Effect of particle size on densification of pure magnesium during spark plasma sintering

Cheng, Yinlong; Cui, Zeqin; Cheng, Linxin; Gong, Dianqing; Wang, Wenxian

doi:10.1016/j.apt.2017.01.017

Cited by 56 publications

(19 citation statements)

References 22 publications

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“…As a result, the densification process of the CaZrO 3 ceramic core materials will be promoted by reasonable particle size matching. It is well known that the particle size directly influences the specific surface energy of particles, further affecting the driving force in the sintering of particles 14,15 . Owing to the higher special surface energy of particles with small size than that of particles with big size, the sintering of the particles with small size can be easier.…”

Section: Resultsmentioning

confidence: 99%

Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores

Yang

et al. 2021

Int J Applied Ceramic Tech

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The CaZrO3 ceramic core materials with excellent mechanical and chemical properties were successfully prepared using single‐phase CaZrO3 powders. Effects of particle size ratio and sintering temperature on the mechanical and chemical properties of CaZrO3 ceramic core materials were researched. The chemical property was analyzed by leaching research of core materials in 10 wt% and 20 wt% HNO3 solution at the boiling point. Results showed that the suitable particle size ratio was important for the preparation of CaZrO3 ceramic core materials with excellent comprehensive properties. The addition of fine particles in ceramic core materials promoted the densification process owing to the framework formed by coarser particles and sintering neck formed by fine particles between coarse particles, which was beneficial for further improving their bending strength. When the content of particles with 200 mesh size was 80wt%, the highest bending strength was obtained, 54.38 ± 5.28 MPa. The porosity was 17.45% and the volume density was 3.86 g/cm3. The increasing sintering temperature increased the densification of CaZrO3 ceramic core materials by offering the sintering driving force, further leading to the improvement of bending strength. When the temperature was 1650℃, at the 20% content of particles with 200 mesh size, the highest bending strength of CaZrO3 cores reached 51.01 ± 5.18 MPa. Meanwhile, the porosity was 18.65% and the volume density was 3.83 g/cm3. Additionally, the CaZrO3 samples could be effectively leached in 10 wt% HNO3 solution. Therefore, CaZrO3 materials with good mechanical and leaching properties were believed to be a suitable candidate for ceramic core materials in the investment casting of alloys with high melting point.

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Section: Resultsmentioning

confidence: 99%

Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores

Yang

et al. 2021

Int J Applied Ceramic Tech

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“…Besides, the intermetallic phases (bright lines) in small powders also showed a narrower width than that in large powders. The molten alloy droplet cooling rate is in direct proportion to its specific surface area [ 20 , 21 ]. While, the small powder had 10 times bigger specific surface area as compared to the large one and, thus, a faster cooling rate resulted in refined structures (fine grains and intermetallic phases) in small powders.…”

Section: Resultsmentioning

confidence: 99%

Passive Film Properties of Bimodal Grain Size AA7075 Aluminium Alloy Prepared by Spark Plasma Sintering

Tian

Kang

et al. 2020

Materials

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The bimodal-grain-size 7075 aluminium alloys containing varied ratios of large and small 7075 aluminium powders were prepared by spark plasma sintering (SPS). The large powder was 100 ± 15 μm in diameter and the small one was 10 ± 5 μm in diameter. The 7075 aluminium alloys was completely densified under the 500 °C sintering temperature and 60 MPa pressure. The large powders constituted coarse grain zone, and the small powders constituted fine grain zone in sintered 7075 aluminium alloys. The microstructural and microchemical difference between the large and small powders was remained in coarse and fine grain zones in bulk alloys after SPS sintering, which allowed for us to investigate the effects of microstructure and microchemistry on passive properties of oxide film formed on sintered alloys. The average diameter of intermetallic phases was 201.3 nm in coarse grain zone, while its vale was 79.8 nm in fine grain zone. The alloying element content in intermetallic phases in coarse grain zone was 33% to 48% higher than that on fine grain zone. The alloying element depletion zone surrounding intermetallic phases in coarse grain zone showed a bigger width and a more severe element depletion. The coarse grain zone in alloys showed a bigger electrochemical heterogeneity as compared to fine grain zone. The passive film formed on coarse grain zone had a thicker thickness and a point defect density of 2.4 × 1024 m−3, and the film on fine grain zone had a thinner thickness and a point defect density of 4.0 × 1023 m−3. The film resistance was 3.25 × 105 Ωcm2 on coarse grain zone, while it was 6.46 × 105 Ωcm2 on fine grain zone. The passive potential range of sintered alloys increased from 457 mV to 678 mV, while the corrosion current density decreased from 8.59 × 10−7 A/cm2 to 6.78 × 10−7 A/cm2 as fine grain zone increasing from 0% to 100%, which implied that the corrosion resistance of alloys increased with the increasing content of fine grains. The passive film on coarse grain zone exhibited bigger corrosion cavities after pitting initiation compared to that on fine grain zone. The passive film formed on fine grain zone showed a better corrosion resistance. The protectiveness of passive film was mainly determined by defect density rather than the thickness in this work.

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“…[9] Recently, FAST/SPS has been successfully applied, e.g., for the development of all-solid-statebattery materials, [16,17] UHTCs, [18] transparent ceramics, [19,20] high entropy alloys, [21] as well as thermoelectric and magnetic materials. [22] Another important area of application is manufacturing of high-performing lightweight alloys based on Al, [23] Mg, [24,25] or titanium, [26] e.g., by controlled crystallization of amorphous starting powders in a FAST/SPS device. [27,28] This approach is especially attractive for high strength structural [28] and-in the case of titanium alloys-for biomedical applications.…”

Section: Application Of Fast/sps For Synthesis Of High-performing Matmentioning

confidence: 99%

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

et al. 2020

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Highly efficient energy conversion and storage technologies such as high‐temperature solid oxide fuel and electrolysis cells, all‐solid‐state batteries, gas separation membranes, and thermal barrier coatings for advanced turbine systems depend on advanced materials. In all cases, processing of ceramics and metals starting from powders plays a key role and is often a challenging task. Depending on their composition, such powder materials often require high sintering temperatures and show an inherent risk of abnormal grain growth, evaporation, chemical reaction, or decomposition, especially in the case of long dwelling times. Electric current‐assisted sintering (ECAS) techniques are promising to overcome these restrictions, but a lot of fundamental and practical challenges must be solved properly to take full advantage of these techniques. A broad and long‐term expertise in the field of ECAS techniques and comprehensive facilities including conventional field‐assisted sintering technology/spark plasma sintering (FAST/SPS), hybrid FAST/SPS (with additional heater), sinter forging, and flash sintering (FS) devices are available at the Institute of Energy and Climate Research: Materials Synthesis and Processing (IEK‐1). Herein, main advantages and challenges of these techniques are discussed and the concept to overcome current limitations is introduced on selected examples.

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Effect of particle size on densification of pure magnesium during spark plasma sintering

Cited by 56 publications

References 22 publications

Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores

Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores

Passive Film Properties of Bimodal Grain Size AA7075 Aluminium Alloy Prepared by Spark Plasma Sintering

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

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Effect of particle size on densification of pure magnesium during spark plasma sintering

Cited by 56 publications

References 22 publications

Preparation, mechanical, and leaching properties of CaZrO3 ceramic cores

Preparation, mechanical, and leaching properties of CaZrO3 ceramic cores

Passive Film Properties of Bimodal Grain Size AA7075 Aluminium Alloy Prepared by Spark Plasma Sintering

Application of Electric Current‐Assisted Sintering Techniques for the Processing of Advanced Materials

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Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores

Preparation, mechanical, and leaching properties of CaZrO₃ ceramic cores