Nitridation-assisted Al infiltration for fabricating Al composites

Lee, Kon-Bae; Yoo, Seong-Hyeon; Kim, Hae-Sung; Won, Sung Ok; Yang, Bum-Jin; Ahn, Jae‐Pyoung; Choi, Hyunjoo

doi:10.1007/s10853-016-0571-7

Cited by 6 publications

(8 citation statements)

References 35 publications

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“…As found in both the previous [16] and present study, the nitriding reaction begins even at temperatures below the melting point of Al (or the liquidus temperature of aluminum alloys), and the degree of nitridation increases with time ( Figure 1 and Table 1), resulting in the transformation In previous work, we reported that the degree of nitridation and resultant powder-bed temperature change varied significantly according to the volume fraction of the reinforcement [16,[18][19][20][21]. Before heating, the aluminum powder in the powder bed was covered with an amorphous Al 2 O 3 layer as shown in Figure 1a.…”

Section: Temperature Change Of Powder Bed By Nitridationsupporting

confidence: 84%

“…The evolution of microstructure during heating was also investigated by SEM analysis. As previously reported [16][17][18][19][20][21], the amount of reaction product on the surface of the Al powder and SiC particles increased with increasing heating time, and EDS analysis identified the reaction product as aluminum nitride (AlN) [16]. During the NISFAC process, the heat dissipated by the exothermic nitridation reaction can lead to the melting of the Al powder, and the molten Al can fill the voids in the powder bed to form a dense composite.…”

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 61%

“…As found in both the previous [16] and present study, the nitriding reaction begins even at temperatures below the melting point of Al (or the liquidus temperature of aluminum alloys), and the degree of nitridation increases with time ( Figure 1 and Table 1), resulting in the transformation of the surface Al 2 O 3 layers into AlON/AlN layers (Figure 1b). This surface modification of aluminum powder has been previously observed by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) analysis, thus demonstrating that both the surface modification and the temperature rise due to the exothermic reaction could contribute to an enhanced wettability between the aluminum matrix and the reinforcement [16][17][18][19][20][21][28][29][30][31].…”

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 73%

“…(Figure 1b). This surface modification of aluminum powder has been previously observed by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) analysis, thus demonstrating that both the surface modification and the temperature rise due to the exothermic reaction could contribute to an enhanced wettability between the aluminum matrix and the reinforcement [16][17][18][19][20][21][28][29][30][31]. SEM images of samples produced under the conditions of Figure 2 are presented in Figures 3 and 4 along with photographic images of the samples after lathe working.…”

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 75%

“…As a result, the degree of nitridation also decreased from 49.8% to 31.3% (Table 1). In previous work, we reported that the degree of nitridation and resultant powder-bed temperature change varied significantly according to the volume fraction of the reinforcement [16,[18][19][20][21]. Before heating, the aluminum powder in the powder bed was covered with an amorphous Al2O3 layer as shown in Figure 1a.…”

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 1: Effect of Reinforcement Volume Fraction, Size, and Processing Temperatures

et al. 2020

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This paper investigates the effect of the size and volume fraction of SiC, along with that of the processing temperature, upon the nitridation behavior of aluminum powder during the nitridation-induced self-formed aluminum composite (NISFAC) process. In this new composite manufacturing process, aluminum powder and ceramic reinforcement mixtures are heated in nitrogen gas, thus allowing the exothermic nitridation reaction to partially melt the aluminum powder in order to assist the composite densification and improve the wetting between the aluminum and the ceramic. The formation of a sufficient amount of molten aluminum is key to producing sound, pore-free aluminum matrix composites (AMCs); hence, the degree of nitridation is a key factor. It was demonstrated that the degree of nitridation increases with decreasing SiC particle size and increasing SiC volume fraction, thus suggesting that the SiC surface may act as an effective pathway for nitrogen gas diffusion. Furthermore, it was found that effective nitridation occurs only at an optimal processing temperature. When the degree of nitridation is insufficient, molten Al is unable to fill the voids in the powder bed, leading to the formation of low-quality composites with high porosities. However, excessive nitridation is found to rapidly consume the nitrogen gas, leading to a rapid drop in the pressure in the crucible and exposing the remaining aluminum powder in the upper part of the powder bed. The nitridation behavior is not affected by these variables acting independently; therefore, a systematic study is needed in order to examine the concerted effect of these variables so as to determine the optimal conditions to produce AMCs with desirable properties for target applications.

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Section: Temperature Change Of Powder Bed By Nitridationsupporting

confidence: 84%

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 61%

“…As found in both the previous [16] and present study, the nitriding reaction begins even at temperatures below the melting point of Al (or the liquidus temperature of aluminum alloys), and the degree of nitridation increases with time ( Figure 1 and Table 1), resulting in the transformation of the surface Al 2 O 3 layers into AlON/AlN layers (Figure 1b). This surface modification of aluminum powder has been previously observed by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) analysis, thus demonstrating that both the surface modification and the temperature rise due to the exothermic reaction could contribute to an enhanced wettability between the aluminum matrix and the reinforcement [16][17][18][19][20][21][28][29][30][31].…”

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 73%

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 75%

Section: Temperature Change Of Powder Bed By Nitridationmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 1: Effect of Reinforcement Volume Fraction, Size, and Processing Temperatures

et al. 2020

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Ultrasound-assisted synthesis of ruthenium-decorated titanium boride nanocomposite structures for high-performance supercapacitors

Palem,

Devendrachari,

Singh

et al. 2024

Journal of Energy Storage

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Aluminum Matrix Composites Manufactured using Nitridation-Induced Self-Forming Process

Lee

Kim

et al. 2019

Sci Rep

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Conventional manufacturing processes for aluminum matrix composites (AMCs) involve complex procedures that require unique equipment and skills at each stage. This increases the process costs and limits the scope of potential applications. In this study, a simple and facile route for AMC manufacturing is developed, a mixture of Al powder and the ceramic reinforcement is simply heated under nitrogen atmosphere to produce the composite. During heating under nitrogen atmosphere, the surface modification of both Al and the reinforcement is induced by nitridation. When the oxide layer covering Al powder surface is transformed to nitrides, temperature in the local region increases rapidly, resulting in a partial melt of Al powder. The molten Al infiltrates into the empty space among Al powder and reinforcement, thereby enabling consolidation of powders without external forces. It is possible to fabricate AMCs with various types, sizes, volume fractions, and morphologies of the reinforcement. Furthermore, the manufacturing temperature can be lowered below the melting point of Al (or the solidus temperature for alloys) because of the exothermic nature of the nitridation, which prevents formation of un-wanted reactants. The relative simplicity of this process will not only provide sufficient price competitiveness for the final products but also contribute to the expansion of the application scope of AMCs.

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Nitridation-assisted Al infiltration for fabricating Al composites

Cited by 6 publications

References 35 publications

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 1: Effect of Reinforcement Volume Fraction, Size, and Processing Temperatures

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 1: Effect of Reinforcement Volume Fraction, Size, and Processing Temperatures

Ultrasound-assisted synthesis of ruthenium-decorated titanium boride nanocomposite structures for high-performance supercapacitors

Aluminum Matrix Composites Manufactured using Nitridation-Induced Self-Forming Process

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