Syntheses of ZrC–SiC nanopowder via sol–gel method

Liang, Mengshi; Li, Fēi; Ma, Xiaomin; Kang, Zhuang; Huang, Xiao; Wang, Xingang; Zhang, Guojun

doi:10.1016/j.ceramint.2015.09.073

Cited by 23 publications

(10 citation statements)

References 32 publications

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“…Then this carboxylates alkoxide can react to Equation (2). 19 The reaction 2 is the transesterification of The third reaction is between the unreacted AcOH and the PrOH (product of 1 and 2 reactions), to form water and propyl acetate according to Equation (3).…”

Section: Resultsmentioning

confidence: 99%

“…The sol-gel synthesis of ZrB 2 , 15 SiC, [16][17] ZrB 2 -SiC, 18 ZrC-SiC 19 To the best of our knowledge, there is no literature about the in situ synthesis of TiB 2 -B 4 C composite powder using sol-gel assisted method. In this study, the Zhang et al 19 strategy has been employed for the synthesis of TiB 2 -B 4 C composite powder. Also, the effect of different boron sources (boric acid and trimethyl borate (TMB)), B 2 O 3 / TiO 2 , and C/ B 2 O 3 mole ratios on the final composition was investigated.…”

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confidence: 99%

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Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder

GahremanDerakhshan

Nikzad

Farvizi

et al. 2020

Int J Applied Ceramic Tech

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Composite powders containing titanium diboride and boron carbide have been prepared by sol-gel method at 1450°C using titanium isopropoxide (titanium precursor), boric acid (Boron precursor), sucrose (carbon source), and acetic acid (AcOH) as a solvent. The effect of boron source (trimethyl borate and boric acid) and B 2 O 3 / TiO 2 , C/B 2 O 3 mole ratios of starting materials on the final phases has been studied. The progress of reactions was determined using thermal analysis (TGA-DTA). The resultant powders were characterized by X-ray diffraction (XRD) analysis and field-emission scanning electron microscope (FESEM). XRD patterns confirmed the formation of TiB 2 , B 4 C, and TiC phases after heat treatment at 1450°C at mole ratio of B 2 O 3 /TiO 2 = 4.5, C/B 2 O 3 = 2.4. With increasing the content of boron oxide, the unwanted phases such as TiC and C were reduced. TiB 2 and B 4 C composite powders (~5 µm diameter) containing residual carbon (<4 wt%) were synthesized using the mole ratio of B 2 O 3 /TiO 2 = 10 and C/B 2 O 3 = 1.9 at low temperature of 1450°C.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder

GahremanDerakhshan

Nikzad

Farvizi

et al. 2020

Int J Applied Ceramic Tech

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“…Liang et al [32] used zirconia sol, tetraethylorthosilicate (TEOS) and sucrose as the independent zirconium-, silicon-and carbon-containing source. Hybrid sol can be prepared by introducing TEOS and sucrose into zirconia sol.…”

Section: Recent Applications In Sol-gel Synthesismentioning

confidence: 99%

Preparation of Ultra-High Temperature Ceramics–Based Materials by Sol-Gel Routes

Li¹,

Huang²,

Zhang³

2017

Recent Applications in Sol-Gel Synthesis

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Ultra-high temperature ceramics (UHTCs) are a class of inorganic materials that have melting point over 3000°C and are typically borides, carbides, and nitrides of early transition metals. UHTCs are considered as the promising candidate used in the extreme environment involved with the hypersonic aviation thermal protective system. Synthesis of UHTCbased materials can be divided into solid-based and solution-based protocols according to the state of the raw materials. A sol-gel technique is one of the solution-based protocols for the preparation of UHTC-based materials, which involves the hydrolysis, condensation of the metal organic and/or metal inorganic compounds, gelation, and the posthigh temperature treatment of the dried gels. The sol-gel technique enables the synthesis of UHTC-based materials at 1300-1600°C. UHTC-based materials with desired shapes, such as nanopowders, fibers, and porous monoliths, can also be prepared via sol-gel routes.Recent interest in UHTCs has been motivated by the search for materials that can withstand extreme environments, such as extreme temperature, chemically aggressive environments, and rapid heating/cooling, etc. [5,6]. Due to the combination of series of excellent physical and chemical properties, such as high hardness, good high temperature stability, and excellent solid-phase stability, UHTCs are considered as promising candidates for a variety of high-temperature structural applications, including engines, hypersonic vehicles, plasma arc electrode, cutting tools, furnace elements, and high temperature shielding. However, owing to the strong covalent bond and relatively low volume diffusion coefficient, UHTCs are difficult to get successfully sintered. Densification of these materials is typically performed by hot pressing and spark plasma sintering with or without sintering aids.UHTCs can be synthesized by a variety of routes, which can be divided into solid phase protocols and solution based protocols based on the state of the starting materials [7,8]. Among the solid-phase protocols, transition metal oxides, carbon black, boron oxide, and boron carbide are commonly used as the starting materials. After ball-milling and high temperature carbothermal reduction, the mixtures are converted into UHTC powders. Examples of the reactions used to synthesize borides and carbides are listed in Table 1 [7]. These reactions are written for ZrB 2 and ZrC, but analogous processes produce other borides and carbides. These solid phase protocols are very straightforward and simple and are used to produce UHTC powders commercially. However, due to the heterogeneity of the reactants, the reactions need to be performed at high temperatures for several hours to complete. Also, those synthesized UHTC powders are micron-sized particles. Figure 1. A comparison of the melting temperatures of the most refractory members of several classes of materials.

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“…Different methods are used to produce zirconia powders. The most common methods used for commercial production are plasma-chemical [10][11][12] and sol-gel [13][14][15][16] synthesis methods. There are a number of other methods to produce ultra-fine or nanopowders, but they are typically low productive.…”

Section: Introductionmentioning

confidence: 99%

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

Sheveleva¹,

Shevelev²,

Sokolovskiy³

et al. 2020

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Thermal and XRD analyses were used to study partially stabilized zirconia powders produced by sol-gel method in order to investigate gas evolution in annealing in air and densification behavior of these powders in compaction and subsequent sintering. It was found that the powders of the initial gel contain a large amount of gas adsorbates. The amount of adsorbates decreases as the annealing temperature grows. At annealing temperature of 700 ºC, adsorbates are completely removed from the powders and the latter obtain a crystalline structure with a predominant tetragonal phase. Gas adsorbates affect densification of powder compacts during sintering and facilitate the production of ceramics with a porosity of not more than 5 %. It is shown that the production of low porosity ceramics is complicated even though powders subjected to annealing may contain nano-sized impurities or be free of these. Low-melting additives are proposed to be used for ceramics production.

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Syntheses of ZrC–SiC nanopowder via sol–gel method

Cited by 23 publications

References 32 publications

Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder

Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder

Preparation of Ultra-High Temperature Ceramics–Based Materials by Sol-Gel Routes

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

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Syntheses of ZrC–SiC nanopowder via sol–gel method

Cited by 23 publications

References 32 publications

Sol‐gel assisted synthesis of TiB2‐B4C composite powder

Sol‐gel assisted synthesis of TiB2‐B4C composite powder

Preparation of Ultra-High Temperature Ceramics–Based Materials by Sol-Gel Routes

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

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Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder

Sol‐gel assisted synthesis of TiB₂‐B₄C composite powder