Temperature dependence of hardness in silicon–carbide ceramics with different porosity

Milman, Yu.V.; Chugunova, S. І.; Goncharova, І. V.; Chudoba, Tadeusz; Łojkowski, Witold; Gooch, William A.

doi:10.1016/s0263-4368(99)00022-0

Cited by 74 publications

(42 citation statements)

References 13 publications

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“…10 where the hardness values were normalised to the initial room temperature value. There is no similar nanoindentation study available, so a comparison was made to a microindentation study (maximum load of 50 N) of dense, hot-pressed SiC by Milman et al [3]. That former study determined a constant hardness up to 200°C, but for temperatures above that the slope showed a similar decrease to the data obtained here.…”

Section: Variation In Grain Sizesupporting

confidence: 49%

“…Furthermore, the observed drop in hardness was notably steeper in the bulk CVD SiC, which consisted of grains that were an order of magnitude larger than those in the different TRISO coatings. This Figure 10 Hardness evolution with temperature, data normalised to room temperature hardness; literature data of fully dense, hotpressed SiC taken from Milman et al [3].…”

Section: Variation In Grain Sizementioning

confidence: 99%

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Comparison study of silicon carbide coatings produced at different deposition conditions with use of high temperature nanoindentation

et al. 2016

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The elastic modulus and hardness of different silicon carbide (SiC) coatings in tristructural-isotropic (TRISO) fuel particles were measured by in situ high temperature nanoindentation up to 500°C. Three samples fabricated by different research institutions were compared. Due to varied fabrication parameters the samples exhibited different grain sizes and one contained some visible porosity. However, irrespective of the microstructural features in each case the hardness was found to be very similar in the three coatings around 35 GPa at room temperature. Compared with the significantly coarser grained bulk CVD SiC, the drop in hardness with temperature was less pronounced for TRISO particles, suggesting that the presence of grain boundaries impeded plastic deformation. The elastic modulus differed for the three TRISO coatings with room temperature values ranging from 340 to 400 GPa. With increasing measurement temperature the elastic modulus showed a continuous decrease.

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Section: Variation In Grain Sizesupporting

confidence: 49%

Section: Variation In Grain Sizementioning

confidence: 99%

Comparison study of silicon carbide coatings produced at different deposition conditions with use of high temperature nanoindentation

et al. 2016

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“…Larger erodents produce deeper radial cracks. for material loss to occur from radial cracking should increase with erodent diameter (Lee etal., 2005;Milman et al, 1999). With the increasing of the CBPD particles in the composites from 10wt% to 20wt%, the wear rate of the composites increased gradually, reached a maximum and then declined gradually.…”

Section: Surface Morphology Of Taguchi Experimental Resultsmentioning

confidence: 98%

Damage Assessment of Short Glass Fiber Reinforced Polyester Composites: A Comparative Study

Patnaik¹,

Biswas²,

Kaundal³

et al. 2011

Nanocomposites With Unique Properties and Applications in Medicine and Industry

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“…Milman et al examined the influence of the porosity on the hardness of SiC. 24) Increasing porosity decreased the hardness, and the Vickers hardness of SiC with porosity of 20% was reported to be 7.4 GPa at 293 K. 24) In the present study, SiC porous granules with enough strength to maintain the firm shape could be obtained by heating at 973 K. In a liquid silicon infiltration processing, samples were heated in a silicon melt at 1823 K (melting point of Si: 1683 K) and then heated up to 1973 K to eliminate of remnant silicon. 4,7,8) Other reported methods for the synthesis of the SiC ceramics also require temperatures above 1573 K for the pyrolysis of Si contained vapors 9) and precursors and for carbothermal reduction.…”

Section: Low-temperature Synthesis Of Sic Porous Granules With a Na Fluxmentioning

confidence: 99%

Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

et al. 2008

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SiC porous granules were synthesized from activated granular charcoal and Si powder at 973 K by using a Na flux. The SiC granules maintained the shape of the charcoal with a dimension of about 5 mm in diameter and 7-10 mm in length. X-ray diffraction showed the structure of the formed SiC to be cubic -type. Agglomerates of a few dozen nm of SiC grains and an electron diffraction ring pattern of -SiC were observed with a transmission electron microscope. A micropore size distribution of < 4 nm and mesopores in the range of 20-40 nm were shown by a nitrogen adsorption technique. The SiC granules had a specific surface area of 3:4 AE 1:0 m 2 /g and a pore volume of 0:006 AE 0:002 cm 3 /g. The fracture stress of the SiC porous granules was evaluated to be 47 MPa by a compressive test at room temperature. The Vickers hardness of the granule surface was 13:1 AE 1:0 GPa.

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Temperature dependence of hardness in silicon–carbide ceramics with different porosity

Cited by 74 publications

References 13 publications

Comparison study of silicon carbide coatings produced at different deposition conditions with use of high temperature nanoindentation

Comparison study of silicon carbide coatings produced at different deposition conditions with use of high temperature nanoindentation

Damage Assessment of Short Glass Fiber Reinforced Polyester Composites: A Comparative Study

Low-Temperature Synthesis and Mechanical Properties of SiC Porous Granules from Activated Charcoal with a Na Flux

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