A study on in-situ synthesis of TiB2–SiC ceramic composites by reactive hot pressing

2014 ◽  
Vol 40 (1) ◽  
pp. 2305-2313 ◽  
Author(s):  
Guolong Zhao ◽  
Chuanzhen Huang ◽  
Hanlian Liu ◽  
Bin Zou ◽  
Hongtao Zhu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Ceramic Composites ◽  
In Situ Synthesis ◽  
Sic Ceramic ◽  
Reactive Hot Pressing

Synthesis and Properties of Ti3SiC2/SiC Ceramic Composites

2005 ◽  
Vol 475-479 ◽  
pp. 1243-1246 ◽  
Author(s):  
Tong Wei Lin ◽  
Wen Bin Cao ◽  
Jiang Tao Li ◽  
Chang Chun Ge
Keyword(s):  
Phase Composition ◽  
Active Carbon ◽  
Hot Pressing ◽  
Ceramic Composites ◽  
Displacement Reaction ◽  
Starting Mixture ◽  
Sic Ceramic ◽  
Different Content

Ti3SiC2/SiC ceramic composites with different content of SiC were synthesized through in-situ solid displacement reaction by hot pressing from starting mixture powders of TiC, Si and active carbon. The densities of the specimens were measured, the phase composition of the specimens was identified by XRD, and the microstructures were observed by SEM.

In-situ synthesis of Si3N4 - SiC composites by reactive hot-pressing

1999 ◽  
Vol 31 (5) ◽  
pp. 499-506 ◽  
Author(s):  
Hiroshi Mabuchi ◽  
Hiroshi Tsuda ◽  
Takeshi Ohtsuka ◽  
Toshiyuki Matsui ◽  
Kenji Morii
Keyword(s):  
Hot Pressing ◽  
In Situ Synthesis ◽  
Sic Composites ◽  
Reactive Hot Pressing

Strengthening Effect of In-Situ Dispersed Hexagonal Boron Nitride in Ceramic Composites

2006 ◽  
Vol 317-318 ◽  
pp. 163-166
Author(s):  
Guo Jun Zhang ◽  
Hideki Kita ◽  
Naoki Kondo ◽  
Tatsuki Ohji
Keyword(s):  
Grain Size ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
High Strength ◽  
Ceramic Composites ◽  
Strengthening Effect ◽  
Mechanical Shock ◽  
Metallic Particles ◽  
Reactive Hot Pressing

High strength particulate ceramic composites are in general reinforced by strong dispersoids, such as strong ceramic particles (SiC, TiB2, ZrO2, et al) and strong metallic particles (Mo, W, et al). In this work high strength ceramic composites with in-situ synthesized hexagonal boron nitride (h-BN) have been prepared and characterized. As an example, we manufactured mullite-BN composites by reactive hot pressing (RHP) using aluminum borates (9Al2O3·2B2O3 and 2Al2O3·B2O3) and silicon nitride as starting materials. The obtained material RHPed at 1800°C showed a strength of 540 MPa, which was 1.64 times higher than that of the monolithic mullite ceramics. TEM observation revealed that the composite had an isotropic microstructure with a fine mullite matrix grain size of less than 1 μm and a nano-sized h-BN platelets of about 200 nm in length and 60∼80 nm in thickness. The high strength was suggested to be from the reduced matrix grain size and the small toughening effect by the h-BN platelets. In addition, this kind of ceramic composite demonstrates low Young’s modulus that is beneficial to the thermal/mechanical shock resistance, and excellent machinability.

Reactive hot pressing of aluminum matrix composites

1999 ◽  
Vol 14 (11) ◽  
pp. 4246-4250
Author(s):  
H. J. Brinkman ◽  
J. Duszczyk ◽  
L. Katgerman
Keyword(s):  
Hot Pressing ◽  
Adverse Reactions ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Processing Step ◽  
Exothermic Process ◽  
Composite Product ◽  
Reactive Hot Pressing

A method is described for the production of dense aluminum matrix composites from elemental powders in one processing step by reactive hot pressing (RHP). It encompasses both the exothermic conversion of reactants to composite product and the following hot compaction of the porous composite product. The RHP method described in this paper takes into account the gas evolution accompanying the exothermic process, ensures complete conversion of reactants, and avoids adverse reactions between aluminum matrix and graphite tooling material. In situ sample temperature measurements enable proper process control, in particular the timing of the full densification step of the hot reaction product.

Reaction Synthesized Boron Nitride-Containing Composites (BNCC)

2007 ◽  
Vol 280-283 ◽  
pp. 1385-1390
Author(s):  
Guo Jun Zhang ◽  
Tatsuki Ohji ◽  
Shuzo Kanzaki
Keyword(s):  
Boron Nitride ◽  
Hot Pressing ◽  
High Performance ◽  
Hexagonal Boron Nitride ◽  
High Strength ◽  
Reactive Sintering ◽  
Boron Source ◽  
Inorganic Reactions ◽  
Reactive Hot Pressing

Based on the proposed inorganic reactions a series of high performance hexagonal boron nitride-containing composites (BNCC), include SiC-BN, Si3N4-SiC-BN, SiAlON-BN, AlN-BN, Al2O3-BN, AlON-BN and mullite-BN, have been prepared via reactive hot pressing or pressureless reactive sintering. Various boron-bearing components such as B, B4C, AlB2, SiB4, SiB6, B2O3 or H3BO3, 9Al2O3×2B2O3 (9A2B) and 2Al2O3×B2O3 (2AB) are used as the boron source. On the other hand, nitrogen gas or solid state nitirgen-bearing metal nitrides such as Si3N4 and AlN can be used as the nitrogen source. The in situ synthesized composites demonstrated homogeneous and isotropical microstructures with very fine (nano-sized) BN platelets or their agglomerates distributed in the matrixes. These composites showed high strength, low elasticity and improved strain tolerance. In this article the reaction design, thermodynamics, reaction mechanisms, reactive hot pressing or pressureless reactive sintering, microstructures and mechanical properties will be discussed.

scholarly journals The effect of various Co contents on the microstructure and properties of Ti(C,N)-TiB2-Co cermets prepared in situ via reactive hot pressing

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092571
Author(s):  
Xianrui Zhao ◽  
Ze Yu ◽  
Dunwen Zuo ◽  
Qintao Li ◽  
Mengxian Zhang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Relative Density ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Hardness Test ◽  
Reactive Hot Pressing ◽  
Compacting Pressure ◽  
Vickers Hardness Test ◽  
Scanning Electron

Ti(C,N)-TiB2-Co cermets were in situ synthesized, via reactive hot pressing from the Co-Ti-C-BN system, with a Co content ranging from 6 to 22 wt%. The microstructure, relative density, hardness, and fracture toughness of the sintered compacts was investigated by light microscopy, scanning electron microscopy, ceramic densitometry, and Vickers hardness test. The investigations indicate that during hot pressing (compacting pressure = 30 MPa), when the Co content is 14–22 wt%, the metal binder is extruded. Co and Ti are included in the extrudate, breaking the original ratio and deteriorating the properties of the sintered products. As the Co content increases from 6 wt% to 12 wt%, the porosity increases, and the relative density increases from 97.2% to 99.5%. The fracture toughness increases from 6.1 to 6.8 MPa m1/2. The Vickers hardness first increases from 1897 HV10 to the maximum 1960 HV10 and then decreases slightly to 1945 HV10.

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