scholarly journals A Review of the Diamond Retention Capacity of Metal Bond Matrices

Metals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 307 ◽  
Author(s):  
Xiaojun Zhao ◽  
Longchen Duan
Keyword(s):  
Retention Capacity ◽  
Metal Bond ◽  
Diamond Retention

The Effects of Coatings at Diamonds on the Mechanical Behavior of Metal-Diamond Composites

2007 ◽  
Vol 345-346 ◽  
pp. 1253-1256
Author(s):  
Yi Qing Yu ◽  
Yuan Li ◽  
Xi Peng Xu
Keyword(s):  
Mechanical Behavior ◽  
Rupture Strength ◽  
Metal Coatings ◽  
Transverse Rupture Strength ◽  
Metal Bond ◽  
Matrix Properties ◽  
Circular Sawing ◽  
Diamond Retention

The present study was undertaken to examine the effects of metal coatings at the surfaces of diamonds impregnated in metal bond matrices. Diamonds with or without coatings were incorporated into same bond matrix to form two metal-diamond composites in order to reveal the effects of coatings. Diamonds with same coatings were applied to three bond matrices to check the influences of matrix properties on the effects of coatings. The transverse rupture strength (TRS) of the composites was measured to ssess their mechanical behavior. Circular sawing was also conducted to reveal the contribution of coatings to diamond retention. SEM was used to analyze the fractured surfaces of the composites. For same bond matrix, the coatings at diamonds were found to increase the TRS of the composites. However, it is difficult to compare the effects of coatings in different bond systems.

scholarly journals Investigation of Filling Phase Percentages on the Performance of WC-Cu Based Hot-Pressing Diamond Bit Matrices

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1305
Author(s):  
Songcheng Tan ◽  
Changping Li ◽  
Xiaohong Fang ◽  
Hengchao Shi ◽  
Longchen Duan ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Oil And Gas ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Wear Test ◽  
Oil And Gas Industry ◽  
Mechanical Tests ◽  
Retention Capacity ◽  
Diamond Retention ◽  
Diamond Bit

WC-Cu based hot-pressing diamond bit has been widely applied in all-hydraulic geological exploration, as well as deep and ultra-deep well drilling in the oil and gas industry. However, the effect laws and mechanisms of Cu and WC on the metal matrix composite need further study. Therefore, six WC-Cu based metal matrices were designed, and a series of samples with different dimensions were fabricated to conduct some specific physical and mechanical tests, namely, tests of relative density, Rockwell hardness, bending strength, impact toughness and abrasion weight loss. Additionally, the microstructure and diamond retention conditions of the WC-Cu based samples after bending strength test, as well as their wear morphologies after the pin-on-disc wear test, were analyzed by scanning electron microscope. Test results indicate that most of the physical and mechanical properties were improved with the increase of 663-Cu at first, and then monotonously declined. The increase of 663-Cu also shows an important influence on the samples’ microstructure, diamond retention capacity and wear mechanism.

scholarly journals Mechanical Properties of Some Metallic Powder Alloys and Their Contribution to the Performance of Diamond Tools Used for Cutting Granite

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1219 ◽  
Author(s):  
Luís Guerra Rosa ◽  
Carlos A. Anjinho ◽  
Pedro M. Amaral ◽  
Jorge Cruz Fernandes
Keyword(s):  
Mechanical Properties ◽  
Rupture Strength ◽  
Brand Names ◽  
Evaluation Methodology ◽  
Unit Weight ◽  
Alloyed Powder ◽  
Technological Parameters ◽  
Retention Capacity ◽  
Diamond Tools ◽  
Diamond Retention

This work examined some pre-alloyed cobalt-, iron-, and copper-based powder binder systems—such as those launched commercially under the brand names of Cobalite and Next—in terms of their as-sintered physical-mechanical properties, namely, apparent density, Young´s modulus, yield strength, rupture strength, rupture strain, toughness modulus, and Vickers hardness. These types of sintered products are traditionally used in the fabrication of diamond impregnated tools for cutting granite stones. The following powder binder systems were evaluated: Cobalite HDR pre-alloyed powder, Next 300 pre-alloyed powder, and four other mixtures of these with Cu and Fe powders: Cobalite HDR + 20 wt% Cu; Cobalite HDR + 20 wt% Fe; Next 300 + 20 wt% Cu; Next 300 + 20 wt% Fe. The evaluation methodology aimed to establish criteria for developing new diamond tools and, therefore, it included the measurement of several technological parameters directly related to the cutting performance of the tools (e.g., energy consumption measurements made exclusively in the tool drive motor, forces generated in the tool, tool consumption per unit weight of stone removed by the cutting). The results show the adequacy of the methodology for the optimisation of diamond retention capacity of these types of metal matrices and for improving the working performance of the diamond tools.

Evaluation of Resistant Starch Quality from Different Types of Banana in Batter Coating Formulation to Reduce Oil Absorption in Fried Food

2019 ◽  
Vol 2 (2) ◽  
pp. 115-120
Author(s):  
Karissha Fritzi Della ◽  
Mutiara Pratiwi ◽  
Purwa Tri Cahyana ◽  
Maria DPT Gunawan-Puteri
Keyword(s):  
Resistant Starch ◽  
Extraction Process ◽  
Fat Content ◽  
Water Retention Capacity ◽  
Oil Absorption ◽  
Retention Capacity ◽  
Fried Food ◽  
Musa Paradisiaca ◽  
Different Types ◽  
Coating Formulation

Fried food is convenient for many people due to its pleasant texture and taste. On the other hand, it comes with the risk of high oil absorption which might lead to certain health problems. Resistant starch (RS) has been known to have a functionality of reducing oil absorption. Three different types of banana: Kepok (Musa paradisiaca formatypica), Raja Bulu (Musa paradisiaca L.) and Ambon (Musa paradisiaca L. var sapientum) were evaluated on its performance when utilized as source of resistant starch especially on their application in reducing oil absorption in fried food. Tempeh was used as the food model. Banana starch (RS2) was isolated through water alkaline extraction process, continued with modification process through three repeated cycles of autoclaving-cooling process to obtain the RS3. RS3 was added into the batter coating formulation at three substitution ratios (10%, 30% and 50%) and then used to coat tempeh before frying. Evaluation of resistant starch in batter and battered productwas conducted on the following parameters: fat content, water retention capacity (WRC), coating pick up and sensory analysis. The result of this study revealed that Raja Bulu showed the most effective result on reducing oil absorption in the food tested. In the three bananas used, the ratio of 50% performed best in coating pick up (highest), WRC (highest) and fat content(lowest) parameters, but not significantly different with the 30% ratio. In terms of sensory acceptance, using Raja Bulu as the selected banana type, 30% of substitution ratio was significantly more preferable by the panelists in crispness, oiliness, and overall acceptance attributes compared to control and other substitution ratios.

The use of high-resolution methods of research in the design of the diamond-matrix interface to increase the durability of the diamond tool

2020 ◽  
Vol 86 (6) ◽  
pp. 62-71
Author(s):  
P. P. Sharin ◽  
S. P. Yakovleva ◽  
M. P. Akimova ◽  
V. I. Popov
Keyword(s):  
High Resolution ◽  
Diamond Tool ◽  
Diamond Surface ◽  
Matrix Interface ◽  
Reaction Products ◽  
Diamond Tools ◽  
Functional Composites ◽  
Mechanical Adhesion ◽  
Carbide Matrix ◽  
Diamond Retention

The results of studying fundamental and applied problems regarding the formation of boundary layers between diamond and carbide matrix are presented with the goal to develop a highly resistant diamond tool. The new approaches to the synthesis of diamond-carbide materials combining diamond metallization and sintering in a single-stage technology are presented. The developed technology eliminates the re-heating of a metallized coatings which results in their destruction and enhanced graphitization of diamond (these phenomena restrict using metallization procedure to improve diamond retention and synthesis of high-functional composites for diamond tools). The goal of the study is analysis the structural and phase state of the «diamond – carbide matrix» interface in a diamond tool obtained by the new technology and the main factors determining the level of diamond retention in the presence of a metallized coating. Unique opportunities provided by modern high-resolution methods of research were used in the study. The elemental composition and morphological features of the diamond-matrix interface were studied using the methods of scanning electron microscopy, atomic force microscopy, X-ray microanalysis and Raman spectroscopy. Identification of the reaction products, including non-diamond carbon was performed. It is shown that the introduction of the powder-metallizer significantly modified the contact boundaries and provide conditions for improving the chemical and mechanical adhesion of the diamond-matrix system. The formation of the well-developed nano- and sub-microscale roughness of the diamond surface and dense filling of the existing voids with nanoscale layers of metal-infiltrate was revealed. The multilevel organization of highly structured elements of the transition zone with the minimal graphitization ensured the monolithic character and strength of the diamond-matrix bond. Comparative service tests of preproduction and control samples of diamond dressers proved the efficiency of developed hybrid technology (the specific performance of diamond tools increased by 39 – 45%). New fundamental and applied results have been obtained in the field of studying interface zones in crystalline multiphase systems that can be used to regulate adhesion phenomena at the interphase boundaries and develop highly efficient composite materials.

Cr(VI) RETENTION CAPACITY AND SELECTIVITY OF SOME STRONG AND WEAK BASE ANION EXCHANGERS

2004 ◽  
Vol 3 (3) ◽  
pp. 221-230 ◽  
Author(s):  
Ion Untea ◽  
Cristina Orbeci ◽  
Elena Tudorache ◽  
Violeta Neagu
Keyword(s):  
Weak Base ◽  
Anion Exchangers ◽  
Retention Capacity
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