PSZ Ceramics for Adiabatic Engine Components

Woods, Melvin; Oda, Isao

doi:10.4271/820429

Cited by 32 publications

(4 citation statements)

References 4 publications

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“…Advanced coatings that show excessive variability and unpredictability at the required engine operating conditions will not be employed, regardless of their potential benefits to the system. For example, thermal barrier coatings (TBCs) are currently used to improve the performance of several engines [9]. In ceramic coatings, the coating layer provides wear resistance, while the substrate ensures resistance against thermal and mechanical shocks.…”

Section: Ceramic Coating Processesmentioning

confidence: 99%

Surface properties of CrN coated engine cylinders

2009

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Section: Ceramic Coating Processesmentioning

confidence: 99%

Surface properties of CrN coated engine cylinders

2009

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“…There are two types of stresses that may be considered in the design of a ceramic tube to metal and/or ceramic interface. They are tensile hoop stress on a tube (Figure 15a) and compressive hoop stress on the tube (Figure 15b) If the nominal outside diameter of the tube is 100.95 mm (3.9746"), then Ad = 9.6 X 10 "1 mm (3.78 x lO^^in) [29] max 'Ĥ owever, if the contact is not perfect and only 1/10 of the area contacts, then Ad = 9.60 X 10 "2 (3.78 x 10"^i n) [30] max Finally as an added measure of safety, an engineering safety factor is added to insure that parts do not crack. Therefore for a tube in compression Ad = 7.06 x 10"^m m (2.78 x 10"^i n), max Similarly, for tensile stress on the tube: a = 350 X 10^P a [31] max € = 410 X 10^P a [32] Ad a 350 X 10ê -max -max = [33] '"^'^d E 410 X 109 Ad = 8.10 X 10'2 mm (3.19 x 10'^i n.) if all area contacts.…”

Section: Silicon Carbidementioning

confidence: 99%

The design and construction of a state-of-the-art high temperature tribometer

Yellets¹,

Hsu²,

Klaus³

1988

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encouraged and sponsored graduate cooperative programs in which promising young scientists (some of them NBS staff members) come to NBS to conduct research, part of which often becomes the graduate's thesis.While it is not the objective of NBS to teach and train graduate students , such a program often furthers NBS programmatic goals by attracting high caliber scientists working on areas where NBS mission lies. Many excellent research papers have results and many students, upon graduation, have chosen to stay at NBS to continue their research careers.Such programs also draw many first rate university professors to NBS through the participation of these students in NBS research programs and projects, thus fostering NBSuniversity interactions and enhancing the scientific caliber of the work and reputation at NBS and the participating university. At the same time, through the frequent contacts that NBS has with industries, a natural university/government lab/industry relationship evolves, bringing a team focus on many research projects of significant economic and/technological impacts. When appropriate, the students were supported by ECUT for some time.To this, we gratefully acknowledge the generous support of DOE ECUT, without whose support many ideas would not be explored.Stephen M. Hsu Chief, Ceramics Division ABSTRACT High temperature ceramic tribology is one of the fastest growing and least understood areas in tribology. The need to understand the mechanisms of friction and wear for ceramic materials is critical.Ceramic materials are being utilized in tool development, bearing design, materials development for low-heat-rejection diesels, automotive gas turbines, Stirling engines, and aerospace applications. Recommendations for future work on high temperature wear mechanisms of ceramic materials and the tribological testing of such materials are presented at the conclusion of this work.

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“…Coatings must maintain their performance on a continued and reliable basis, or the performance of the turbine system could be compromised [2]. In ceramic coatings, the coating layer provides wear resistance, while the substrate ensures resistance against thermal and mechanical shocks.…”

Section: Introductionmentioning

confidence: 99%

Effect of abrasive particle sizes on abrasive wear of ceramic coatings sprayed by plasma process

Gök

Gençel

Koç

et al. 2011

Powder Metall Met Ceram

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This study examines the effects of abrasive grain size on abrasive wear behaviors on surfaces coated with different types of ceramics. To this end, the surface of AISI 1040 steel is coated with the ceramic materials of 5% SiO 2 -3% TiO 2 -92% Cr 2 O 3 , 60% Al 2 O 3 -40% TiO 2 , pure Al 2 O 3 and 87% Al 2 O 3 -13% TiO 2 using the plasma method. Following the coating process, the abrasive wear resistance of each sample is tested by the ring-on-disc method. 80-220 mesh SiC abrasive paper is used as abrasive. The best wear resistance is obtained with the ceramic coating containing 92% Cr 2 O 3 , which is followed by pure Al 2 O 3 and 87% Al 2 O 3 -13% TiO 2 , respectively. The lowest wear resistance is observed in 60% Al 2 O 3 -40% TiO 2 ceramic coating. Wear resistance of the samples increases with increasing hardness value and decreasing abrasive grain size. It is observed that wear mechanisms occurring on the samples' wear surfaces change with changing abrasive grain size. Wear mechanisms such as microscratching, microcracking, and plastic deformation are observed in the samples.

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PSZ Ceramics for Adiabatic Engine Components

Cited by 32 publications

References 4 publications

Surface properties of CrN coated engine cylinders

Surface properties of CrN coated engine cylinders

The design and construction of a state-of-the-art high temperature tribometer

Effect of abrasive particle sizes on abrasive wear of ceramic coatings sprayed by plasma process

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