Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | ADA621803 |
| Environmental Degradation of Nickel-Based Superalloys Due to Gypsiferous Desert Dusts. | |
| Krisak, M. B. | |
| 英文摘要 | More than twenty-five years of continuous operation in the dusty environments of Southwest Asia have shown that degradation of gas turbine engine components due to particle ingestion is a serious threat to operations. In particular, the continued push for higher engine operating temperatures has brought a new emphasis to the damage mechanisms (for example CMAS glass formation and hot corrosion) caused by ingested particles forming molten deposits on engine components. Despite decades of research little progress has been made to mitigate the effects of CMAS and hot corrosion degradation to engine components. This research focused on hot corrosion specifically. A ground-up review of real-world incidents of hot corrosion revealed that the chemical species (sodium sulfate), cited as the cause of hot corrosion in all current academic study, is not present in any natural environment where hot corrosion is an issue. This fact alone raises serious concerns as to the real-world applicability of more than 40 years of laboratory study. An alternative species (gypsum) was identified which is abundant across the globe, and in particular is found in the locations the DoD has reported hot corrosion. Testing proved that gypsum is molten at the same temperatures as sands from a location known to cause significant hot corrosion degradation. Gypsum was proven to initiate hot corrosion at temperatures associated with modern gas turbine engine operation, which are beyond the range at which sodium sulfate can cause degradation. A first-of-its-kind model was developed to predict degradation caused by gypsiferous dusts as a function of temperature, sulfate concentration, and time. The model was based on kinetic rate law equations and was validated by comparison to additional laboratory runs. The model suggests a minimum concentration of sulfate is necessary to cause hot corrosion, beyond which temperature and time-at-temperature become the chief predictors of degradation. |
| 英文关键词 | Degradation Dust Gypsum Nickel Silicates Superalloys Corrosion Deserts Failure(mechanics) Gas turbines Internal combustion engines Substrates Sulfur Theses Environmental degradation Nickel-based superalloys Gypsiferous dese |
| 出版年 | 2015 |
| 语种 | 英语 |
| 国家 | United States |
| 来源学科分类 | 48F - Geology & Geophysics ; 71N - Nonferrous Metals & Alloys ; 46E - Structural Mechanics |
| URL | http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=5a025ac631c97d1c38a6faf8 |
| 来源机构 | Non Paid ADAS |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/274012 |
| 推荐引用方式 GB/T 7714 | Krisak, M. B.. Environmental Degradation of Nickel-Based Superalloys Due to Gypsiferous Desert Dusts.,2015. |
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