Flexural Strength, Fracture Toughness, and Hardness of Silicon Carbide and Boron Carbide Armor Ceramics

2010 ◽  
Vol 7 (5) ◽  
pp. 643-651 ◽  
Author(s):  
Lionel Vargas-Gonzalez ◽  
Robert F. Speyer ◽  
James Campbell
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Flexural Strength ◽  
Boron Carbide ◽  
Armor Ceramics

A Study on Reaction Bonded Ceramics Fabricated by Silicon Infiltration to B4C Preforms

2012 ◽  
Vol 724 ◽  
pp. 343-346 ◽  
Author(s):  
Rong Zhen Liu ◽  
Qing Wen Duan ◽  
Wen Wei Gu ◽  
Hai Yun Jin ◽  
Shao Chun Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Theoretical Result ◽  
Boron Carbide ◽  
Theoretical Calculation ◽  
Vickers Hardness ◽  
Volume Expansion ◽  
Maximum Density ◽  
Infiltration Process

Silicon was infiltrated into B4C preforms to fabricate B4C based composites ceramics at 1600 °C under vacuum circumstance. In this paper, silicon infiltration process was discussed by theoretical calculation. The volume expansion caused by reactions between silicon and boron carbide was about 89.1% from the calculation. In our study, the maximum density of B4C preform for the infiltration of silicon was about 1.5g/cm3 which was larger than theoretical result. The results of mechanical behavior showed that B4C based composites had excellent mechanical properties with a density lower than 2.6g/cm3, Vickers-hardness of this material was 27.2GPa, and this material showed a flexural strength of 349MPa and fracture toughness of 3.8 MPa*m1/2.

Fabrication and Properties of Cf/SiC Composites Derived from Polysiloxane Precursor

2011 ◽  
Vol 686 ◽  
pp. 419-422
Author(s):  
Tian Heng Xu ◽  
Qing Song Ma ◽  
Zhao Hui Chen
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Elemental Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vacuum Atmosphere ◽  
The Matrix ◽  
Sic Composites

Carbon fiber reinforced silicon carbide composites (Cf/SiC) were derived through precursor infiltration pyrolysis route (PIP) at 1600°C in vacuum atmosphere using polysiloxane as precursor. The matrix of Cf/SiC was characterized by X-ray diffraction and elemental analysis. The results show that crystalline β-SiC can be derived at 1600°C in vacuum from polysiloxane. The flexural strength and fracture toughness of polysiloxane derived from Cf/SiC can reach up to 70 MPa and 2.3MPa·m respectively1/2.

The rate-dependent fracture toughness of silicon carbide- and boron carbide-based ceramics

2015 ◽  
Vol 35 (16) ◽  
pp. 4411-4422 ◽  
Author(s):  
John Pittari ◽  
Ghatu Subhash ◽  
James Zheng ◽  
Virginia Halls ◽  
Phillip Jannotti
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Boron Carbide ◽  
Rate Dependent

Preparation of Cf/SiC Composites by Liquid Silicon Infiltration

2010 ◽  
Vol 434-435 ◽  
pp. 103-105 ◽  
Author(s):  
Chun Peng Wang ◽  
Jie Tang ◽  
Hai Lin Liu ◽  
Yan Li Huo ◽  
Yu Feng Chen ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Fracture Behavior ◽  
Binding Strength ◽  
Phenol Resin ◽  
Pure Carbon ◽  
Sic Composites ◽  
Fiber Preforms

The Cf/SiC made from carbon fiber preforms infiltrated by phenol resin, pure carbon slurry and aqueous C/SiC slurry showed different binding strength between carbon fiber and SiC matrix, thus influenced the fracture behavior of the composite. The fracture toughness of the Cf/SiC composites with the value of 9.82MPa•m1/2,improved remarkably compared with reaction- bonded silicon carbide (RBSC). But the flexural strength was less than 100 MPa, because of the existence of considerable amount of pores in C/SiC composites.

Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics

2009 ◽  
Vol 409 ◽  
pp. 350-353
Author(s):  
Alexandra Kovalčíková ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Crack Deflection ◽  
Liquid Phase Sintering ◽  
Crack Branching ◽  
Mechanical Interlocking ◽  
Heat Treated

The effect of the heat treatment on the fracture toughness and flexural strength of the silicon carbide – silicon nitride composites prepared by liquid-phase-sintering was investigated. The results were compared to those obtained for a reference silicon carbide material, prepared by the same fabrication route. The fracture toughness increased from 3.19 to 5.15 MPa.m1/2 due to the toughening mechanisms (crack deflection, mechanical interlocking, crack branching) occurring in the heat treated materials during the crack propagation. However, the flexural strength decreased after the heat treatment of the experimental materials. The strength of the investigated materials was degraded by the presence of processing flaws mainly in the form of pores, clusters of pores, and SiC agglomerates.

Boron Carbide-Silicon Carbide Laminated Ceramics for Ballistic Protection

Materials ◽  
2003 ◽  
Author(s):  
N. Orlovskaya ◽  
J. Adams ◽  
M. Chheda ◽  
J. Shih ◽  
S. Yarmolenko ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Residual Stresses ◽  
Boron Carbide ◽  
Ceramic Composites ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Ballistic Performance ◽  
Ballistic Protection ◽  
Impact Experiments

The paper describes the development of tough boron carbide-silicon carbide ceramic laminates with enhanced ballistic performance for armor application. Laminates with strong interfaces can provide high fracture toughness and damage tolerance along with improved ballistic protection. The enhancement of the mechanical/ballistic performance of laminates is obtained through design of controlled residual stresses in separate layers. The research produced a fundamental knowledge of the interrelationships between processing, residual stresses, and mechanical behavior of boron carbide based multilayered ceramic composites with an enhanced understanding of laminate’s fracture toughness, strength, and Young’s modulus. It was expected that the newly developed laminates would have necessary mechanical properties to increase maximum critical velocity of dwell/penetration transition during impact experiments.

Preparation of BN Coating on KD-II Silicon Carbide Fiber by Dip-Coating Process

2015 ◽  
Vol 816 ◽  
pp. 186-191 ◽  
Author(s):  
Bei Yang ◽  
Xin Gui Zhou ◽  
Jin Shan Yu ◽  
Hong Lei Wang
Keyword(s):  
Crystal Structure ◽  
Fracture Toughness ◽  
Silicon Carbide ◽  
Flexural Strength ◽  
Dip Coating ◽  
Strength Test ◽  
Coating Process ◽  
Silicon Carbide Fiber ◽  
Pyrolysis Process ◽  
Sic Composites

Boron nitride (BN) coating on KD-II silicon carbide fiber was prepared from boric acid and urea by a 4-circle dip-coating process. SiCf/SiC composites were prepared from the precursor LPVCS by a HP(heat pressure) assisted PIP(precursor infiltration and pyrolysis) process. The microstructure and crystal structure of the coatings were characterized by SEM and XRD. XPS was adapted to analysis the composition and contents of different elements on the surface of BN coating. The influence of dip-coating process to the fibers was studied by the monofilament strength test. As the results, the monofilament strengths of the dip-coated fibers decreased firstly and increased subsequently. The strengths were slightly higher (3.4%) than the original fiber after 4 circles. The average flexural strength and fracture toughness of the composites with BN coating are respectively 290.8 MPa and 12.09 MPa⋅m1/2, while those of composites without coating are 144.1 MPa and 6.72 MPa⋅m1/2, respectively.

DURALCAN F3S.xxS

Alloy Digest ◽  
1994 ◽  
Vol 43 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Compressive Strength ◽  
Aluminum Alloy ◽  
High Temperature ◽  
Base Alloy ◽  
Alloy Matrix ◽  
Reinforced Composite ◽  
Temperature Performance ◽  
Aluminum Alloy Matrix

Abstract Duralcan F3S.xxS is a heat treatable aluminum alloy-matrix gravity composite. The base alloy is similar to Aluminum 359 (Alloy Digest Al-188, July 1969); the discontinuously reinforced composite is silicon carbide. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and fatigue. It also includes information on high temperature performance. Filing Code: AL-329. Producer or source: Alcan Aluminum Corporation.

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