Microstructure and properties of silicon nitride-matrix ceramic composites

1998 ◽  
Vol 39 (1) ◽  
pp. 22-25
Author(s):  
I. Yu. Kelina ◽  
V. A. Drobinskaya ◽  
L. A. Plyasunkova
Keyword(s):  
Silicon Nitride ◽  
Ceramic Composites ◽  
Microstructure And Properties

Effect of TiX(X=C, N, O) additives on microstructure and properties of silicon nitride based ceramics

2005 ◽  
Vol 53 (6) ◽  
pp. 669-673 ◽  
Author(s):  
R DUAN ◽  
G ROEBBEN ◽  
J VLEUGELS ◽  
O VANDERBIEST
Keyword(s):  
Silicon Nitride ◽  
Microstructure And Properties

Microstructure and Properties of Calcium Borosilicate and Borosilicate Glass-Ceramic Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1422-1425 ◽  
Author(s):  
An Guo Lu ◽  
Tai Qiu
Keyword(s):  
Borosilicate Glass ◽  
Glass Ceramic ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Ceramic Composites ◽  
Glass Content ◽  
Microstructure And Properties ◽  
Calcium Borosilicate ◽  
Crystal Phases

Calcium borosilicate (CaO-B2O3-SiO2, CBS) glass based glass-ceramic composites were prepared by introducing borosilicate glass. The effects of borosilicate glass and firing temperature on the microstructure and properties of the glass-ceramic composites were investigated. The results showed that the composites containing 0~40% (in mass fraction, the same below) borosilicate glass can be sintered at 850°C. The dielectric constant (εr) decreases with the increase of borosilicate glass content and can be adjusted in the range of 5.6~6.6. The coefficient of thermal expansion (CTE) increases with the increase of borosilicate glass content. Increasing sintering temperature favors the precipitations of crystal phases, which have lower εr than CBS glass, resulting in the decrease of εr for the composites.

Effect of SNNWS content on the microstructure and properties of SNNWS/Si-C-N ceramic composites via PIP

2018 ◽  
Vol 44 (5) ◽  
pp. 5102-5108 ◽  
Author(s):  
Yuanyi Zheng ◽  
Duan Li ◽  
Bin Li ◽  
Shitao Gao ◽  
Xuejin Yang
Keyword(s):  
Ceramic Composites ◽  
Microstructure And Properties

Thermal Diffusivity Imaging of Ceramic Composites

1993 ◽  
Author(s):  
K. Elliott Cramer ◽  
William P. Winfree ◽  
Edward R. Generazio ◽  
Ramakrishna Bhatt ◽  
Dennis S. Fox ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Silicon Nitride ◽  
Matrix Material ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Ceramic Composites ◽  
Fiber Direction ◽  
Large Area

Strong, tough, high temperature ceramic matrix composites are currently being developed for application in advanced heat engines. One of the most promising of these new materials is a SiC fiber-reinforced silicon nitride ceramic matrix composite (SiCf/Si3N4). The interfacial shear strength in such composites is dependant on the integrity of the fiber’s carbon coating at the fiber-matrix interface. The integrity of the carbon rich interface can be significantly reduced if the carbon is oxidized. Since the thermal diffusivity of the fiber is greater than that of the matrix material, the removal of carbon increases the contact resistance at the interface reducing the thermal diffusivity of the composite. Therefore thermal diffusivity images can be used to characterize the progression of carbon depletion and degradation of the composite. A new thermal imaging technique has been developed to provide rapid large area measurements of the thermal diffusivity perpendicular to the fiber direction in these composites. Results of diffusivity measurements will be presented for a series of SiCf/Si3N4 (reaction bonded silicon nitride) composite samples heat-treated under various conditions. Additionally, the ability of this technique to characterize damage in both ceramic and other high temperature composites will be shown.

Microstructure and properties of silicon nitride ceramics with calcium aluminate additions

2010 ◽  
Vol 46 (7) ◽  
pp. 799-803 ◽  
Author(s):  
Yu. F. Kargin ◽  
A. S. Lysenkov ◽  
S. N. Ivicheva ◽  
A. I. Zakharov ◽  
N. A. Popova ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Calcium Aluminate ◽  
Microstructure And Properties ◽  
Nitride Ceramics

Wettability of silicon nitride ceramic composites by silver, copper and silver copper titanium alloys

2005 ◽  
Vol 25 (10) ◽  
pp. 1757-1763 ◽  
Author(s):  
Robert Klein ◽  
Martine Desmaison-Brut ◽  
Patrick Ginet ◽  
Alida Bellosi ◽  
Jean Desmaison
Keyword(s):  
Silicon Nitride ◽  
Titanium Alloys ◽  
Ceramic Composites ◽  
Silicon Nitride Ceramic ◽  
Silver Copper

Development of CNT-Silicon Nitrides with Improved Mechanical and Electrical Properties

2006 ◽  
Vol 45 ◽  
pp. 1723-1728 ◽  
Author(s):  
Csaba Balázsi ◽  
Ferenc Wéber ◽  
Péter Arató ◽  
Balazs Fényi ◽  
Norbert Hegman ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Electrical Properties ◽  
Room Temperature ◽  
Hot Isostatic Pressing ◽  
Ceramic Composites ◽  
X Ray Diffraction ◽  
Nano Structure ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Gas Pressure Sintering

This work is focusing on exploring preparing processes to tailor the microstructure of carbon nanotube (CNT) reinforced silicon nitride-based ceramic composites. Samples with different porosity’s and different amount (1, 3 or 5 wt%) of carbon nanotubes have been prepared by using gas pressure sintering or hot isostatic pressing. In comparison, composites with 1wt%, 5wt% or 10wt% carbon black and graphite have been manufactured. We measured the room temperature mechanical and electrical properties, examined the micro and nano structure by X-ray diffraction and electron microscopy. It was found that it is possible to develop CNT-silicon nitride composite for applications where a decent electric conductivity and good mechanical properties are required.

scholarly journals DC conductivity of silicon nitride based carbon-ceramic composites

2007 ◽  
Vol 1 (1-2) ◽  
pp. 57-61 ◽  
Author(s):  
B. Fényi ◽  
N. Hegman ◽  
F. Wéber ◽  
P. Arató ◽  
Cs. Balázsi
Keyword(s):  
Silicon Nitride ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Electrical Conductor ◽  
Silicon Nitride Ceramic ◽  
Carbon Additives ◽  
Nitride Ceramics ◽  
Conductivity Range ◽  
Carbon Ceramic ◽  
Insulating Properties

The silicon nitride ceramics are usually known as strongly refractory and enduring materials and have typical electrically insulating properties. If the reinforcing phase of ceramic composite (that is mainly put in the material to improve mechanical properties) is a good electrical conductor, it is worth to investigate the composite in electrical aspect. In this work carbon nanotubes, black-carbon and graphite were added to the basic silicon nitride ceramic and the electrical conductivity of the prepared carbon-ceramic composites was determined. The conductivity of the ceramic composites with different type and concentration of the carbon additives was observed by applying four point DC resistance measurements. Insulator and conductor composites in a wide conductivity range can be produced depending on the type and quantity of the additives. The additive types as well as the sintering parameters have influence on the basic electrical properties of the conductor composites.

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