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首页> 外文OA文献 >The selection and testing of compression seal and chamber coating materials for the pivotal engine™.
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The selection and testing of compression seal and chamber coating materials for the pivotal engine™.

机译：枢轴发动机™的压缩密封和腔室涂层材料的选择和测试。

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摘要

Wear and friction tests were conducted on a rotational tribometer to identify materialcouples for compression seals and chamber coatings to extend the service life of thePivotal Engine™. Potential materials were identified based on reports in the literatureof successful use in similar environments. From the rotational tribometer tests, thebest material couple was found to be reaction bonded silicon nitride against a SulzerMetco F4301 plasma sprayed coating followed by a Total Seal TiN coated sealagainst the F4301 coating. However, the performance predicted by the rotationaltribometer was not realised in a fired engine, where the TiN coated seal wore almostas fast as an uncoated seal. This discrepancy was due to the large differences inoperating conditions between the rotational tribometer and the fired engine,particularly the reciprocating motion of the engine. The different operating conditionsmean that the results from the rotational tribometer have little or no relevance actualperformance in the engine.To overcome the limitations of the rotational tribometer a reciprocating tribometerwas designed and built. The performance predicted by the reciprocating tribometerwas much closer to the observed wear rates from the engine, particularly with theTotal Seal TiN coated seals. Some of the results from the reciprocating tribometerwere a direct-contradiction to those obtained on the rotational tribometer. When testedon the rotational tribometer the nitrided stainless steel seal wear rate was lower thanthat of the Mazda cast iron seal. However, on the reciprocating tribometer the Mazdacast iron seal had a lower wear rate than the nitrided stainless steel seal. From thetesting conducted on the reciprocating tribometer the best material couple was foundto be Total Seal TiN coated seals on the F4301 chamber coating. However, thismaterial couple cannot be recommended to increase the seal life in the PivotalEngine™ because at the conclusion of a twenty hour test the Total Seal TiN coatinghad worn through to the substrate. In addition to testing different materials, differentoils were tested while keeping the wear couple constant. The oil that offered the bestwear protection to both the seal and chamber coating was Castrol A747. These testsshowed that different oils have as much effect as different materials.Even with the best material combinations (Total Seal TiN seal, F4301 chambercoating) the seal wear rates in the Pivotal Engine™ are much higher than would beexpected in other engines. This leads to the hypothesis that the origin of high sealwear in the Pivotal Engine™ is not due to material properties, but to design issues.The most likely problem is distortion of the chamber, which causes high localised sealloadings, and in turn causing high seal wear.
机译：在旋转摩擦计上进行了磨损和摩擦测试，以确定用于压缩密封和腔室涂层的材料偶，以延长Pivotal Engine™的使用寿命。根据在类似环境中成功使用的文献中的报告，确定了潜在的材料。从旋转摩擦计测试中，发现最佳的材料对是氮化硅与SulzerMetco F4301等离子喷涂涂层的反应结合，然后是针对F4301涂层的Total Seal TiN涂层密封。但是，旋转摩擦计所预测的性能在带有TiN涂层的密封件的磨损速度几乎与未涂层的密封件一样快的射击发动机中无法实现。这种差异是由于旋转摩擦计和点火发动机之间的工作条件差异很大，尤其是发动机的往复运动。不同的工况意味着旋转摩擦计的结果与发动机的实际性能几乎没有相关性。为克服旋转摩擦计的局限性，设计并制造了往复式摩擦计。往复式摩擦计预测的性能非常接近于发动机观察到的磨损率，特别是使用Total Seal TiN涂层密封件。往复式摩擦计的某些结果与旋转式摩擦计的结果存在直接矛盾。在旋转摩擦计上测试时，渗氮不锈钢密封件的磨损率低于马自达铸铁密封件。但是，在往复式摩擦计上，Mazdacast铁密封件的磨损率低于渗氮不锈钢密封件。通过在往复式摩擦计上进行的测试，发现最佳的材料对是F4301腔室涂层上的Total Seal TiN涂层密封。但是，不建议使用这种材料来延长PivotalEngine™的密封寿命，因为在进行了20小时的测试后，Total Seal TiN涂层一直磨损到基材。除了测试不同的材料外，还测试了各种油，同时保持了恒定的磨损系数。为密封件和腔室涂层提供最佳磨损保护的油是嘉实多A747。这些测试表明，不同的机油与不同的材料具有同等的效果。即使采用最佳的材料组合（Total Seal TiN密封件，F4301室内涂层），Pivotal Engine™的密封件磨损率也比其他发动机预期的要高得多。这导致一个假设，即Pivotal Engine™中高密封磨损的根源不是由于材料性能，而是由于设计问题。最可能的问题是腔体变形，这会导致较高的局部密封载荷，进而导致高密封穿。

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    Miller David J;

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  • 年度 2006
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  • 正文语种 en
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