scholarly journals Fabrication of Dense TiB2/[ZrO2-Al2O3] Composites with Both High Hardness (≥20 GPa) and Fracture Toughness (≥12 MPa·m1/2) Simultaneously by Pulsed Electric-current Pressure Sintering

2019 ◽  
Vol 66 (7) ◽  
pp. 339-348
Author(s):  
Ken HIROTA ◽  
Masashi YOSHIDA ◽  
Xiaoteng GE ◽  
Yuta KOSUGA ◽  
Masaki KATO ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Electric Current ◽  
High Hardness ◽  
Pulsed Electric Current

Pulsed Electric Current Sintered Cr2O3-rGO Composites

2016 ◽  
Vol 721 ◽  
pp. 419-424
Author(s):  
M. Erkin Cura ◽  
Vivek Kumar Singh ◽  
Panu Viitaharju ◽  
Joonas Lehtonen ◽  
Simo Pekka Hannula
Keyword(s):  
Fracture Toughness ◽  
Graphene Oxide ◽  
Electric Current ◽  
Chromium Oxide ◽  
High Hardness ◽  
High Wear Resistance ◽  
Carbide Formation ◽  
Indentation Fracture ◽  
Pulsed Electric Current ◽  
Indentation Fracture Toughness

Chromium oxide is a promising material for applications where excellent corrosion resistance, high hardness, and high wear resistance are needed. However, its use is limited because of low fracture toughness. Improvement of fracture toughness of chromium oxide while maintaining its afore mentioned key properties is therefore of high interest. In this communication we study the possibility of increasing the toughness of pulsed electric current sintered (PECS) chromium oxide by the addition of graphene oxide (GO). The indentation fracture toughness was improved markedly with the addition of graphene oxide. Materials prepared by direct chemical homogenization had better fracture toughness. In composites with 10 vol.% GO piling of thin graphene oxide layers resulted in the formation of graphite layers between Cr2O3 and in carbide formation, which were observed to be the main reasons for the degradation of the mechanical properties. The distribution of graphene oxide was more homogeneous, when the GO amount was 0.1 vol.% and the formation of graphitic layers were avoided due to lesser amount of GO as well as ultrasonic treatment following the ball milling.

Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering

2007 ◽  
Vol 534-536 ◽  
pp. 1153-1156 ◽  
Author(s):  
Koji Shimojima ◽  
Hiroyuki Hosokawa ◽  
Takeshi Nakajima ◽  
Masahiko Mizukami ◽  
Yoshiharu Yamamoto
Keyword(s):  
Mechanical Properties ◽  
Tungsten Carbide ◽  
Electric Current ◽  
Applied Pressure ◽  
High Hardness ◽  
Maximum Temperature ◽  
Pulsed Electric Current ◽  
Binder Free ◽  
Field Assisted Sintering ◽  
Sintering Condition

In this paper, we show some experimental results of binder-free WC sintered by Pulsed Electric Current Sintering (PECS) also known as Field Assisted Sintering Technology (FAST). These binder-free WC have extremely high hardness and stiffness. However, these mechanical properties are dependent on the sintering condition, e.g., maximum temperature, applied pressure, etc. We show some relationship between mechanical properties and sintering condition to improve to sinter the binder-free WC.

Mechanical Properties of Alumina Based Nanocomposites

2012 ◽  
Vol 527 ◽  
pp. 101-106 ◽  
Author(s):  
Erkka Kannisto ◽  
M. Erkin Cura ◽  
Erkki Levänen ◽  
Simo Pekka Hannula
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Electric Current ◽  
Critical Size ◽  
Rule Of Mixtures ◽  
Microstructure And Mechanical Properties ◽  
Nickel Particles ◽  
Pulsed Electric Current

To study the microstructure and mechanical properties of alumina nanocomposites, Al2O3/2.5 vol.% Ni and Al2O3/10 vol.% ZrO2 nanocomposites were consolidated by pulsed electric current sintering (PECS). Fracture toughness was found to increase by 13 % and 16 % respectively compared to reference alumina. Hardness increased slightly in Al2O3/Ni because of a fraction of nickel particles under the critical size (2 following the rule of mixtures. By investigating the results, causes of improved mechanical properties were critically evaluated.

Simultaneous Synthesis and Consolidation of W-Added ZrB2 by Pulsed Electric Current Pressure Sintering and their Mechanical Properties

2007 ◽  
Vol 561-565 ◽  
pp. 527-530 ◽  
Author(s):  
Hirota Ken ◽  
Takaya Endo ◽  
Kato Masaki ◽  
Shingo Nakane ◽  
Toshiyuki Nishimura ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Fracture Toughness ◽  
Electric Current ◽  
Room Temperature ◽  
Bending Strength ◽  
Zirconium Boride ◽  
Formation Processes ◽  
Pulsed Electric Current ◽  
Simultaneous Synthesis

Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have been fabricated directly from mixtures of constituent elemental powders by pulsed electric current pressure sintering (PECPS) at 1800°C for 10 min under 30 MPa in a vacuum. Formation processes of monolithic, W-doped ZrB2 solid solutions (Zr1-xWx)B2 (0<x≤0.12), and composites consisting of ZrB2(ss) and WB2 were investigated. Their mechanical properties of Vickers hardness (Hv), fracture toughness (KIC), and bending strength (σb) at room temperature were evaluated. Solid solution and composite materials gave higher Hv (~20.7 GPa), KIC (∼4.4 MPam1/2), and σb (~600 and 690 MPa for the former and the latter, respectively) than those (14.1 GPa, 3.21 MPam1/2, and ~500 MPa) of the monolithic ZrB2 fabricated under the same conditions. Furthermore, the latter two materials exhibited excellent high-temperature σb values (~550-600 MPa) up to 1600°C in N2, in comparison with that (~320 MPa) of monolithic ZrB2 materials.

ALMANITE W

Alloy Digest ◽  
1974 ◽  
Vol 23 (3) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Impact Strength ◽  
Surface Treatment ◽  
High Hardness ◽  
Heat Treating ◽  
Austenitic Matrix ◽  
Matrix Type ◽  
Martensitic Matrix ◽  
Cast Condition

Abstract ALMANITE W comprises a series of three types of austenitic-martensitic white irons characterized by high hardness and relatively good impact strength. Type W1 has a pearlitic matrix. Type W2 has a martensitic matrix, Type W4 is highly alloyed to provide an austenitic matrix in the as-cast condition which may be further modified to give a martensitic matrix by heat treatment or by refrigeration. This datasheet provides information on composition, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on casting, heat treating, machining, and surface treatment. Filing Code: CI-42. Producer or source: Meehanite Metal Corporation.

HOWMET No. 3

Alloy Digest ◽  
1968 ◽  
Vol 17 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
High Hardness ◽  
Heat Treating ◽  
High Heat ◽  
Cobalt Base Alloy ◽  
Metal Products ◽  
Cobalt Base

Abstract HOWMET No. 3 is a cobalt-base alloy having high hardness and compressive strength, high heat and corrosion resistance, along with excellent abrasion and wear resistance. It is recommended for bushings, scrapers, valve parts, and other machinery components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Co-56. Producer or source: Howmet Corporation Metal Products Division.

CYCLOPS 62

Alloy Digest ◽  
1966 ◽  
Vol 15 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Cold Work ◽  
High Hardness ◽  
Heat Treating ◽  
High Tempering

Abstract Cyclops 62 is an air-hardening tool steel with exceptional resistance to softening when tempering. It is recommended for cold work applications where high hardness after high tempering temperatures is a requirement. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-181. Producer or source: Cyclops Corporation.

DOUBLE SEVEN

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Cold Working ◽  
High Hardness ◽  
Heat Treating ◽  
Heavy Duty ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium

Abstract DOUBLE SEVEN is an air hardening high-carbon high-chromium tool and die steel having high hardness and wear resistance. It is recommended for shear blades, cold working tools, and heavy duty dies. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-124. Producer or source: Edgar Allen & Company Ltd, Imperial Steel Works.

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