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a composite carbon material for mechanical seal sliding material.

Usually, the sliding members of a mechanical seal have one ring member a that has a relatively wide sliding surface and high hardness, and the other that has a protrusion that has a relatively narrow sliding surface and low hardness, as shown in Fig. 1. The ring member b is configured to slide into contact with the ring member b, and both sliding surfaces are finished with extremely precise flat surfaces so that they slide smoothly and no fluid leaks across the sliding surfaces. When actually used, the sliding surface is slightly distorted due to the effects of pressure, temperature, etc., making it more likely to leak. Therefore, in general, the sliding surface of ring member b is made of a soft (low Young's modulus) material such as carbon so that even if one ring member a is slightly distorted, the other ring member b will follow that of ring member a. Therefore, the wear due to sliding is rapid, which shortens the life of the mechanical seal.

In view of the above problems, the present invention consists of a ring member that has a high hardness on the sliding surface and is soft in the axial direction (low Young's modulus), and is a mechanical seal sliding member that maintains the sealing effect and has excellent wear resistance. The purpose is to provide composite carbon materials for materials.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 2 and 3 show a composite carbon material, and an annular body 1 made of carbon material.
An annular sliding protrusion 2 having an appropriate width is formed on one end surface, and the end surface of the sliding protrusion 2 constitutes an extremely precise sliding surface 3, and a Extremely hard, thickness 0.1~10μ,
It is an insert structure in which silicon carbide scale-like minute pieces 4, 4, .

The above configuration is effective when molding the main body 1 by a molding method. First, as shown in FIG. After that, scale-like minute pieces 4, 4... are sprinkled thereon. By this scattering, the scale-like minute pieces 4, 4, . . . are distributed substantially parallel to the bottom step 6 of the mold 5 by their own weight, and the mixed powder 7 of synthetic resin and carbon is again spread thereon and compacted. Next, scale-like minute pieces 4, 4...
..., after the mixed powder 7 of synthetic resin and carbon is alternately sprinkled and compacted to obtain a laminated layer of appropriate thickness,
As shown in FIG. 6, the entire mold 5 is filled with a mixed powder 7 of synthetic resin and carbon, the mold 8 is closed, and the mold is pressed and heated.

In the composite carbon material molded as described above, the hard scale-like minute pieces 4, 4... inserted into the sliding contact projections 2 are approximately parallel to the sliding surface 3, which is a characteristic of the carbon material in the axial direction. It exhibits its softness (low Young's modulus) as it is, can effectively cope with the distortion of the hard ring member a that slides on the opposite side, and has the same sealing performance as ordinary carbon. In addition, the scale-like minute pieces 4, 4... are exposed on the sliding surface 3, and wear resistance is exceptionally improved in sliding contact with the ring member a, resulting in excellent durability. It is.

As explained above, the composite carbon for mechanical seal sliding materials of the present invention has excellent wear resistance due to the high hardness of the sliding surface, and at the same time has a laminated structure with a low Young's modulus in the axial direction. It has the characteristics of easily following the distortion of the contact material and has a large sealing effect, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

The drawings show an embodiment of the composite carbon material for the mechanical seal sliding material of the present invention. Figure 1 is a front sectional view showing the sliding ring of a conventional mechanical seal, and Figure 2 is a cross-sectional view of the sliding ring of the present invention. 3 is a sectional view taken along the line A-A in FIG. 2, FIG. 4 is a perspective view of scale-like particles, and FIGS. 5 and 6 are schematic views of the main parts of the mold showing the same molding state. FIG. a, b... Ring member, 1... Main body, 2... Sliding protrusion, 3... Sliding surface, 4... Scale-like minute piece,
5...Mold, 6...Bottom section, 7...Mixed powder of synthetic resin and carbon, 8...Press mold.

Claims (1)

[Claims for Utility Model Registration] (1) In a carbon member constituting a sliding member of a mechanical seal that comes into sliding contact in the axial direction with a hard ring member made of cemented carbide, the entire carbon member or the sliding contact A composite carbon material for a mechanical seal sliding material, characterized in that a large number of highly hard scale-like pieces of silicon carbide are arranged on the protrusion or a part thereof in a laminated manner substantially parallel to the sliding surface. (2) The composite carbon material for mechanical seal sliding material according to claim 1, wherein the scale-like minute pieces have a thickness of about 0.1 to 10 μm and a size of about 10 to 1000 μm.