Improving the self-sintering of mesocarbon-microbeads for the manufacture of high performance graphite-parts

Fang, Ming-Dar; Tseng, Wenliang; Jow, Jiin-Jiang; Lee, Chien-Ming; Chen, Ho-Rei; Wu, Mao‐Sung; Ling, Tzong-Rong

doi:10.1016/j.carbon.2011.09.052

Cited by 22 publications

(10 citation statements)

References 15 publications

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“…3. The bending strength of the various carbon blocks increases linearly with an increasing b-resin content in the mixtures, as reported in our previous paper [15]. The highest bending strength (142 MPa) was obtained from CC CG samples having 14.4% b-resin content in the raw materials.…”

Section: Improvement Of Bending Strength and Density Of The Carbonizesupporting

confidence: 54%

“…contents. The green sample blocks were carbonized in a Carbolite CWF-1100 furnace using a carbonization time-temperature sequence given in our previous paper [15]. The weight of the samples, before and after the carbonization, was measured in milligrams to determine the weight loss during the procedure.…”

Section: Methodsmentioning

confidence: 99%

“…The reason for this is that the reactions are not fully homogenous [14e17]. However, the b-resin content of the MCMB raw materials must be limited, as an excess will promote bursting of the carbon matrixes, due to the release of volatiles during degradation [15,18,19]. The fluidity change of the raw materials can also affect neck-formation [2] between the MCMBs and consequently alter the product's resulting strength.…”

Section: Introductionmentioning

confidence: 99%

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Improving the sintering behavior of mesocarbon-microbeads for the manufacture of high quality carbon products using a joint promoter comprising carbon black and glycidyl methacrylate

Fang

Jow

Yeh

et al. 2015

Materials Chemistry and Physics

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Section: Improvement Of Bending Strength and Density Of The Carbonizesupporting

confidence: 54%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the sintering behavior of mesocarbon-microbeads for the manufacture of high quality carbon products using a joint promoter comprising carbon black and glycidyl methacrylate

Fang

Jow

Yeh

et al. 2015

Materials Chemistry and Physics

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“…Compaction behavior was elucidated by feeding ~0.5 g of the mix individually into the compaction die with 10 mm diameter ( Figure 2) and compacted using Universal Testing Machine (Instron, 4483) ( Figure 3) [8]. Load-displacement values were recorded using a computer interface.…”

Section: Compaction Of Formulations By Die Compaction Experiments Cmentioning

confidence: 99%

Evaluation of Physico-Chemical, Thermal and Mechanical Properties of Sintered Graphite and Mesophase Formulations

G¹,

Sp²

2016

J Material Sci Eng

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Carbon/graphite materials are widely applied to the areas of seal and friction materials. These applications exploit the exceptional properties of carbon/graphite, such as its excellent mechanical behavior at high temperature and low reactivity. However, Owing to high open porosity, and low strength conventional carbon/graphite materials prepared using pulverized coke as filler and pitch as binder fall across enormous challenge. Therefore, it is necessary to reduce the open porosity and increase in the strength along with thermal conductivity. Using natural graphite as filler instead of coke to prepare carbon blocks can avoid high-temperature graphitization and repeated dipping owing to the high degree of graphitization and high thermal stability of natural graphite; thus it can simplify the working process, save energy and reduce cost. Carbonaceous mesophase has inherent properties, such as a high softening point, high fluidity, high carbon yield, and graphitizability, which make it suitable for the fabrication of polygranular carbon materials. Furthermore, it can be used as a binder. The sintering was performed in a static furnace with argon atmosphere and compared with the same compound sintered in passage furnace with hydrogen and nitrogen atmosphere. The analysis of the properties of the tested material was performed with the aid of metallography using a scanning electron microscope, which verified the particle size distribution, chemical elements and pores present. However, for the graphite powder and zinc stearate, present in smaller percentages were disregarded its influence on the physical properties of the compound generated. Compressibility and compaction are parameters that indicate and describe the behavior of metal powders as they are compressed. The ability of a powder densification is related to compressibility. Already compaction is defined as the stability of the structure of the pressed compacted to a certain working pressure. Therefore, the natural graphite as filler and mesophase pitch as binder can be able to produce high density graphite blocks. The main aim of this work is to produce isotropic graphite material and evaluation of its properties such as high density, high thermal conductivity, high electrical resistivity, low coefficient of thermal expansion, and high compressive strength from natural graphite powder mesophase pitch.

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“…Mesocarbon microbeads (MCMBs) have been extensively explored as a precursor for such high density and high strength artefacts [11][12][13][14][15][16][17][18][19]. However, the production of MCMBs is also a multi-step process which involves the thermal treatment of a precursor to develop the microbeads followed by a tedious solvent extraction step that uses expensive and dangerous aromatic solvents such as pyridine.…”

Section: Introductionmentioning

confidence: 99%

Production of a self-adhering mesophase powder from anthracene oil for low pressure forming of graphite artefacts

Delport

Badenhorst

2016

J Mater Sci

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The objective of the investigation was to produce a high mesophase content pitch from low cost anthracene oil without the use of catalysts. The pitch product was then used to produce graphitic artefacts using only a low pressure (5 MPa) forming step followed by carbonization and graphitization at a comparatively high heating rate.The heat treatment times and temperatures were varied across a wide range but only material treated at 475 ºC produced a significant amount of mesophase.Furthermore only one pitch material resulted in a successful moulding which could be carbonized and graphitized. This pitch contained a significant portion (~ 8 wt%) of light material, which results in melting and flow behaviour during pressing, rather than sintering, if it is removed the material can no longer be successfully pressed.Due to the high mesophase content of the pitch a high density (1720 kg.m -3 ), highly graphitic artefact with minimal deformation during heat treatment is produced.The graphite product demonstrates grain separation but still results in a reasonable flexural strength of 4.5 MPa which may be improved further by re-impregnation depending on the requirement. This combined with its excellent purity and high yield make it a good candidate for nuclear applications.

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Improving the self-sintering of mesocarbon-microbeads for the manufacture of high performance graphite-parts

Cited by 22 publications

References 15 publications

Improving the sintering behavior of mesocarbon-microbeads for the manufacture of high quality carbon products using a joint promoter comprising carbon black and glycidyl methacrylate

Improving the sintering behavior of mesocarbon-microbeads for the manufacture of high quality carbon products using a joint promoter comprising carbon black and glycidyl methacrylate

Evaluation of Physico-Chemical, Thermal and Mechanical Properties of Sintered Graphite and Mesophase Formulations

Production of a self-adhering mesophase powder from anthracene oil for low pressure forming of graphite artefacts

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