DTA of Rare-Earth Fe-Based Matrix Composites for Diamond Tools

2012 ◽  
Vol 424-425 ◽  
pp. 876-880
Author(s):  
Qing Hua Zou
Keyword(s):  
Heat Capacity ◽  
Rare Earth ◽  
Iron Powder ◽  
Matrix Composite ◽  
Hot Pressing ◽  
Bending Strength ◽  
Package Insert ◽  
Physical Parameters ◽  
Package Inserts ◽  
Diamond Tools

Research focused mainly on Fe-based matrix composite (the wrapped diamond), used Fe powder to replace the expensive cobalt powder (Co-based matrix composite), and add the rare earth (RE) elements to reinforce the related physical properties of this Fe-based matrix composite for diamond tools. Conducted on the related matrix composite differential thermal analysis (DTA), in particular Fe-based matrix composite containing 35% iron powder (with RE or without RE) Were discussed for DTA and the package insert forces. DTA and the analysis is consistent with the empirical formula. By hot pressing the composite with diamond as the research object, having researched the relationship among the heat capacity (CP) at constant pressure and other related physical parameters （the package inserts force and E etc.）. Take 35%Fe-based powder composite materials for diamond tools (with RE or without RE) as the research objiect, combining analysis of the problem for the porosity, and the densification, and the package inserts force, and the DTA tests, which the addition manner of rare earth, add form , and quantity are determined, so that the changes laws of DTA curve and heat capacity (CP) of Fe-based composite containing 35% iron powder( with the RE) are similar to the that of pure Co composites. Apply these laws to improve the hot pressing technology and mechanical properties of the diamond tools (bending strength, impact toughness, hardness and porosity) and so on

Diamond Tools Matrix Composites of Co Replaced by Fe with Doping Rare Earth

2012 ◽  
Vol 424-425 ◽  
pp. 848-851 ◽  
Author(s):  
Qing Hua Zou
Keyword(s):  
Rare Earth ◽  
Bending Strength ◽  
Service Performance ◽  
Rare Earth Doping ◽  
Matrix Composites ◽  
Metal Powders ◽  
Diamond Tools ◽  
Process Route ◽  
The Impact ◽  
Impact Ductility

The experiment on adding rare earth elements doped in diamond matrix composites is made. Based on the doping of rare earth in metal powders including tungsten carbide, iron and nickel, Co is entirely replaced by Fe with rare earth in diamond matrix composites, and the process route of rare earth doping is indicated. The related performance of is measured, and the results obtained show that the bending strength, the hardness and the impact ductility of Fe matrix composites with rare earth are improved. The practical service performance of Fe matrix composites with rare earth has reached up to the practical service performance of Co matrix, and bearing good practical service performance, low price, have made corresponding diamond tools.

Ball-milled Fe-Ni and Fe-Mn Matrix Powders For Sintered Diamond Tools

2014 ◽  
Vol 59 (1) ◽  
pp. 189-193 ◽  
Author(s):  
A. Romanski ◽  
J. Konstanty
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Bending Strength ◽  
High Hardness ◽  
Free Condition ◽  
Iron Base ◽  
Diamond Tools ◽  
Sintered Diamond

Abstract The work presents the possibility of substitution of expensive, Co-WC powders, that have been traditionally used in the production of sintered diamond tools, with cheap iron-base counterparts manufactured by ball milling. It has been shown that ball-milled Fe-Ni and Fe-Mn powders can be consolidated to a virtually pore-free condition by hot pressing at 900°C. The as-consolidated materials are characterised by high hardness, bending strength and resistance to 3-body abrasion.

Comparison of Bending Strength for Metal-Diamond Composites of Two Bond Matrices

2006 ◽  
Vol 532-533 ◽  
pp. 285-288
Author(s):  
Yi Qing Yu ◽  
Xiao Rui Tie ◽  
Xi Peng Xu
Keyword(s):  
Rare Earth ◽  
Failure Mechanism ◽  
Hot Pressing ◽  
Bending Strength ◽  
Rupture Strength ◽  
Metal Coatings ◽  
Transverse Rupture Strength ◽  
Diamond Crystals ◽  
Coated Diamonds

The present study was undertaken to examine the effects of metal coatings on the surfaces of diamond crystals embedded in two kinds of bond matrix. Diamonds with or without coatings were incorporated into two matrices for hot-pressing, thereby forming four kinds of diamond composites. The transverse rupture strength (TRS) of the composites was measured to assess the bending strength of the composites. SEM and EDS were used to analyze the fractured surfaces of the composites. It was found that the TRS of the composites containing coated diamonds increased in both bond matrices. But the coatings in the bond matrix without rare earth increased TRS a little more than the case with rare earth due to a different failure mechanism of metal coatings.

Heat-capacity measurements on rare-earth double oxides R2M2O7

Physica ◽  
1969 ◽  
Vol 43 (4) ◽  
pp. 549-568 ◽  
Author(s):  
H.W.J. Blöte ◽  
R.F. Wielinga ◽  
W.J. Huiskamp
Keyword(s):  
Heat Capacity ◽  
Rare Earth ◽  
Heat Capacity Measurements

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 Analysis of package inserts of orally administered drugs available in the Indian market

2017 ◽  
Vol 5 (2) ◽  
pp. 529
Author(s):  
Maheshi U. Chhaya
Keyword(s):  
Shelf Life ◽  
Package Insert ◽  
Complete Information ◽  
Indian Market ◽  
Package Inserts ◽  
Source Of Information

Background: The package insert of a medication forms an important source of information to the patient while taking a drug. The package insert is expected to contain complete information regarding the drug aiding the patient to obtain additional knowledge regarding the drug.Methods: 100 package inserts of orally administered drugs were obtained from local chemists and were analysed according to the Sections 6.2 and 6.3 of Schedule D (II), Drugs and Cosmetics Act (1940) and Rules (1945).Results: The posology and contraindications were mentioned in 98% and 96% of the inserts, respectively, whereas the list of excipients, incompatibilities and shelf life was mentioned in 12%, 19%, 16% of the inserts, respectively.Conclusions: There is a wide variation in the information available on the package inserts of drugs available in the Indian market. The package inserts should be carefully scrutinized for completeness before the respective drug is marketed.

scholarly journals Ontological Organization and Bioinformatic Analysis of Adverse Drug Reactions From Package Inserts: Development and Usability Study

10.2196/20443 ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. e20443
Author(s):  
Xiaoying Li ◽  
Xin Lin ◽  
Huiling Ren ◽  
Jinjing Guo
Keyword(s):  
Language Processing ◽  
Adverse Reactions ◽  
Package Insert ◽  
Bioinformatic Analysis ◽  
Two Dimensions ◽  
Semantic Relations ◽  
Semantic Retrieval ◽  
Formal Representation ◽  
Package Inserts ◽  
Drug Databases

Background Licensed drugs may cause unexpected adverse reactions in patients, resulting in morbidity, risk of mortality, therapy disruptions, and prolonged hospital stays. Officially approved drug package inserts list the adverse reactions identified from randomized controlled clinical trials with high evidence levels and worldwide postmarketing surveillance. Formal representation of the adverse drug reaction (ADR) enclosed in semistructured package inserts will enable deep recognition of side effects and rational drug use, substantially reduce morbidity, and decrease societal costs. Objective This paper aims to present an ontological organization of traceable ADR information extracted from licensed package inserts. In addition, it will provide machine-understandable knowledge for bioinformatics analysis, semantic retrieval, and intelligent clinical applications. Methods Based on the essential content of package inserts, a generic ADR ontology model is proposed from two dimensions (and nine subdimensions), covering the ADR information and medication instructions. This is followed by a customized natural language processing method programmed with Python to retrieve the relevant information enclosed in package inserts. After the biocuration and identification of retrieved data from the package insert, an ADR ontology is automatically built for further bioinformatic analysis. Results We collected 165 package inserts of quinolone drugs from the National Medical Products Administration and other drug databases in China, and built a specialized ADR ontology containing 2879 classes and 15,711 semantic relations. For each quinolone drug, the reported ADR information and medication instructions have been logically represented and formally organized in an ADR ontology. To demonstrate its usage, the source data were further bioinformatically analyzed. For example, the number of drug-ADR triples and major ADRs associated with each active ingredient were recorded. The 10 ADRs most frequently observed among quinolones were identified and categorized based on the 18 categories defined in the proposal. The occurrence frequency, severity, and ADR mitigation method explicitly stated in package inserts were also analyzed, as well as the top 5 specific populations with contraindications for quinolone drugs. Conclusions Ontological representation and organization using officially approved information from drug package inserts enables the identification and bioinformatic analysis of adverse reactions caused by a specific drug with regard to predefined ADR ontology classes and semantic relations. The resulting ontology-based ADR knowledge source classifies drug-specific adverse reactions, and supports a better understanding of ADRs and safer prescription of medications.

ChemInform Abstract: Hot Pressing of Silicon Nitride with Mixed Rare-Earth Oxide Additives

ChemInform ◽  
1988 ◽  
Vol 19 (33) ◽  
Author(s):  
E. RAPOPORT ◽  
C. BRODHAG ◽  
F. THEVENOT
Keyword(s):  
Rare Earth ◽  
Silicon Nitride ◽  
Hot Pressing ◽  
Rare Earth Oxide
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