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Zulfia, Anne; Hand, Russell J.

doi:10.1023/a:1014395730170

Cited by 42 publications

(10 citation statements)

References 17 publications

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“…Ada dua syarat yang harus dilakukan pada proses pembuatan komposit ini, yaitu harus terdapat kandungan magnesium di dalam aluminium dan kondisi atmosfer nitrogen dalam dapur. Semakin banyak gas nitrogen yang mengalir akan semakin membantu kinerja magnesium untuk membasahi dan akhirnya memudahkan aluminium untuk terinfiltrasi [6][7][8].…”

Section: Pendahuluanunclassified

PENGARUH SUHU PEMANASAN DAN WAKTU TAHAN TERHADAP KARAKTERISASI MATERIAL KOMPOSIT LOGAM AL/SiC HASIL INFILTRASI TANPA TEKANAN

Zulfia¹,

Ariati²

2010

MST

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AbstrakPembuatan komposit matriks logam Al-SiC dapat dilakukan dengan metode infiltrasi tanpa tekanan (PRIMEX). Penelitian ini dilakukan dengan menggunakan ingot alumunium AC2B sebagai matrik dan 50%Vf serbuk SiC sebagai penguat yang dicampur dengan 10%wt Mg sebagai wetting agent. Waktu tahan dan suhu pemanasan pada penelitian ini divariasikan untuk melihat pengaruh waktu tahan dan suhu pemanasan terhadap sifat mekanik dari komposit Al-SiC. Waktu tahan yang digunakan adalah 2, 5, 8, 10, dan 12 jam sedangkan suhu pemanasan yang digunakan 750, 800, 900, 1000, dan 1100°C. Komposit yang diperoleh dianalisa baik sifat mekanis seperti densitas, porosital, kekerasan, laju aus dan metalography. Lamanya waktu tahan dan meningkatnya suhu pemanasan menghasilkan sifat mekanis yang lebih baik dari komposit logam Al/SiC tersebut, dan ditemukan bahwa kondisi optimum untuk mendapatkan sifat mekanis yang baik adalah pada kondisi waktu tahan 10 jam dan suhu pemanasan 1000°C. Abstract Effect of Firing Temperature and Holding Time on Characterization of Al/SiC Metal Matrix CompositesProduced by Pressureless Infiltration. The production of Al-SiC metal matrix composite can be carried out by pressureless metal infiltration processs (PRIMEX). The experiment was conducted using aluminium AC2B ingot as a matrix and 50%Vf SiC powder as a reinforcement which is mixed with 10% Mg powder for wetting agent. The variables of this experiment are holding time and firing temperature to investigate the effect of these conditions on mechanical properties of Al-SiC metal matrix composites. Holding time was conducted for 2,5,8,10,12 hours and firing temperatures was 750, 800, 900, 1000, 1100°C respectively.. The composites produced are analysed both mechanical properties and metalography such as densities, porosities, hardness, as well as wear rate. The results showed that the longer holding time and increasing firing temperature will increase mechanical properties of Al-SiC metal matrix composites, and it is found that the optimum mechanical properties at 1000°C for 10 hour.

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Section: Pendahuluanunclassified

PENGARUH SUHU PEMANASAN DAN WAKTU TAHAN TERHADAP KARAKTERISASI MATERIAL KOMPOSIT LOGAM AL/SiC HASIL INFILTRASI TANPA TEKANAN

Zulfia¹,

Ariati²

2010

MST

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“…Pressure-less infiltration techniques require the molten metals to have low surface tension to promote the wetting onto the ceramic preforms to reduce the energy required for infiltration. [27,30] The amount of penetration also depends upon the time allowed for molten metal to infiltrate. [30][31][32][33] Pressure-assisted infiltration, in contrast, requires an external force that propels the molten metal into the voids of ceramic preforms.…”

Section: Introductionmentioning

confidence: 99%

“…[27,30] The amount of penetration also depends upon the time allowed for molten metal to infiltrate. [30][31][32][33] Pressure-assisted infiltration, in contrast, requires an external force that propels the molten metal into the voids of ceramic preforms. Centrifugal and squeeze casting are the two typical pressure-assisted casting techniques.…”

Section: Introductionmentioning

confidence: 99%

Bio‐Inspired Ceramic–Metal Composites Using Ceramic 3D Printing and Centrifugal Infiltration

et al. 2021

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To address the strength–toughness dilemma, various techniques for the preparation of ceramic–metal composites have been proposed. Utilizing stereolithographic additive manufacturing and centrifugal infiltration, a method for the preparation of bio‐inspired ceramic–metal composites is proposed. The proposed method offers flexibility in the design of individual phases of ceramic–metal composites architecturally, with the benefits of scalability and individual phase dimensional control. The versatility of this approach is demonstrated by fabricating silica–aluminum composites with structures inspired by mineralized layers in bivalve mollusk shells, including both 2D prismatic and 3D interpenetrating composites. For composites in compression, the measured specific strength is as high as 169% than that of the base metal (monolithic 6061 aluminum alloy). The highest crack growth toughness of 12.89 MPa m1/2 is recorded. The crack growth sequence shows crack deflection at ceramic–metal interfaces. Based on the tomographic structural analysis of the ceramic parts, the porosity of the green and sintered parts are 9% and 15%, respectively. It is believed that the strength and fracture toughness of these ceramic–metal composites could be further improved if the mechanical properties of the ceramic components can be improved by reducing porosity and structural defects during printing and sintering steps.

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“…Whereas, previously, the limited wettability between the reinforcement and the Al matrix had to be overcome by the use of high-energy mechanical stirring (e.g., stir casting) [4][5][6][7][8][9][10], high-pressure infiltration of molten Al into a preform [11][12][13][14][15][16], or high-pressure consolidation of the powder mixture (powder metallurgy) [16][17][18][19][20][21], a key feature of the NISFAC process is its flexibility with respect to the selection of reinforcement regardless of the level of wettability [1][2][3]. Although the nitridation of aluminum has been investigated by a variety of in-situ techniques such as directed metal oxidation [22], pressureless metal infiltration [23], and reactive gas injection [24], etc., there have been limited studies on the nitridation-induced forming of aluminum matrix composites. In particular, we have examined the chemical and structural characteristics of the unique surface morphology of the AMCs produced from the initial powder state in the presence of nitrogen gas and have proposed an explanation for why the AMCs were produced only under a nitrogen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 2: Effect of Nitrogen Flow Rates and Processing Temperatures

et al. 2020

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The nitridation-induced self-formed aluminum matrix composite (NISFAC) process is based on the nitridation reaction, which can be significantly influenced by the characteristics of the starting materials (e.g., the chemical composition of the aluminum powder and the type, size, and volume fraction of the ceramic reinforcement) and the processing variables (e.g., process temperature and time, and flow rate of nitrogen gas). Since these variables do not independently affect the nitridation behavior, a systematic study is necessary to examine the combined effect of these variables upon nitridation. In this second part of our two-part report, we examine the effect of nitrogen flow rates and processing temperatures upon the degree of nitridation which, in turn, determines the amount of exothermic reaction and the amount of molten Al in the nitridation-induced self-formed aluminum matrix composite (NISFAC) process. When either the nitrogen flow rate or the set temperature was too low, high-quality composites were not obtained because the level of nitridation was insufficient to fill the powder voids with molten Al. Hence, since the filling of the voids in the powder bed by molten Al is essential to the NISFAC process, the conditions should be optimized by manipulating the nitrogen flow rate and processing temperature.

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Cited by 42 publications

References 17 publications

PENGARUH SUHU PEMANASAN DAN WAKTU TAHAN TERHADAP KARAKTERISASI MATERIAL KOMPOSIT LOGAM AL/SiC HASIL INFILTRASI TANPA TEKANAN

PENGARUH SUHU PEMANASAN DAN WAKTU TAHAN TERHADAP KARAKTERISASI MATERIAL KOMPOSIT LOGAM AL/SiC HASIL INFILTRASI TANPA TEKANAN

Bio‐Inspired Ceramic–Metal Composites Using Ceramic 3D Printing and Centrifugal Infiltration

Effect of Material and Process Variables on Characteristics of Nitridation-Induced Self-Formed Aluminum Matrix Composites—Part 2: Effect of Nitrogen Flow Rates and Processing Temperatures

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