Relation between fracture surface area of a flexural strength specimen and fracture toughness for WC-10mass%Co cemented carbide and Si3N4 ceramics

1996 ◽  
Vol 209 (1-2) ◽  
pp. 169-174 ◽  
Author(s):  
Yutaka Yanaba ◽  
Koji Hayashi
Keyword(s):  
Fracture Toughness ◽  
Fracture Surface ◽  
Flexural Strength ◽  
Surface Area ◽  
Cemented Carbide ◽  
Si3n4 Ceramics

scholarly journals C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1428
Author(s):  
Heng Luo ◽  
Chen Li ◽  
Lianwen Deng ◽  
Yang Li ◽  
Peng Xiao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
Mechanical Performance ◽  
Sintering Temperature ◽  
Hot Press ◽  
Pull Out ◽  
Hot Press Sintering ◽  
Si3n4 Ceramics

In situ grown C0.3N0.7Ti and SiC, which derived from non-oxide additives Ti3SiC2, are proposed to densify silicon nitride (Si3N4) ceramics with enhanced mechanical performance via hot-press sintering. Remarkable increase of density from 79.20% to 95.48% could be achieved for Si3N4 ceramics with 5 vol.% Ti3SiC2 when sintered at 1600 °C. As expected, higher sintering temperature 1700 °C could further promote densification of Si3N4 ceramics filled with Ti3SiC2. The capillarity of decomposed Si from Ti3SiC2, and in situ reaction between nonstoichiometric TiCx and Si3N4 were believed to be responsible for densification of Si3N4 ceramics. An obvious enhancement of flexural strength and fracture toughness for Si3N4 with x vol.% Ti3SiC2 (x = 1~20) ceramics was observed. The maximum flexural strength of 795 MPa for Si3N4 composites with 5 vol.% Ti3SiC2 and maximum fracture toughness of 6.97 MPa·m1/2 for Si3N4 composites with 20 vol.% Ti3SiC2 are achieved via hot-press sintering at 1700 °C. Pull out of elongated Si3N4 grains, crack bridging, crack branching and crack deflection were demonstrated to dominate enhance fracture toughness of Si3N4 composites.

A Comparison between B4C-ZrB2-Al Composite and B4C-Al Composite on Microstructure and Mechanical Properties

2011 ◽  
Vol 279 ◽  
pp. 71-76 ◽  
Author(s):  
Peng Lü
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Fracture Surface ◽  
Flexural Strength ◽  
Fracture Mode ◽  
Transgranular Fracture ◽  
Aluminum Addition ◽  
Microstructure And Mechanical Properties ◽  
Al Composite ◽  
Toughness Improvement

B4C-Al and B4C-ZrB2-Al composites were fabricated by infiltrating aluminum into porous B4C and B4C-ZrB2 preforms in vacuum. The effect of ZrB2 addition on the microstucture and mechanical properties of the B4C-Al composites were investigated. The flexural strength and the fracture toughness of composite improved greatly as the result of ZrB2 addition. The ZrB2 addition inhibited the reaction between B4C and Al. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. Inter/transgranular fracture mode with many tear ridges and dimples was showing in the fracture surface of the B4C-ZrB2-Al composite. The relationships between the microstructures and the mechanical properties of the B4C-ZrB2-Al composites were discussed.

Influence of Carbon Cloth Filaments Upon the Properties of 2D C/SiC via Precursor Infiltration and Pyrolysis Process

2008 ◽  
Vol 368-372 ◽  
pp. 1041-1043 ◽  
Author(s):  
Feng Zhang ◽  
Hai Feng Hu ◽  
Qi Kun Wang ◽  
Yu Di Zhang ◽  
Chang Rui Zhang
Keyword(s):  
Fracture Toughness ◽  
Fracture Surface ◽  
Flexural Strength ◽  
Volume Ratio ◽  
Carbon Cloth ◽  
Pyrolysis Process ◽  
Fiber Volume ◽  
Sic Composites

In this paper, 2D C/SiC composites with different carbon cloth filaments (1K, 3K) were prepared via precursor infiltration and pyrolysis (PIP) process. The flexural strength of 2D-1K C/SiC composites was 380MPa, and fracture toughness was 16.8MPa-m1/2, while those of 2D-3K C/SiC were 305MPa and 14.4MPa-m1/2, respectively. The differences of these two composites were analyzed from fiber volume ratio in the composites, density, and fracture surface (SEM) of the samples.

scholarly journals C0.3N0.7Ti-SiC Toughed Silicon Nitride Hybrids with Non-Oxide Additives Ti3SiC2

2020 ◽  
Author(s):  
Heng Luo ◽  
Chen Li ◽  
Lianwen Deng ◽  
Yang Li ◽  
Peng Xiao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Flexural Strength ◽  
Mechanical Performance ◽  
Crack Deflection ◽  
Crack Branching ◽  
Hot Press ◽  
Pull Out ◽  
Si3n4 Ceramics

In-situ grown C0.3N0.7Ti and SiC, which derived from non-oxide additives Ti3SiC2, are proposed to densify silicon nitride (Si3N4) ceramics with enhanced mechanical performance. Remarkable increase of density from 79.20% to 95.48% could be achieved for Si3N4 ceramics with 5vol% Ti3SiC2. The capillarity of decomposed Si from Ti3SiC2, and in-situ reaction between nonstoichiometric TiCx and Si3N4 were believed to be responsible for densification of Si3N4 ceramics. An obvious enhancement of flexural strength and fracture toughness for Ti3SiC2 doped Si3N4 ceramics was observed. The maximum flexural strength of 795 MPa for Si3N4 composites with 5vol% Ti3SiC2 and maximum fracture toughness of 6.97 MPa.m1/2 for Si3N4 composites with 20vol% Ti3SiC2 are achieved when mixed powders are hot-press sintered at 1700℃. Pull out of elongated Si3N4 grains, crack bridging, crack branching and crack deflection were demonstrated to dominate enhance fracture toughness of Si3N4 composites.

A Comparison between B4C-TiB2-Al Composite and B4C-Al Composite on Microstructure and Mechanical Properties

2011 ◽  
Vol 66-68 ◽  
pp. 255-259
Author(s):  
Peng Lü ◽  
Fang Yu ◽  
Hong Qiang Ru
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Fracture Surface ◽  
Flexural Strength ◽  
Fracture Mode ◽  
Transgranular Fracture ◽  
Aluminum Addition ◽  
Microstructure And Mechanical Properties ◽  
Al Composite ◽  
Toughness Improvement

B4C-Al and B4C-TiB2-Al composites were fabricated by infiltrating aluminum into porous B4C and B4C-TiB2preforms in vacuum. The effect of TiB2addition on the microstucture and mechanical properties of the B4C-Al composites were investigated. The flexural strength and the fracture toughness of composite improved greatly as the result of TiB2addition. The TiB2addition inhibited the reaction between B4C and Al. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. Inter/transgranular fracture mode with many tear ridges and dimples was showing in the fracture surface of the B4C-TiB2-Al composite. The relationships between the microstructures and the mechanical properties of the B4C-TiB2-Al composites were discussed.

New route to improve the fracture toughness and flexural strength of Si3N4 ceramics by adding FeSi2

2017 ◽  
Vol 126 ◽  
pp. 11-14 ◽  
Author(s):  
Lujie Wang ◽  
Qian Qi ◽  
Ping Cai ◽  
Hui Zhang ◽  
Xiao Yang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Si3n4 Ceramics

Effects of Nano-Al2O3 on the Mechanical Property and Microstructure of Nano-Micro Composite Self-Lubricating Ceramic Tool Material

2013 ◽  
Vol 770 ◽  
pp. 308-311 ◽  
Author(s):  
Ming Dong Yi ◽  
Chong Hai Xu ◽  
Zhao Qiang Chen ◽  
Guang Yong Wu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Tool Material ◽  
Ceramic Tool ◽  
Ceramic Tool Material ◽  
Composite Self ◽  
Microstructure And Mechanical Property ◽  
Grain Refinement Strengthening

A new nanomicro composite self-lubricating ceramic tool material was prepared with vacuum hot pressing technique. The effect of nanoAl2O3 powders on the microstructure and mechanical properties of nanomicro composite self-lubricating ceramic tool material was investigated. With the increase of nanoAl2O3 content, the hardness and fracture toughness first up then down. When the nanoAl2O3 content is 4 vol.%, the flexural strength, hardness and fracture toughness reaches 562 MPa, 8.46 MPa·m1/2 and 18.95 GPa, respectively. The microstructure and mechanical property of nanomicro composite self-lubricating ceramic tool material can be improved by the grain refinement strengthening of nanoAl2O3.

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