Avaliação do desgaste em cilindros de motores de combustão interna - mapeamento de mecanismos e quantificação do desgaste.

Obara, R.B.

doi:10.11606/t.3.2018.tde-23052018-110318

Cited by 4 publications

(12 citation statements)

References 88 publications

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“…Comprehensive thesis research approaching the description of mechanisms of wear of ICE cylinders[107,108,109] support these contextual research results, with abrasion listed between the main mechanisms for wear. Origins an development of sclerometry test to characterize mechanical response of materials are described in[110], which also points the scratch formation as a method of controlled abrasive wear, and reasonable to use for compareabrasive wear resistance of materials, characterize aspects related to deformation and material removal.…”

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confidence: 86%

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Filho¹,

dos²

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A concept of plasma treatment for enhancing pre-textured surfaces of components made in pearlitic gray cast iron is proposed. It consists of a plasma nitriding at low temperatures and short times, in order to increase the hardness of the surface by means of a shallow depth nitride formation in the surface of the iron. As a result, the roughness pattern of a previously textured surface is preserved after the treatment. A review on the wear of internal combustion engine cylinders along with background research was conducted, which consisted in the description of cylinder bore wear features observed experimentally. The background research substantiated the significance of initiatives to enhance wear and friction response of pre-textured surfaces made of cast iron, such as the internal combustion engine cylinders. A series of plasma nitriding experiments was run on specimens extracted from engine cylinders. Flat specimens, obtained from blanks extracted from the cylinder wall of an engine cylinder block, were textured in laboratory in order to emulate the typical roughness distribution of an ordinary cylinder bore plateau honing process. Complementarily, a case-study experiment was performed in a honed sample of an internal combustion engine cylinder, whose surface in its original form (cylindrical) has been textured through industrial honing operations. Therefore, one among the potential applications of the research has been assessed. 3-D interference roughness measurements were performed before and after the plasma treatment to assess topographic stability of the textured surfaces. ε-Iron nitride (Fe 3 N) formation was identified via X-ray diffraction analysis. In addition, nitrogen concentration profile was quantitatively evaluated using wavelength-dispersive (X-ray) spectroscopy microanalysis, substantiating the nitride formation at shallow depth. Microhardness measurements and instrumented linear sclerometry test ('scratch test') results indicated that ε-iron nitride formation and solid solution hardening could provide enhanced properties to the surface of general pearlitic cast iron components, such as increase of wear resistance, and decrease of apparent coefficient of friction, in the assessed conditions. The results demonstrated that the roughness texture pattern was satisfactorily preserved after the treatment, which was supported by direct observation of the surfaces via scanning electronic microscopy.

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confidence: 86%

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Filho¹,

dos²

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“…[Graham, 1972] Figura 2.15 -Deslizamento de uma cunha rígida bi-dimensional da direita para a esquerda sobre material perfeitamente plástico. Deformação segundo três modos: a) corte, b) formação de proa e c) sulcamento [Challen 1983 [Obara, 2015] Com a pressão da sociedade para o uso de motores mais eficientes e menos poluentes, o problema da perda de energia pelo processo abrasivo e da possível …”

Section: Abrasão De Ferro Fundido Cinzento: Aplicação a Motores Automunclassified

Abrasão de ferro fundido cinzento: aplicação a motores automotivos.

Franco¹

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“…A superfície do cilindro é, geralmente, gerada por brunimento que pode ser de vários tipos. Os mais comuns são: "standard honing", "plateau honing", "brush honing", "fluid-jet honing", "laser honing", "slide honing" e "spiral-slide honing" [7]. O bloco usado neste trabalho foi usinado pelo processo de "plateau honing" ou brunimento de platô, que gera áreas de suporte de carga de baixa rugosidade intercaladas por vales profundos, chamados de sulcos de brunimento.…”

Section: Sistema Anel/cilindrounclassified

“…Cilindros usinados pelo brunimento de platô normalmente levam a um menor consumo de óleo e diminuem o risco da ocorrência de "scuffing" (desgaste severo por deslizamento) [7] e desgaste tanto do cilindro quanto do anel [5,10], quando comparados com cilindros usinados por "standard honing".…”

Section: Sistema Anel/cilindrounclassified

“…Figura 5 -Curva de Stribeck mostrando os regimes de lubrificação experimentados pelo sistema anel/cilindro e outros sistemas tribológicos do motor [12] Segundo Sudarshan e Bahduri [111], os principais mecanismos de desgaste em cilindros de motores são adesão, scuffing, abrasão e corrosão, sendo que, na opinião dos autores o desgaste é governado principalmente pelo mecanismo de adesão. Obara [7], estudando os mecanismos de desgaste atuantes no cilindro de um motor flex-fuel concluiu que os mecanismos predominantes são os de abrasão e o desgaste associado a reações triboquímicas e que a adesão e a fadiga de contato têm importância secundária. Santos Filho [12]…”

Section: Sistema Anel/cilindrounclassified

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Caracterização do desempenho tribológico de ferros fundidos utilizados na fabricação de blocos de motores de combustão interna.

Siebert¹

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Avaliação do desgaste em cilindros de motores de combustão interna - mapeamento de mecanismos e quantificação do desgaste.

Cited by 4 publications

References 88 publications

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Abrasão de ferro fundido cinzento: aplicação a motores automotivos.

Caracterização do desempenho tribológico de ferros fundidos utilizados na fabricação de blocos de motores de combustão interna.

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