Fabrication of NiAl–Al2O3-WC nanocomposite by mechanical alloying and subsequent heat treatment

Goudarzi, Azadeh; Lalianpour, A.; Mehrizi, M. Zarezadeh; Beygi, R.; B, G. Eisaabadi

doi:10.1016/j.ceramint.2019.06.147

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…A análise de DRX, na Figura 2 (b), foi realizada para o pó inicial de WC, gerando um difratograma, notou-se picos bem definidos e de alta intensidade, e sem a presença de impurezas, referente a ficha cristalográfica JCPDS número 150-1516. São condizentes com os padrões DRX em pó do WC pelo descrito na literatura [24,25]. A empresa CERVIN, produtora do pó de WC, forneceu um tamanho médio de partícula de 2,95 μm.…”

Section: Resultados E Discusãounclassified

Estudo do efeito do teor alumina no pó compósito WC-Ni-Al2O3 processado via Moagem de Alta Energia (MAE)

Valcacer¹,

Silva²,

Medeiros³

et al. 2021

Matéria (Rio J.)

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RESUMO A MP é constituída de, pelo menos, três etapas: obtenção do pó, conformação e sinterização. Na etapa de obtenção dos pós uma técnica de amplo uso é a Moagem de Alta Energia (MAE) que além de propiciar a quebra das partículas preexistentes, também pode melhorar a dispersão dos componentes. Um material obtido pela técnica é WC-Co, o metal duro, que apesar de ter propriedades interessantes, como por exemplo, alta dureza e resistência à compressão, não consegue manter tais características quando colocado em trabalho em altas temperaturas, como o corte na usinagem. Como alternativa ao sistema compósito WC-Co, estuda-se a substituição do cobalto pelo níquel, entretanto, o compósito WC-Ni apresenta uma baixa dureza quando comparado ao WC-Co. Para minimizar tal efeito, o presente estudo investigou a possibilidade da adição do óxido de alumínio (Al2O3) aos pós de WC e Ni. O estudo estabeleceu a influência da moagem de alta energia (MAE) nas características dos pós compósitos de WC-Ni-Al2O3 com 5 e 10%p de Al2O3. Fez-se moagem de alta energia (400 rpm) em via úmida pelos tempos de 1, 2, 4, 10 e 20h. As amostras foram caracterizadas por: DRX, particulometria a laser e MEV/EDS. Os resultados mostraram-se promissores uma vez que houve redução de até 50% do tamanho mediano de partícula com os tempos estudados, bem como, formação de partículas compósitas.

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Section: Resultados E Discusãounclassified

Estudo do efeito do teor alumina no pó compósito WC-Ni-Al2O3 processado via Moagem de Alta Energia (MAE)

Valcacer¹,

Silva²,

Medeiros³

et al. 2021

Matéria (Rio J.)

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“…Also, NiAl has good tribological properties [6,7]; however, sole NiAl materials contain low toughness and poor ductility at ambient temperature and poor strength and creep resistance at high temperatures which restricts its hightemperature applications [8,9]. Based on previous studies, the reduction of crystallite and particle sizes of NiAl [4,[10][11][12] and fabrication of In-situ composite [13,14] can improve the mechanical properties of NiAl. Many efforts have been devoted to developing a nano-crystalline reinforced nickel aluminide which one of them is reinforcing NiAl by a reinforcement(s) (as second phases) like ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Many efforts have been devoted to developing a nano-crystalline reinforced nickel aluminide which one of them is reinforcing NiAl by a reinforcement(s) (as second phases) like ceramic materials. For instance, NiAl-WC [8], NiAl-WC-Al 2 O 3 [13], NiAl-TiC [9,14,15], NiAl-TiB 2 [16], NiAl-ZrC [17], NiAl-Al 2 O 3 [18], NiAl-TiN/TiB 2 [19] composites have been studied. Because of low density, high hardness, high modulus of elasticity and high-temperature stability, titanium carbide (TiC) is a promising candidate as reinforcement [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Mehrizi¹

2020

Preprint

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The aim of this study was the synthesis of a homogenous distributed NiAl/TiC composite by combustion synthesis of elemental powders. The effect of the mechanical activation process was evaluated. The phase characterization and evaluation of the microstructure during milling and combustion synthesis were carried on by XRD and SEM-EDS and TEM-EDS, respectively. The XRD result of as-mixed powder compact after combustion synthesis showed that in addition to TiC0.75 and NiAl, some undesired phases like Ni3Al and Ni2Al3 formed. While after combustion synthesis of 3h mechanically activated powder compact, only AlNi and TiC formed. The microstructural evaluations by SEM-EDS and TEM-EDS analysis confirmed the synthesis of truly homogenized NiAl/TiC composite. The mechanism of NiAl/TiC formation consists of dissolution of nickel, titanium, and graphite in molten aluminum and precipitation of TiC primarily and then the formation of NiAl. The value of microhardness of synthesized NiAl/TiC was 1070±12 HV. The main reason for this result is a uniform distribution of spherical TiC reinforcement in the NiAl matrix. Therefore, the mechanical activation process facilitated the reactions and improved the mechanical properties of the final composite.

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Challenges of nanoparticle-reinforced NiAl-based coatings processed by in situ synthesis of the aluminide

Abreu-Castillo,

d’Oliveira

2024

Int J Adv Manuf Technol

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Fabrication of NiAl–Al2O3-WC nanocomposite by mechanical alloying and subsequent heat treatment

Cited by 12 publications

References 30 publications

Estudo do efeito do teor alumina no pó compósito WC-Ni-Al2O3 processado via Moagem de Alta Energia (MAE)

Estudo do efeito do teor alumina no pó compósito WC-Ni-Al2O3 processado via Moagem de Alta Energia (MAE)

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Challenges of nanoparticle-reinforced NiAl-based coatings processed by in situ synthesis of the aluminide

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