中国科技论文在线

上传时间

2005年08月30日

【期刊论文】The effect of silicon addition on thermoelectric properties of a B4C ceramic

蔡克峰， Ke-feng Cai a， b， *， Ce-Wen Nan a， Xin-min Min a

K.-f. Cai et al./Materials Science and Engineering B 67(1999)102-107，-0001，（）：

-1年11月30日

A B4C ceramic doped with 0.2 at% Si is prepared via hot pressing. The composition and microstructure of the ceramic are characterized by means of X-ray diffraction (XRD) and electron probe microanalysis (EPMA). The electrical conductivity and Seebeck coefficient of the ceramic samples are measured from room temperature up to 1500 K. The electrical conductivity increases with temperature; the Seebeck coefficient also increases with temperature and rises to a value of about 320μV K-1 at 1500K. The value of the figure of merit of 0.2 at% Si-doped B4C is higher than that of undoped B4C and rises to about 1×10-4K-1 at 1500K. The reason for enhancement in the figure of merit of Si-doped B4C is discussed.

Boron carbide， Ceramics， Hot pressing， Thermoelectric properties

45浏览
0点赞
0收藏
0分享
197下载
0

引用

上传时间

2005年08月30日

【期刊论文】Sol-gel processing of ZnO-coated TiB2 composite powders

蔡克峰， K. F. Cai a， b， *， E. Mueller a， C. Drasar a， A. Mrotzek a

K. F. Cai et al./Materials Letters 57(2003)4251-4255，-0001，（）：

-1年11月30日

摘要

A sol-gel method for the preparation of ZnO-coated TiB2 composite powders, using inexpensive zinc acetate, is described. It yields composite powders of TiB2 particles coated with fine ZnO grains. The composite powders can be hot pressed at relatively low temperature and a 10 vol.%TiB2-ZnO sample shows much better thermoelectric (TE) properties than pure ZnO ceramic.

Composite materials， Sol-gel preparation， Thermal properties， Electrical properties

14浏览
0点赞
0收藏
0分享
111下载
0

引用

上传时间

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

25浏览
0点赞
0收藏
0分享
347下载
0

引用

上传时间

2005年08月30日

【期刊论文】Preparation, microstructure and properties of reaction-bonded AIN ceramics

蔡克峰， K. F. Cai*，， D. S. McLachlan

K. F. Cai, D. S. McLachlan/Materials Research Bulletin 37(2002)575-581，-0001，（）：

-1年11月30日

摘要

AIN ceramics were prepared via aa reaction-bonding technique, using Al and AIN powders as the starting materials. The effects of processing parameters and CaO as an additive were investigated. An AIN ceramic sintered at 1800℃ with 0.5 wt.% CaO is highly densified and its dielectric constant and dielectric loss tgδ are 9.4 and 0.0002 at 1 MHz, respectively, Its electrical resistivity and Vickers hardness are 2.88×1012Ωcm, 1210kg/mm2, respectively.

A.， Nitrides， A.， Ceramics， B.， Chemical synthesis， C.， X-ray diffraction， D.， Dielectric properties

9浏览
0点赞
0收藏
0分享
79下载
0

引用

上传时间

2005年08月30日

【期刊论文】Preparation of AlON-TiC composites via reaction-bonding

蔡克峰， K. F. Cai a， b， c， *， D. S. McLachlan b

K. F. Cai, D. S. McLachlan/Materials Research Bulletin 40(2005)447-451，-0001，（）：

-1年11月30日

摘要

AlON-TiC composites were fabricated via a reaction-bonding technique, using Al, Al2O3 and TiC powders as the starting materials. A composite sample sintered at 1850℃ after nitriding is highly densified and the Vickers hardness and fracture toughness of the sample are about 1751.1 kg/mm2 and 5.3 MPa m1/2, respectively. The composition and microstructure of the sample are characterized by means of XRD and SEM/EDX.

A: Composites， B: Chemical synthesis， D: Mechanical properties， D: Microstructure

17浏览
0点赞
0收藏
0分享
71下载
0

引用