Tungsten Electrodes Price

Cobalt Interlayed TiN-coated Tungsten Carbide Cutting Tool’s Performance Ⅱ

Details: Category: Tungsten Information; Published on Thursday, 10 September 2015 09:25; Written by zhihua; Hits: 288

1.Introduction

Hard coatings such as TiN, TiCN, TiAlN, etc. have been applied industrially under wide circumstance for improving mechanical properties and lifetime of tools, dies, and mechanical parts. One of the most important parameters of such hard coatings is the adhesion between coating layer and substrate , because various kinds of loads including cyclic, mechanical, and thermal loads are considerably applied to the coated wares in actual use. In order to improve adhesion, various methods such as pre-treatment s of substrate, adoption of interlayer, multi- layers or functionally graded layers were studied. As a suitable method for improvement of the adhesion between steel substrate s and Ti-based coatings, Ti interlayers have been shown to lead to substantial increase in the adhesion strength . The origin of improved adhesion has reported that Ti interlayer is to have a strong affinity to oxide layers remaining on the surface of the substrate as well as to relieve shear stresses in the interface. Although interlayers of Ti, Ta, W, Mo, and Si were developed and reported in senses of materials engineering , their cutting performance was scarcely reported. In relation to Co interlayer and post-annealing, their impact on the cutting performance for end-mill coated tool has not been verified for the reliability of tool wear distribution. The most common distributions for analyzing the reliability of mechanical systems are the exponential, log-normal, and Weibull distributions.

In this study, the adhesion behavior of the adhesion behavior of TiN coatings on cutting tools of WC-Co by hybrid coating method was studied with Co interlayer and post- annealings on cutting tools of WC-Co by hybrid coating method was studied with Co interlayer and post- annealing. The adhesion strength, failure behavior, and Co diffusion from substrate were comparatively investigated related to interlayer thickness and heat treatment. Cutting tests against AISI D2 cold- worked die steel and their reliability tests were studied. To verify the goodness of fit for tool wear distribution, normal distribution and log-normal distribution by chi-squared test were considered.

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Atomic Layer Deposition of Tungsten Using Sequential Surface Chemistry with A Sacrificial Stripping Reaction

Details: Category: Tungsten Information; Published on Wednesday, 09 September 2015 17:55; Written by xinyi; Hits: 298

Tungsten (W) films were grown with atomic layer control using a novel sequence of self-limiting surface reactions. The tungsten film growth was achieved by dividing the binary reaction WF₆+Si₂H₆→W+2SiHF₃+2H₂ into two separate half-reactions. Alternating exposures to WF6 and Si2H6 in an ABAB… sequence produced tungsten deposition at temperatures between 425 and 600 K. The Si₂H₆ reactant served only a sacrificial role to strip fluorine from tungsten without incorporating into the film. FTIR spectroscopic investigations demonstrated that the WF₆ and Si2H6 half-reactions were complete and self-limiting at T>400 K. In situ spectroscopic ellipsometry measurements determined a tungsten growth rate of 2.5 Å/AB cycle with WF6 and Si2H6 reactant exposures sufficient for complete half-reactions. The surface topography of the deposited tungsten films was flat indicating smooth film growth. The tungsten films were either amorphous or composed of very small crystalline grains and contained no measurable silicon or fluorine. These results represent the first demonstration of atomic layer deposition of smooth single-element metal films using sequential surface chemistry.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten Carbide Ball Grades

Details: Category: Tungsten Information; Published on Wednesday, 09 September 2015 17:48; Written by xiaobin; Hits: 305

Some main tungsten carbide ball grades table

Grades	WC contents（%）	Co contents（%）	Hardness（HRA）	Density（g/cm³）	TRS （N/cm²）
YG6	94	6	89.5	14.5-14.9	1380
YG6X	94	6	91	14.6-15.0	1500
YG8	92	8	89.5	14.5-14.9	1600
YG10	90	10	89.5	14.3-14.7	2200
YG15	85	15	87	13.9-14.2	2100

The table shows that the hardness will decrease by the increasing Co content, while its toughness and bending strength is enhancing. In addition, fine grain has higher density and hardness than coarse grain and other properties are also improving after sintering.

图片锚文本

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.c
n

Tungsten Carbide Ball Process

Details: Category: Tungsten Information; Published on Wednesday, 09 September 2015 17:50; Written by xiaobin; Hits: 294

Tungsten carbide ball has high hardness and usually above 87 HRA, which is double than normal steel ball so that the process is also difficult. The main problem is that the low surface energy of tungsten carbide ball, grinding media and abrasive adhesion is poor. Therefore, it has a huge influence on the efficiency and the accuracy or the surface roughness of tungsten carbide ball. Secondly, the rotation of tungsten carbide ball in the grinding plate is poor, which affects the machining accuracy carbide ball to some extent, especially spherical error.

At present, the most of equipments are based on steel ball process, which needs us to improve the equipment and grinding structure, choose proper grinding compounds and grinding plate for optimizing the parameters. In addition, high precision tungsten carbide ball milling mode includes that four-axis ball milling, V-groove grinding, conical grinding, spin rotation control, magnetic grinding and two-way rotation grinding.
图片锚文本

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Determination of Arsenic,Copper,Manganese,Molybdenum,Phosphorus and Silicon in Ferrotungsten

Details: Category: Tungsten Information; Published on Wednesday, 09 September 2015 17:47; Written by xinyi; Hits: 271

Determination of arsenic,copper,manganese,molybdenum,phosphorus and silicon in ferrotungsten by inductively coupled plasma atomic emission spectrometry.

A simultaneous determination method of arsenic,copper,manganese,molybdenum,phosphorus and silicon in ferrotungsten by inductively coupled plasma-atomic emission spectrometry was established.The samples were dissolved with oxalic acid and hydrogen peroxide.The matrix elements(W and Fe) and other coexisting elements had no interference with the testing elements.Under the optimal conditions,the detection limits of arsenic,copper,manganese,molybdenum,phosphorus and silicon were 0.009,0.006,0.000 1,0.000 3,0.005 and 0.002 μg/mL,respectively.The standard addition recoveries were 95 %-108 %,and the relative standard deviation(RSD,n=3) was 0.1 %-3.3 %.The proposed method has been applied to the determination of certified reference material,the results were in good agreement with the certified values.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn