中国科技论文在线

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2005年08月30日

【期刊论文】Microstructure of hot-pressed B4C-TiB2 thermoelectric composites

蔡克峰， K. F. Cai a.b.*， C. W. Nan c， M. Schmuecker a， E. Mueller a

K. F. Cai et al./Journal of Alloys and Compounds 350(2003)313-318，-0001，（）：

-1年11月30日

B4C-TiB2 thermoelectric composites were prepared via hot-pressing. The phase composition, microstructure of the samples were characterized by means of XRD, SEM and TEM. The composition of different phases, including grain boundary phase, was analyzed by means of EDS. The effects of the microstructure on the thermoelectric properties of the composites are discussed.

Composite materials， Semiconductors， Powder metallurgy， SEM， TEM

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2005年08月30日

【期刊论文】The influence of W2B5 addition on microstructure and thermoelectric properties of B4C ceramic

蔡克峰， Ke-feng Cai*， Ce-Wen Nan

K.-f. Cai, C.-W. Nan/Ceramics International 26(2000)523-527，-0001，（）：

-1年11月30日

摘要

B4C and B4C-W2B5 composite ceramics are prepared via hot pressing. The composition and microstructure of the ceramics are characterized by means of X-ray diffraction (XRD), electron probe microanalysis (EPMA) and transmission electron microscope (TEM). Their electrical conductivity and Seebeck coe

B.， Microstructure， D.， Boron carbide， Composite ceramic， Thermoelectric properties， Tungsten boride

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2005年08月30日

【期刊论文】Preparation of Al2O3-AlON and Al2O3-AlN composites via reaction-bonding

蔡克峰， K. F. CAI*， D. S. MCLACHLAN

，-0001，（）：

-1年11月30日

摘要

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2005年08月30日

【期刊论文】Preparation, microstructures and properties of Al2O3-TiC composites

蔡克峰， K. F. Cai a， *， D. S. McLachlan a， N. Axenb， R. Manyatsa b

K.-F. Cai et al./Ceramics International 28(2002)217-222，-0001，（）：

-1年11月30日

摘要

Al2O3-TiC composites with various amounts of TiC, from 16 to 30 vol.%, were pressureless-sintered using 1 wt.% Al as an additive. The electrical conductivity, Vickers hardness, fracture toughness and wear resistance of the composites were studied. The hardness and toughness increased gradually with the increase of TiC volume fraction. The electrical conductivity increased with the increase of TiC volume fraction and increased about 10 orders of magnitude as the TiC volume fraction changed from 0.20 to 0.23. A sample whose TiC volume fraction is 0.23, which is close to its percolation threshold, had the best wear resistance.

B.， Composites， B.， Microstructure， D.， Alumina， Properties， Titanium carbide

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2005年08月30日

【期刊论文】The effects of annealing on thermal and electrical properties of reaction-bonded AlN ceramic

蔡克峰， K. F. Cai a， b， c， *， D. S. McLachlan c， G. Sautic， E. Mueller b

K. F. Cai et al./Solid State Sciences 7(2005)945-949，-0001，（）：

-1年11月30日

摘要

An AlN ceramic sample was prepared using a reaction-bonding technique with Al and AlN powders, together with a very small amount of CaO (a sintering aid), as the starting materials. The effects of annealing at 1800℃ for 10 h in one atmosphere of Ar on the thermal and electrical properties of the ceramic were investigated. After annealing the thermal conductivity of the ceramic increased from 55 to 122W/mK, while the AC electrical conductivity, measured as a function of frequency, decreased. The difference in AC electrical conductivity before and after annealing gradually increased as the frequency decreased, reaching about one order of magnitude at 0.01Hz. The composition and microstructure were examined by means of XRD and SEM/EDS. The causes for the improvement in thermal and electrical properties due to the annealing are discussed.

Annealing， Nitrides， Microstructure， Thermal conductivity， Electrical properties

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