Friction coefficient and abrasive wear modes in ball-cratering tests conducted at constant normal force and constant pressure—Preliminary results

Cozza, Ronaldo Câmara; Tanaka, Deniol Katsuki; Souza, R.M.

doi:10.1016/j.wear.2009.01.055

Cited by 63 publications

(52 citation statements)

References 58 publications

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“…The wear resistance tests were performed using the ball-cratering method on the Calowear tribotester by CSM [24]. The tribological tests were carried out using the ball made of bearing steel ŁH 15, with the diameter 25.4 mm.…”

Section: Wear and Corrosion Testsmentioning

confidence: 99%

Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

Smolik¹,

Mazurkiewicz²,

Kacprzyńska–Gołacka³

et al. 2015

Archives of Metallurgy and Materials

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Magnesium alloys have very interesting physical properties which make them 'materials of the future' for tools and machine components in many industry areas. However, very low corrosion and tribological resistance of magnesium alloys hampers the implementation of this material in the industry. One of the methods to improve the properties of magnesium alloys is the application of the solutions of surface engineering like hybrid technologies. In this paper, the authors compare the tribological and corrosion properties of two types of "MgAl itermetalic / PVD coating" composite layers obtained by two different hybrid surface treatment technologies. In the first configuration, the "MgAl itermetalic / PVD coating" composite layer was obtained by multisource hybrid surface treatment technology combining magnetron sputtering (MS), arc evaporation (AE) and vacuum heating methods. The second type of a composite layer was prepared using a hybrid technology combined with a diffusion treatment process in Al-powder and the electron beam evaporation (EB) method. The authors conclude, that even though the application of "MgAl itermetalic / PVD coating" composite layers can be an effective solution to increase the abrasive wear resistance of magnesium alloys, it is not a good solution to increase its corrosion resistance.Keywords: magnesium alloys, composite layers, electron beam evaporation Stopy magnezu charakteryzują się bardzo interesującymi właściwościami fizycznymi które powodują że, są one określane mianem materiałów przyszłości dla narzędzi oraz elementów maszyn stosowanych w wielu obszarach gospodarki. Ze względu na bardzo niską odporność korozyjną oraz tribologiczną występują trudności we wdrażaniu stopów magnezu do przemysłu. Jedną z metod poprawy właściwości stopów magnezu jest zastosowanie nowoczesnych rozwiązań inżynierii powierzchni. W artykule autorzy porównali tribologiczne oraz korozyjne właściwości dwóch różnych konfiguracji warstw kompozytowych typu "MgAl itermetalic / powłoka PVD" otrzymanych dwoma różnymi metodami hybrydowej obróbki powierzchniowej. W pierwszej konfiguracji warstwa kompozytowa "MgAl itermetalic / powłoka PVD" została otrzymana z wykorzystaniem wieloźródłowej hybrydowej technologii obróbki powierzchniowej, obejmującej połączenie rozpylania magnetronowego (MS), odparowania łukiem elektrycznym (AE) oraz próżniowej obróbki cieplnej. Drugi rodzaj warstwy kompozytowej został otrzymany z wykorzystaniem technologii hybrydowej łączącej proces dyfuzji w proszku aluminium z metodą odparowania wiązką elektronów (EB). Wykazano, że wytwarzanie warstw kompozytowych typu "MgAl itermetalic / powłoka PVD" na stopach magnezu jest efektywnym rozwiązaniem w celu zwiększenia odporności na zużycie ścierne, jednakże nie zapewnia wymaganego zwiększenia odporności korozyjnej tych stopów.

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Section: Wear and Corrosion Testsmentioning

confidence: 99%

Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

Smolik¹,

Mazurkiewicz²,

Kacprzyńska–Gołacka³

et al. 2015

Archives of Metallurgy and Materials

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“…De fato, as primeiras pesquisas publicadas que realmente mediram, na prática, o coeficiente de atrito no sistema tribológico "esfera -partículas abrasivas -corpo--de-prova" foram realizadas pelos Professores Ronaldo Câmara Cozza, Deniol Katsuki Tanaka e Roberto Martins de Souza [4, 13,14]. Com isso, continuando os trabalhos iniciados no então LFS -Laboratório de Fenômenos de Superfície/USP, o objetivo deste trabalho é apresentar uma configuração de equipamento de ensaio de desgaste micro-abrasivo por esfera rotativa livre, hábil a medir o coeficiente de atrito no sistema tribológico "esfera -partí-culas abrasivas -corpo-de-prova".…”

Section: Equipamentos "Ball-cratering": Revisão Literáriaunclassified

“…Tanto o comportamento do volume de desgaste quanto o comportamento do coeficiente de atrito apresentaram concordância qualitativa com a literatura, em que V = f(S) mostra-se linear, indicando a obtenção do Regime Permanente de Desgaste, e µ = f(t) tende a manter-se constante com o tempo de ensaio, como prediz a literatura [4, 13,14]. …”

Section: Conclusõesunclassified

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Projeto, Construção E Validação De Um Equipamento De Ensaio De Desgaste Micro-Abrasivo Por Esfera Rotativa Livre Para a Medição Do Coeficiente De Atrito

Cozza¹,

Suzuki²,

Schön³

2014

TMM

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ResumoO propósito deste trabalho é apresentar uma configuração de equipamento "ball-cratering" para a medição do coeficiente de atrito. Duas células de carga foram utilizadas, de forma a medir, em tempo real, as forças "normal" e "tangencial" durante os ensaios e, a partir destas, calcular o coeficiente de atrito desenvolvido. Para a validação do equipamento projetado e construído, ensaios foram conduzidos sob um corpo-de-prova de aço-ferramenta AISI H10 (temperado e revenido) junto à uma esfera de aço AISI 52100 (temperado e revenido) e solução abrasiva, composta por SiC e água destilada; diferentes valores de força normal e distância de deslizamento foram definidos. Os resultados mostraram que, devido às próprias condições de ensaio, agiu o desgaste abrasivo por rolamento e, em relação ao equipamento desenvolvido, o mesmo apresentou excelente funcionalidade e reprodutibilidade, tanto em relação à formação das calotas de desgaste quanto à medição do coeficiente de atrito. Palavras-chave: Desgaste; Abrasão; Ensaio de desgaste micro-abrasivo por esfera rotativa. DESIGN, BUILDING AND VALIDATION OF A BALL-CRATERING WEAR TEST EQUIPMENT BY FREE-BALL TO MEASURE THE COEFFICIENT OF FRICTION AbstractThe purpose of this work is to present a ball-cratering equipment configuration to measure the coefficient of friction. Two load cells were used to measure, in real time, the "normal" and "tangential" forces during the experiments to calculate the coefficient of friction. Micro-abrasive wear tests were conducted on an AISI H10 tool steel specimen, with a ball of AISI 52100 steel and an abrasive slurry, prepared with SiC and distilled water; different values of normal force and sliding distance were defined for the wear experiments to investigate and validate the constructed machine. The results showed that due to test conditions, it was observed the occurrence of rolling abrasion. The equipment showed excellent functionality and reproducibility, in terms of formation of the wear craters and measurement of the coefficient of friction.

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“…Geralmente, são observados dois modos de desgaste abrasivo sobre a superfície da cratera desgastada: "rolamento" (Figura 3a), (6) que resulta quando as partículas abrasivas rolam sobre o corpo de prova, enquanto "riscamento" (Figura 3b) (7) é reportado quando as partículas abrasivas deslizam. Dependendo das condições de ensaio, "rolamento" e "riscamento" podem ocorrer simultaneamente em uma dada cratera de desgaste (Figura 3c).…”

Section: Equipamento De Ensaio De Desgasteunclassified

Análise Comportamental Dos Coeficientes De Atrito E Desgaste De Sistemas Revestidos Submetidos a Desgaste Micro-Abrasivo

Tschiptschin

Cozza

Recco

et al. 2010

TMM

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ResumoEste trabalho objetiva estudar a influência das durezas de filmes finos de nitreto de titânio (TiN) e carbeto de titânio (TiC) sobre os coeficientes de atrito e desgaste, em ensaios ball-cratering. Uma esfera de aço AISI 52100 e dois corpos de prova de aço-ferramenta AISI D2, um revestido com TiN e outro revestido com TiC, foram utilizados nos experimentos. A pasta abrasiva foi preparada com partículas de carbeto de silício (SiC) preto e água destilada. Duas forças normais e seis distâncias de deslizamento foram definidas, sendo as forças normal (N) e tangencial (T) monitoradas constantemente. Assim como N e T, com o auxílio de uma Régua Linear, o deslocamento (h) do corpo de prova, na direção paralela à aplicação da carga normal, foi continuamente medido, o que permite o cálculo do coeficiente de desgaste para as diferentes distâncias de deslizamento sem a necessidade de interrupção do ensaio. O coeficiente de atrito é determinado pela relação entre as forças tangencial e normal e, para ambos os revestimentos, os valores permaneceram, aproximadamente, na mesma faixa (entre µ = 0,4 e µ = 0,9). Por outro lado, o coeficiente de desgaste diminui com o aumento da dureza do revestimento. Palavras-chave: Ensaio de desgaste; Coeficiente de atrito; Coeficiente de desgaste. ANALYSIS OF THE FRICTION AND WEAR COEFFICIENTS OF COATED SYSTEMS SUBMITTED TO MICRO-SCALE ABRASION AbstractThis work aims to study the influence of titanium nitride (TiN) and titanium carbide (TiC) coatings hardness on the friction coefficient and wear coefficient in ball-cratering micro-abrasive wear tests. A ball of AISI 52100 steel and two specimens of AISI D2 tool steel, one coated with TiN and another coated with TiC, were used in the experiments. The abrasive slurry was prepared with black silicon carbide (SiC) particles and distilled water. Two normal forces and six sliding distances were defined, and both normal (N) and tangential (T) forces were monitored constantly. The movement of the specimen in the direction parallel to the applied force was also constantly monitored with the help of a Linear Ruler. This procedure allows the calculation of the wear coefficient for the different sliding distances without the need to stop the test. The friction coefficient is determined by the ratio between the tangential and the normal forces, and for both TiN and TiC coatings, the values remained, approximately, in the same range (from µ = 0.4 to µ = 0.9). On the other hand, the wear coefficient decreases with the increase in coating hardness.

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Friction coefficient and abrasive wear modes in ball-cratering tests conducted at constant normal force and constant pressure—Preliminary results

Cited by 63 publications

References 58 publications

Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

Composite Layers “MgAl Intermetalic Layer / PVD Coating” Obtained On The AZ91D Magnesium Alloy By Different Hybrid Surface Treatment Methods

Projeto, Construção E Validação De Um Equipamento De Ensaio De Desgaste Micro-Abrasivo Por Esfera Rotativa Livre Para a Medição Do Coeficiente De Atrito

Análise Comportamental Dos Coeficientes De Atrito E Desgaste De Sistemas Revestidos Submetidos a Desgaste Micro-Abrasivo

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