Densification of boron carbide powder during hot pressing

1979 ◽  
Vol 18 (5) ◽  
pp. 312-316
Author(s):  
I. T. Ostapenko ◽  
V. V. Slezov ◽  
R. V. Tarasov ◽  
N. F. Kartsev ◽  
V. P. Podtykan
Keyword(s):  
Boron Carbide ◽  
Hot Pressing ◽  
Carbide Powder

Fabrication of Carbon Nanotube Reinforced Boron Carbide Composite by Hot-Pressing Following Extrusion Molding

2014 ◽  
Vol 616 ◽  
pp. 27-31 ◽  
Author(s):  
Tomohiro Kobayashi ◽  
Katsumi Yoshida ◽  
Toyohiko Yano
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Elastic Modulus ◽  
Carbon Nanotube ◽  
Boron Carbide ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Bending Strength ◽  
Extrusion Direction ◽  
Sem Observation

The CNT/B4C composite with Al2O3 additive was fabricated by hot-pressing following extrusion molding of a CNT/B4C paste, and mechanical properties of the obtained composite were investigated. Many CNTs in the composite aligned along the extrusion direction from SEM observation. 3-points bending strength of the composite was slightly lower than that of the monolithic B4C. Elastic modulus and Vickers hardness of the composite drastically decreased with CNT addition. Fracture toughness of the composite was higher than that of the monolithic B4C.

scholarly journals Multi-Objective Optimization of Process Parameters for Powder Mixed Electrical Discharge Machining of Inconel X-750 Alloy Using Taguchi-Topsis Approach

2021 ◽  
Vol 71 (1) ◽  
pp. 1-18
Author(s):  
Basha Shaik Khadar ◽  
Raju M. V. Jagannadha ◽  
Kolli Murahari
Keyword(s):  
Boron Carbide ◽  
Process Parameters ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Optimization Technique ◽  
Dielectric Fluid ◽  
Carbide Powder ◽  
Powder Concentration ◽  
Pulse On Time ◽  
Pulse Off Time

Abstract The paper investigates the influence of boron carbide powder (B4C) mixed in dielectric fluid on EDM of Inconel X-750 alloy. The process parameters selected as discharge current (Ip), pulse on time(Ton), pulse off time(Toff), boron carbide(B4C) powder concentration to examine their performance responses on Material Removal Rate (MRR), Surface Roughness(Ra) and Recast Layer Thickness (RLT).In this study, o examine the process parameters which influence the EDM process during machining of Inconel X-750 alloy using combined techniques of Taguchi and similarity to ideal solutions (TOPSIS).Analysis of variance (ANOVA) was conducted on multi-optimization technique of Taguchi-TOPSIS. ANOVA results identified the best process parameters and their percentages. It developed the mathematical equation on Taguchi-TOPSIS performance characteristics results. The multi optimization results indicated that Ip and Toff are more significant parameters; V, and Ton parameters are less significant. Finally, surface structures were studied at optimized EDM conditions by using scanning electron microscope (SEM).

Purification of Attrition Milled Nano-size Boron Carbide Powder

2012 ◽  
Vol 05 ◽  
pp. 94-101 ◽  
Author(s):  
A. Sokhansanj ◽  
A.M. Hadian
Keyword(s):  
Chemical Analysis ◽  
Boron Carbide ◽  
Sintering Temperature ◽  
Milled Powder ◽  
Carbide Powder ◽  
Sintering Behavior ◽  
Sintered Ceramic ◽  
Weight Percentage ◽  
Wide Range ◽  
Nano Size

Boron carbide is one of the advanced ceramic materials which is used in a wide range of applications. However, this material needs a high sintering temperature (~2200°C). Using nano-size powders for producing ceramic parts results in lowering sintering temperature and also enhances toughness and hardness of the material. One of the methods for producing ceramic nano powders is attrition milling. However, as the milling balls and wall are made of steel, some impurities specially iron will be introduced to the powder during milling. Chemical analysis of the milled powder shows that more than 33wt% of the powder consists of iron. These uncontrolled impurities affect the mechanical and physical properties of sintered ceramic parts that are made of such a powder. Therefore, these impurities must be removed from the powder. Hydro metallurgical beneficiation technique with two different solvents has been used for purification of the powder. The result of chemical analysis after purification showed that the weight percentage of iron in powder dropped to 9% and 0.8% (depending on the solvents). Moreover, the sintering behavior of hot-pressed boron carbide powder with different percentages of iron as sintering aid has been studied. The results showed excellent densification and hardness of the sintered parts.

Structure formation in sintering iron-boron carbide powder composite

1991 ◽  
Vol 30 (6) ◽  
pp. 465-470
Author(s):  
Yu. V. Turov ◽  
B. M. Khusid ◽  
L. G. Voroshnin ◽  
B. B. Khina ◽  
I. L. Kozlovskii
Keyword(s):  
Boron Carbide ◽  
Structure Formation ◽  
Powder Composite ◽  
Carbide Powder

Hot Pressing of Boron Carbide Using Metallic Carbides as Additives

2009 ◽  
pp. 135-141
Author(s):  
S.L. Pedro Augusto de Cosentino ◽  
Célio A. Costa ◽  
José Brant de Campos ◽  
Roberto Ribeiro de Avillez
Keyword(s):  
Boron Carbide ◽  
Hot Pressing
Sign in / Sign up

Export Citation Format

Share Document