在合成多过滤液中佩戴金属分析

Synthetic polyester fluids are formulated for use in aircraft gas turbine engines to deal with a vast range of extreme operating conditions. The factory supplied M/N program for compliance with the JOAP program uses D12 and D19 standards which are prepared from a mineral oil hydrocarbon base stock. The Spectroil analyzer provides the option to create a new calibration program with matrix-specific elemental standards for applications which require enhanced accuracy for non-mineral oil based fluids.

介绍

合成多元酯液are the preferred fluids to lubricate aircraft gas turbine engines that are used in military and commercial service requiring MIL-PRF-23699F-STD level performance. These synthetic lubricants are also used for aircraft-type gas turbine engines in industrial or marine service applications.

这些流体的配制是满足飞机型燃气轮机在各种极端运行条件下运行的挑战性要求。它们具有巨大的热和氧化稳定性,可以降低污泥和清漆沉积物,并且具有很高的特异性热量。另外,润滑剂可在广泛的温度范围内(-40°C至204°C或-40°F至400°F)保持粘度和膜强度。

当这些流体在A上测试时光谱已经用基于矿物质的油标准校准的,样品中可能会有基质效应。在市售的矿物油磨损金属标准中,可能不会考虑这种影响。尽管保持了校准的趋势能力,但样品矩阵的显着差异可以改变结果的准确性。用户可以使用自定义或矩阵特定的元素标准为应用程序的应用程序创建定制校准程序,这些应用程序非常必要或矩阵效果很严重。

合成多元酯液

背景

对测试标准(C0,C5,C10和C20的0、5、10和20 ppm金属元素)和磨损金属的饮食式合成燃气涡轮润滑剂的未知样品进行了分析。合成油类型为MIL-PRF-23699F,北约代码O-156/O-152,它是基于多元酯的流体。使用Factory Spectroil M/N计划运行样品和测试标准,以使用基于矿物油的D19和D12标准来遵守JOAP计划。对于JOAP矿物油的标准标准D19-0 ppm,D12-5 ppm和D12-10 ppm,该仪器得出了准确的结果,但没有为合成测试标准提供令人满意的结果(表1)。

表格1。根据JOAP M/N标准获得的数据和提供的测试标准。

M/N PROGRAM
Sample al Cr 毫克 pb
D19-0 0.06 0.02 0.00 0.00 0.07 0.18
D12-5 5.18 5.28 5。68 5。62 5。56 6。61
D12-10 10.25 10.76 11.17 11.29 10.84 11.34
C0 0.00 0.00 0.12 0.01 0.34 1。03
C5 5。92 5。82 8.66 8.86 8.12 9.31
C10 14.75 14.58 20.71 22.64 18.61 21.53
C20 30.45 29.57 42。47 47.50 36。17 45.34

与已知的元素浓度相比,测试标准报告的元素浓度明显更高。由此可以得出的结论是,与矿物基碳氢JOAP标准相比,合成涡轮机油之间基质的差异是由于基质之间的差异。可以创建新的校准以提高准确性。

方法

使用提供的测试标准,可以创建校准。但是,使用相同的基质油制备了一组独立的校准标准,以进行更强大的分析。通过仔细稀释D19-900 ppm油标准在合成油基O-156/O-152中,以0的浓度为0,制备一组合成涡轮油标准品(Syngt-0 ppm,Syngt-0 ppm,Syngt-50 ppm等),以0的浓度为0,5、10、20、30、50和100 ppm。

创建新的校准程序

创建新的校准程序

创建新的校准程序

图1。创建新的校准程序using an existing program as a template.

A new calibration program SYNGT was developed by copying the existing M/N program on the Spectroil which is shown in Figure 1. The Standardization Sample Names SYNGT-0, SYNGT-5, SYNGT-10, SYNGT-20, SYNGT-30, SYNGT-50, and SYNGT-100 were added at the end of the list under System >> Standardization Samples which is shown in Figure 2.

将新的标准化样本添加到自定义校准程序中。

将新的标准化样本添加到自定义校准程序中。

图2。将新的标准化样本添加到自定义校准程序中。

然后,根据手册中的标准操作说明进行日常操作,按照准备的标准执行校准程序。

  1. Three warm up burns
  2. Profile
  3. 圆盘偏移过程
  4. 5燃烧0 ppm(O-156/O-152油)以设置参考值
  5. 5burns of each prepared standard: 0 ppm, 5 ppm, 10 ppm, 20 ppm, 30 ppm, 50 ppm, 100 ppm.

In Intensity Ratio mode, the results for five burns of each prepared standard were examined and then recorded. These values were entered as the calibration curves and the expected standardization values in the channel configuration screen in the SYNGT program for each element in the list, as shown in Figure 3. The fields with D-19 standards were replaced with the appropriate SYNGT standards. All other fields were left similar to the template M/N program. The channel configuration changes were saved by clicking ok.

calibration curve for Ag and the channel configuration screen

calibration curve for Ag and the channel configuration screen

图3。AG和通道配置屏幕的示例校准曲线。

Results

建立了Syngt程序并进行正式校准后,进行了日常标准化例程,并使用SYNGT标准的四个燃烧确认了标准化。使用SYNGT标准制成的支票燃烧在可接受的限制之内。然后,使用SYNGT程序分析了提供的合成涡轮机油测试标准(C0,C5,C10,C20)。表2显示了结果。

Table 2.SYNGT程序校准后,用于SYNGT标准的示例数据和提供的测试标准。

SYNGT PROGRAM
Sample al Cr 毫克 pb
SYNGT-0 0.00 0.07 0.00 0.00 0.03 0.41
SYNGT-5 5.19 5.08 5.08 5。30 5.08 5。82
Syngt-10 10.10 10.14 10.15 10.40 10.60 10.94
Syngt-20 21。11 20.59 19.98 21。08 20.95 21。32
C0 0.02 0.00 0.00 0.00 0.01 0.00
C5 4。73 4.46 4。72 4.52 4。92 4.09
C10 11.36 11.30 11.56 11.41 12.01 11.15
C20 23。69 22.62 21.92 23.28 23.15 25。78

The test standards were within an agreeable range of the known value (0, 5, 10, 20 ppm) using the new SYNGT program. Unknown turbine samples could now be analyzed with a certainty of the accuracy of the result.

Conclusion

When an elemental analysis is performed on the光谱,通常,使用适当的工厂提供的程序和元素标准是足够的。然而,当准确性在趋势或特定应用中特别重要时,使用矩阵特定元素标准的新校准程序可能至关重要。可以使用当前的工厂提供的程序作为模板来容易生成自定义的校准程序。然后,新的校准程序可用于以增强的精度调查样品。

Spectro Scientific

此信息已从Ametek Spectro Scientific提供的材料中采购,审查和改编。亚博网站下载

For more information on this source, please visitAmetek Spectro Scientific。

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