Synthesis and two-step sintering behavior of sol–gel derived nanocrystalline corundum abrasives

Li, Zicheng; Li, Zhihong; Zhang, Aiju; Zhu, Yumei

doi:10.1016/j.jeurceramsoc.2008.09.004

Cited by 26 publications

(8 citation statements)

References 35 publications

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“…The samples sintered at the same sintering profiles with a room temperature cooling yielded grain sizes of 400 and 560 nm, respectively. The conventional sintering at 1300°C for 2 h resulted to a final grain size of 800 nm [43]. In addition, the two-step sintered corundum abrasive exhibited excellent hardness (22 GPa), fracture toughness (3 MPam…”

Section: Sintering Of Aluminium-based Ceramicsmentioning

confidence: 99%

Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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Sintering is a critical phase in the production of ceramic bodies. By controlling the density and microstructure formation, sintering now emerged as a processing technology of ceramic materials. Tailoring the structural, mechanical, electrical, magnetic and optical properties is widening the application of ceramics in various fields. Recently, many advanced sintering methods have reported to fabricate ceramic materials with controlled properties. Two-stage sintering (TSS) is one of the simple and cost-effective methods to obtain near-theoretical density materials with controlled grain growth without adding any dopants. Many recent works have reported the use of TSS as a processing method to fabricate nanoceramics for various applications. With this background, this chapter reviews the advantages of TSS in ceramic preparation based on properties and materials and explores the future directions.

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Section: Sintering Of Aluminium-based Ceramicsmentioning

confidence: 99%

Two-Step Sintering of Ceramics

Sutharsini¹,

Murugathas²,

RameshSingh³

2018

Sintering of Functional Materials

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“…The grain growth is considerably limited through sintering temperature control and the application of compounds supporting sintering such as MgO-CaO-SiO 2 , during the last of the twolevel sintering stages. Material of high-density (over 99 % of the theoretic density), characterized by grain sizes approximately 10 times smaller than is the case during traditional sintering processes, is obtained as a result of such processes [54]. The microstructure of nanocrystalline sintered corundum grains obtained with this method is uniform and devoid of excessively developed crystals, as presented in Fig.…”

Section: Nanocrystalline Sintered Corundummentioning

confidence: 87%

“…17 Microscopic view of the nanocrystalline sintered corundum microstructure: a magnification×40,000 [53]; b magnification×125,000 [54] obtained in chemical precipitation or sintering processes, will dominate the market for conventional abrasive grains. This is also connected with a drop in the prices of these abrasives, which is as a result of their increased production in developing countries, such as China or Brazil [11].…”

Section: Discussionmentioning

confidence: 99%

“…It was only in 2008 when the first reports appeared about abrasive grains from nanocrystalline sintered corundum whose average grain size was below 100 nm [52][53][54] (60 nm [55]), which is produced with the sol-gel technology using the two-level sintering method in 1,150-1,300°C [52][53][54]. The grain growth is considerably limited through sintering temperature control and the application of compounds supporting sintering such as MgO-CaO-SiO 2 , during the last of the twolevel sintering stages.…”

Section: Nanocrystalline Sintered Corundummentioning

confidence: 99%

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State of the art in production, properties and applications of the microcrystalline sintered corundum abrasive grains

Nadolny

2014

Int J Adv Manuf Technol

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The following article presents the current state of knowledge about technologies connected with microcrystalline sintered corundum against the backdrop of present abrasive products and the contemporary grains market. The complementary presentation of issues related to the microcrystalline sintered corundum abrasive grains, which constitute an important group of abrasives used in modern grinding technology, was given. The most important stages in the development of sintered corundum grains production technology, from the 1960s to current developments (nanocrystalline sintered corundum) in this field, were presented in chronological order. The production technology, properties, working conditions, wear phenomena and most important areas of application of such abrasive grains were described. Particular attention was paid to the wear phenomena of microcrystalline sintered corundum abrasive grains occurring during the grinding process. The collection of phenomena affecting the extension of the life of these types of grain in comparison with the white fused alumina grains were described. Moreover, forecasts concerning the development of abrasive grains of micro-and nanocrystalline sintered corundum were presented.

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“…If the syntheses of aluminium oxide are the sol-gel method using carboxylic acids [28,29] or ammonia [30,31], the resulting precursor is usually converted into corundum annealing at 800-1300 1C. In the reactions of aluminium nitrate with glycine, as a rule, there is a formation of an amorphous product, which upon annealing up to 600-800 1C transforms into g-Al 2 O 3 [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis of α-Al2O3 using urea

Журавлев

Бамбуров

Бекетов

et al. 2013

Ceramics International

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The processes involved in the solution combustion synthesis of a-Al 2 O 3 using urea as an organic fuel were investigated. The data describing the influence of the relative urea content on the characteristic features of the combustion process, the crystalline structure and the morphology of the aluminium oxide are presented herein. Our data demonstrate that the combustion of stable aluminium nitrate and urea complexes leads to the formation of a-alumina at temperatures of approximately 600-800 1C. Our results, obtained using differential thermal analysis and IR spectroscopy methods, reveal that the low-temperature formation of a-alumina is associated with the thermal decomposition of an a-AlO(OH) intermediate, which was crystallised in the crystal structure of the diaspore.

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Synthesis and two-step sintering behavior of sol–gel derived nanocrystalline corundum abrasives

Cited by 26 publications

References 35 publications

Two-Step Sintering of Ceramics

Two-Step Sintering of Ceramics

State of the art in production, properties and applications of the microcrystalline sintered corundum abrasive grains

Solution combustion synthesis of α-Al2O3 using urea

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