Low Friction in Mechanical Seal of SiC Sliding against Itself in Water (Part 1)

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  • FUKUHARA Takuto
    Material Engineering Department, Engineering Division, Eagle Industry Co., Ltd.
  • UEMURA Norio
    Engineering Division, Eagle Industry Co., Ltd.
  • ADACHI Koshi
    Department of Mechanical Systems Engineering, Tohoku University

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Other Title
  • 炭化ケイ素同士のメカニカルシール型面接触における水中低摩擦発現（第1報）
  • 炭化ケイ素同士のメカニカルシール型面接触における水中低摩擦発現(第1報)すべり軸受型面接触との相違
  • タンカ ケイソ ドウシ ノ メカニカルシールガタメン セッショク ニ オケル ミズ ナカビク マサツ ハツゲン(ダイ1ポウ)スベリ ジクウケガタメン セッショク ト ノ ソウイ
  • ―Differences from Sliding Bearing Plane Contact―
  • ―すべり軸受型面接触との相違―

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Abstract

<p>In recent years, reduction of frictional energy loss at sliding surfaces is required for mechanical seals to prevent leakage of seal liquid. However, it was not easy for the complicated frictional phenomena of mechanical seal because of difficulty of removing the wear products from the sliding surface and supplying lubricant to the sliding surface. In this paper, SiC (silicon carbide) plane contact frictional tests were carried out with mechanical seal type and bearing type in water. Low friction coefficient of 0.05 or less was achieved under boundary lubrication with mechanical seal type, and the behavior of the friction coefficient during the running-in process was significantly different from that of the bearing type. Compared to the bearing type, the low friction of the mechanical seal type generated under more limited friction conditions. The low-friction sliding surface was smooth surface with a 4 nm thick nano-interface and the deposition of wear products composed of carbon, oxygen and silicon in the pores. It was found that the wettability of low friction sliding surface was better than that of sliding surface of running-in, and good wettability leads to a lower friction coefficient.</p>

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