Conventional and high frequency microwave processing of nanophase ceramic materials

Lewis, David; Rayne, Roy J.; Bender, Barry A.; Kurihara, Lynn K.; Chow, Gan‐Moog; Fliflet, A. W.; Kincaid, Anthony E.; Bruce, Ralph W.

doi:10.1016/s0965-9773(97)00027-5

Cited by 20 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CMW selective heating was promoted (either intentionally or not) by many authors [1,7,[14][15][16][17][18], by adding small amounts of some metallic oxides (e.g., MgO, Y 2 O 3 , ZrO 2 ) to pure ␣-alumina powder. Interestingly, a selective heating feature was also found when using amorphous ␥-alumina [17,19] rather than ␣-alumina, or when sintering nanoparticle ␣-alumina [8,20] rather than micrometer size powder. Moreover, Fang et al [19 and reference herein] noticed that diphasic mullite gel coupled very well with CMW owing to the presence of the amorphous silica in the gel.…”

Section: Basic Principles and Literature Survey Of Cmws And Mmws Of Amentioning

confidence: 96%

See 1 more Smart Citation

Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz

Maizza

Grasso

Sakka

2014

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

Pure ultrafine alumina powder (0.2 m average grain size (GS)) was sintered with a 28 GHz millimeterwave radiation source by systematically varying sintering temperature (ST), holding time (HT), and heating rate (HR). Densification, microstructure and grain growth effects were analyzed after millimeterwave sintering (MMWS). Alumina compacts were densified under rapid heating at 1100 • C without any HT up to 96% TD by retaining sub-micrometric GS (∼0.4 m) and homogeneous microstructure. The ST was increased to 1200 • C (without HT, 50 • C/min HR) to achieve densification up to 98.6% TD, however, at the expense of an increased GS of ∼2 m. Microstructure was maintained uniform throughout the sample even under extremely fast firing conditions of 200 • C/min HR except for the case in which HT was changed. Remarkable grain growth was observed when either ST or HT increased above the reference values.

show abstract

Section: Basic Principles and Literature Survey Of Cmws And Mmws Of Amentioning

confidence: 96%

“…To date a number of millimeter-wave sintering (MMWS) devices have been commercialized worldwide. Most of them operate in the band of 28-83 GHz [4][5][6][7][8][9], specifically 28, 30, 60 and 83 GHz [10].…”

Section: Introductionmentioning

confidence: 99%

Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz

Maizza

Grasso

Sakka

2014

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

show abstract

“…43 Consequently, numerous investigations aimed at understanding the sintering behavior of micron-sized powders of Al 2 O 3 , Al 2 O 3 -SiO 2 , Al 2 O 3 -TiO 2 , WC-Co, and Si 3 N 4 were attempted. [43][44][45][46] Boch and Lequeux 44 observed an enhancement in the sintering rate of alumina silica and alumina titania powders, which was possibly attributable to the additive driving force that predominates near surfaces and grain boundaries of the particles during microwave processing. A comparative study of sintering nanocrystalline TiO 2 powders was carried out by Bykov et al 47 Surprisingly, significant grain growth was observed while achieving highly densified compacts.…”

Section: Microwave Sinteringmentioning

confidence: 99%

Manufacturing Nanocomposite Parts: Present Status and Future Challenges

Seal¹,

Kuiry²,

Georgieva³

et al. 2004

MRS Bull.

View full text Add to dashboard Cite

The promises of nanotechnology are mostly based upon the ability to produce nanostructured materials with novel properties. Nanocomposites are defined here as a class of materials that contain at least one phase with constituents in the nanometer domain. This article describes the present state of knowledge of the fabrication of nanocomposite materials, with special emphasis on plasma forming of bulk parts. Future challenges facing the development of methods for consolidating nanocomposites with retained nanostructures are also highlighted.

show abstract

“…Such systems can have unique advantages or capabilities vs. conventional material processing. We have investigated the use of 2.45 GHz and 35 GHz cavity systems in rapid thermal processing of ceramics [1][2][3][4][5][6]. We are currently using two particular systems: an S-Band, 2.45 GHz system for continuous production of nanophase oxides and metals, and an 83 GHz, millimeter-wave beam system for sintering, joining, coating and coating removal [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Processing of Advanced Materials with a High Frequency, Millimeter-Wave Beam Source and other Microwave Systems

Imam

Lewis

Bruce

et al. 2003

MSF

Self Cite

View full text Add to dashboard Cite

Abstract. An 83 GHz gyrotron-based, millimeter-wave beam system is being used in material processing: in rapid sintering of oxides, ferrites, and metal-ceramic composites to retain very fine grain structure in the product for improved mechanical and electromagnetic properties; in joining of ceramic and ceramic composite materials (with unique advantages-localization of heating, permitting inexpensive fixturing and instrumentation and minimizing thermal damage to components; depositing energy specifically in a narrow joint region through a guided wave effect), and in coating densification and coating removal where the high frequency and short wavelength permit significant energy deposition in relatively thin coatings. In a related effort, we are using a low frequency microwave system for low cost continuous production of nanophase metals. This process should produce a range of nanophase metals, metal oxides and mixtures of these, in sizeable quantities and at low cost. The results of various experiments in these areas will be discussed, as will the potential of low and high frequency microwave processing of advanced materials.

show abstract

Conventional and high frequency microwave processing of nanophase ceramic materials

Cited by 20 publications

References 0 publications

Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz

Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz

Manufacturing Nanocomposite Parts: Present Status and Future Challenges

Processing of Advanced Materials with a High Frequency, Millimeter-Wave Beam Source and other Microwave Systems

Contact Info

Product

Resources

About