Spark-plasma-sintered ZrO2(Y2O3)-BaCrO4 self-lubricating composites for high temperature tribological applications

Ouyang, Jia‐Hu; Sasaki, Shinya; Murakami, Takashi; Umeda, Kazunori

doi:10.1016/j.ceramint.2004.06.020

Cited by 56 publications

(32 citation statements)

References 12 publications

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“…In samples containing barium (x = 0 to 0.10) barium secondary phases BaMnO 4 and BaCrO 4 were found, indicating that higher calcination temperatures do not increase the solubility of Ba in LaCrO 3 . 27 In samples with higher strontium content (x = 0.20), traces of La 2 O 3 appear after sintering at higher temperatures (1300°C to 1500°C). In samples containing calcium (x = 0 to 0.15), no particular calcium or strontium secondary phases were found after sintering at 1200°C and also at higher sintering temperatures.…”

Section: Resultsmentioning

confidence: 99%

Novel materials based on La0.75SrxA0.25-xCr0.5Mn0.5O3 (A=Ba, Ca, Mg) as full-ceramics anodes in high-temperature fuel cells

Skalar¹,

Marinšek²,

Zupan³

2018

Mater. Tehnol.

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Among alternative anode materials for high-temperature fuel cells, the complex ceramic oxide La0,75Sr0,25Mn0,5Cr0,5O3 (LSCM) has recently shown good catalytic activity regarding fuel oxidation and sufficient stability in reductive environments at relatively low steam-to-carbon ratios. However, the electrical and ionic conductivities of LSCM are lower compared to some other perovskite materials. One of the possibilities to improve the conductivity of LSCM is in its composition variations, i.e., altering the Sr-content, doping on the A-site of the perovskite with other ions (Ba, Ca and Mg), and varying the Mn-to-Cr ratio on the B-site of the perovskite. In this paper, systems with the general formula La0.75SrxA0.25-xCr0.5Mn0.5O3 (A = Ba, Ca, Mg, x varies between 0 and 0.25) are described. Within the investigated system, prepared materials after synthesis contain the perovskite structure as a main crystallographic phase with relatively low additions of secondary phases. Any secondary phases are undesired, because they may substantially influence the electrical properties of the final materials. In samples with relatively high Sr-additions, a secondary Sr-rich phase Sr2CrO4 is also identified. Ca-doping may result in traces of CaCr2O4 phase in as-synthesized samples, while Ba-doping may lead to BaCrO4 or BaCO3 phases with higher Ba-additions. The quantity of the secondary phases may be controlled by calcination program or sintering conditions. Secondary phases, which may form additional grains or liquid phase, also influence the development of microstructures during sintering. Within the investigated compositions, the most promising materials are La0.75SrxCa0.25-xCr0.5Mn0.5O3 (x = 0.05-0.15), because they exhibit single-phase microstructure with fine grains after sintering at 1200°C. Materials with Ba-or Mg-additions form precipitates of secondary phases at 1200°C, which also remain present after sintering at higher temperatures. Keywords: combustion synthesis, perovskite, thermal analysis, x-ray powder diffraction, quantitative microstructure analysis La0,75Sr0,25Mn0,5Cr0,5O3 (LSCM) je med alternativnimi anodnimi materiali za visokotemperaturne gorivne celice pokazal dobro katalitsko aktivnost za oksidacijo goriva ter zadovoljivo stabilnost v reduktivnih okoljih z relativno nizkim razmerjem med vodno paro in ogljikom. Vendar pa ima LSCM v primerjavi z nekaterimi drugimi perovskiti nekoliko ni`jo elektri~no in ionsko prevodnost. Ena od mo`nosti za izbolj{anje njegove prevodnosti je v variacijah sestave, npr. sprememba koncentracije Sr, dopiranje na A mestu v perovskitu z drugimi ioni (Ba, Ca in Mg), variiranje razmerja med Mn in Cr na B mestu v perovskitu. V prispevku obravnavamo sistem s splo{no formulo La0.75SrxA0.25-xCr0.5Mn0.5O3 (A = Ba, Ca, Mg, x variira med 0 in 0,25). Materiali v preiskovanem sistemu po sintezi kot glavno fazo vsebujejo perovskit z relativno nizko vsebnostjo sekundarnih faz. Kakr{nekoli sekundarne faze so neza`elene, ker lahko bistveno vplivajo na elektri~ne lastnosti kon~nih materialov. V ...

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Section: Resultsmentioning

confidence: 99%

Novel materials based on La0.75SrxA0.25-xCr0.5Mn0.5O3 (A=Ba, Ca, Mg) as full-ceramics anodes in high-temperature fuel cells

Skalar¹,

Marinšek²,

Zupan³

2018

Mater. Tehnol.

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“…After wear tests, the wear depth profiles of all the wear tracks were examined by using a surface profilometer. A set of equally spaced depth profiles covering the whole wear track area was used to evaluate the volumetric wear of the composites [9,10]. The morphology and chemical compositions of worn surfaces on Al 2 O 3 -SrSO 4 composites were examined by scanning electron microscopy equipped with energy dispersive X-ray (EDX) analyzer to identify lubrication mechanisms.…”

Section: Characterization and Wear Testsmentioning

confidence: 99%

Tribological Properties of Spark-Plasma-Sintered Al2O3-SrSO4 Self-Lubricating Nanocomposites at Elevated Temperatures

Ouyang

Wang

et al. 2009

Advanced Tribology

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Spark plasma sintering (SPS) is employed to fabricate the self-lubricating Al 2 O 3 -SrSO 4 nanocomposites by tailoring the chemical compositions. Their friction and wear properties have been evaluated using a high temperature friction and wear tester from room temperature to 600 in dry sliding against alumina ball. Nanosized SrSO 4 powders were synthesized by chemical precipitation process at room temperature and atmospheric pressure. For a comparative study, SrSO 4 solid lubricants with different particle sizes are intentionally designed to investigate the influence of size effect on self-lubricating properties of Al 2 O 3 -SrSO 4 nanocomposites under the identical test conditions. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate microstructure and self-lubrication mechanisms of nanocomposites after wear tests at different temperatures. Al 2 O 3 -SrSO 4 nanocomposites with optimum compositional combinations exhibit low and stable friction coefficients of 0.18 to 0.29 and wear rates in the order of 10 -3 to 10 -5 mm 3 /Nm at high temperatures. With increasing test temperature, plastic deformation of SrSO 4 during sliding plays an important role in formation of lubricating films on worn surfaces of nanocomposites. These lubricating films reduce the friction and wear of the Al 2 O 3 -SrSO 4 nanocomposites.

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“…However, till now, the lubricious behavior of BaMoO4 has not been explored in detail. Recently, BaCrO4 has attracted much attention due to its lubricating property at a wide temperature range [62]. BaCrO4 has an orthorhombic structure, and its thermal data shows that the BaCrO4 phase is thermally stable to 850 °C [69,70].…”

Section: Effect Of Solid Lubricant On the Tribological Behaviormentioning

confidence: 99%

“…The high temperature lubricious behavior of some sulfates, chromates, molybdates and tungstates has been extensively studied [60][61][62][63][64][65][66]. Important early work on high-temperature solid lubricant reported that molybdates appeared to be the promising high-temperature solid lubricants [56].…”

Section: Effect Of Solid Lubricant On the Tribological Behaviormentioning

confidence: 99%

“…It was reported that the additives of graphite, MoS2, BaF2, CaF2, Ag, Ag2O, Cu2O, BaCrO4, BaSO4, SrSO4 and CaSiO3 were incorporated into zirconia ceramics, respectively, to evaluate their potentials as effective solid lubricants over a wide operating temperature range [13,[86][87][88]. It was found that the ZrO2 (Y2O3) composites incorporated with SrSO4 exhibited low steady-state friction coefficients of less than 0.2 and small wear rates in the order of 10 −6 mm 3 /Nm at low sliding speed from room temperature to 800 °C.…”

Section: Zirconia Matrix High Temperature Self-lubricating Compositesmentioning

confidence: 99%

See 1 more Smart Citation

High Temperature Self-Lubricating Materials

Bi¹,

Zhu²,

Liu³

2013

Tribology in Engineering

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Spark-plasma-sintered ZrO2(Y2O3)-BaCrO4 self-lubricating composites for high temperature tribological applications

Cited by 56 publications

References 12 publications

Novel materials based on La0.75SrxA0.25-xCr0.5Mn0.5O3 (A=Ba, Ca, Mg) as full-ceramics anodes in high-temperature fuel cells

Novel materials based on La0.75SrxA0.25-xCr0.5Mn0.5O3 (A=Ba, Ca, Mg) as full-ceramics anodes in high-temperature fuel cells

Tribological Properties of Spark-Plasma-Sintered Al2O3-SrSO4 Self-Lubricating Nanocomposites at Elevated Temperatures

High Temperature Self-Lubricating Materials

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