scholarly journals Effect of Crack Healing of SiC according to Times of SiO2 Colloid Coating

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Ki Woo Nam
Keyword(s):  
Heat Treatment ◽  
Hydrostatic Pressure ◽  
Crack Width ◽  
Crack Healing ◽  
Roll Coating ◽  
Large Crack ◽  
Sic Ceramics ◽  
Coating Method ◽  
The Times ◽  
Critical Times

Crack healing behavior of SiC ceramics with large crack width has been studied as a function of coating and heat treatment. The SiO2 colloid coating was carried out on two types: hydrostatic pressure coating and roll coating. The crack healing was one hour at 1173 K in air. The crack part formed SiO2 oxides until the critical times by a hydrostatic pressure method. The crack does not anymore heal if it exceeds the critical times. The crack part and the base part have many O components and Si components regardless of the times of coating and heat treatment. The combined hydrostatic and rolling coating method did not have nearly an effect on crack-healing for large crack width over 1.4 μm. The study for more effective healing of a large crack width must be carried out in the future.

Crack-healing ability and strength recovery of different hot-pressed TZ3Y20A–SiC ceramics by heat treatment in air

2015 ◽  
Vol 67 ◽  
pp. 324-329 ◽  
Author(s):  
Xiu-Ping Zhang ◽  
Jia-Hu Ouyang ◽  
Zhan-Guo Liu ◽  
Yu-Jin Wang ◽  
Ya-Ming Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Crack Healing ◽  
Sic Ceramics ◽  
Strength Recovery

Sol-Gel Derived Titania/Hydroxyapatite Layer on Titanium Substrate

2011 ◽  
Vol 117-119 ◽  
pp. 332-334 ◽  
Author(s):  
Wen Yan Wang ◽  
Yu Wu ◽  
Jing Pei Xie ◽  
Gao Lu ◽  
Xiao Ming Dong ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Quality ◽  
Phase Formation ◽  
Volume Fraction ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Titanium Substrate ◽  
Gel Method ◽  
Good Surface ◽  
Coating Method

In this study, calcium nitrate(Ca(NO3)2•4H2O) and phosphorus pentoxide(P2O5) were used as precursor to prepare hydroxyapatite(HA) layer by sol-gel method, followed by a dipping-coating method to coat HA layer onto Ti. Phase formation and microstructure were investigated by XRD and SEM to study the influence of atmosphere on the property of HA layer. The results revealed that there exists no large cracks in the layer which was heated in the nitrogen, leading to a good surface quality compared with the layer which was heated in the air. And there is no obvious difference in crystallinity and volume fraction of HA in the layer when adopting heat treatment in different atmospheres.

Elastic Wave Signal Characteristics of SiC Ceramics with Crack Healing Ability by Wavelet Analysis

2005 ◽  
Vol 297-300 ◽  
pp. 2046-2051 ◽  
Author(s):  
Jin Wook Kim ◽  
B.W. Park ◽  
Seok Hwan Ahn ◽  
Ki Woo Nam
Keyword(s):  
Elastic Wave ◽  
Bending Strength ◽  
Spectral Characteristics ◽  
Compressive Load ◽  
Limited Range ◽  
Bending Test ◽  
Crack Healing ◽  
Sic Ceramics ◽  
Signal Characteristics ◽  
Ae Signals

This paper reports for signal characteristics of before-and-after healing treatment SiC ceramics with crack healing ability. The elastic wave signals generated during the compress load by a Vickers indenter on the brittle materials were recorded in real time, and the waveforms of the individual signals were examined and classified based on their spectral characteristics. The compress loads were applied with the range from 9.8N to 294N. In a bulk SiC specimen, the AE signals occurred only when the load was compressive loading and unloading. But, in the after crack healing specimen of 294N only, even though the external compressive load was stopped and kept on holding constant load states, the AE signals occurred irregularly and continuously. The results of the WT and frequency analysis showed that these existed as the property of frequency in the limited range between 100kHz and about 200kHz. Three-point bending test was performed for the cracked and healed SiC specimens. Consequently the bending strength of the crack healed specimens was recovered completely, but most of the samples with the crack healed showed that the properties of the dominant frequency were comparatively lower than that of the bulk SiC samples. The classification of the wave signals can be used to develop algorithms for autonomous health monitoring systems of brittle material structures.

Crack-healing behavior and static fatigue strength of Si3N4/SiC ceramics held under stress at temperature (800, 900, 1000 °C)

2003 ◽  
Vol 23 (11) ◽  
pp. 1971-1978 ◽  
Author(s):  
Koji Takahashi ◽  
Byung-Soo Kim ◽  
Min-Cheol Chu ◽  
Shigemi Sato ◽  
Kotoji Ando
Keyword(s):  
Fatigue Strength ◽  
Static Fatigue ◽  
Crack Healing ◽  
Sic Ceramics

Research on Poly Lactic Acid Solvent Coated Paper

2012 ◽  
Vol 200 ◽  
pp. 380-384
Author(s):  
Jing Lei Tai ◽  
Guang Xue Chen ◽  
Qi Feng Chen ◽  
Bao Lin Tang
Keyword(s):  
Oxygen Permeability ◽  
Water Vapor Permeability ◽  
Poly Lactic Acid ◽  
Vapor Permeability ◽  
Poly Ethylene Glycol ◽  
Coated Paper ◽  
Roll Coating ◽  
Coating Method ◽  
Poly Ethylene ◽  
Poly Caprolactone

This paper draws on a roll coating method which used for the production of coated paper. Polylactide coating cardboard was prepared through the solvent coating, and study its packaging performance. In this study, chloroform is based solvent, ethanol or n-propanol as auxiliary solvents, poly (ethylene glycol) or poly caprolactone as plasticizer, and the water vapor permeability, oxygen permeability and heat sealability of polylactic acid coated cardboard.

Crack-healing behavior of hot-pressed TZ3Y20A-SiC ceramics

2014 ◽  
Vol 40 (5) ◽  
pp. 6611-6615 ◽  
Author(s):  
Xiu-Ping Zhang ◽  
Jia-Hu Ouyang ◽  
Zhan-Guo Liu ◽  
Yu-Jin Wang ◽  
Yu Zhou
Keyword(s):  
Crack Healing ◽  
Sic Ceramics
Sign in / Sign up

Export Citation Format

Share Document