نتایج جستجو برای: پودر wc
تعداد نتایج: 11966 فیلتر نتایج به سال:
Metal Matrix Composite (MMC) coatings of Tungsten Carbide (WC) and Nickel (Ni) powder were produced using laser cladding process. A crack free good metallurgically bonded WC-Ni coating about 5mm thick from varying both energy density percent mixture Ni WC. In this study, the microstructure characterised optical microscope (OM), scanning electron (SEM) with EDS, while mechanical properties studi...
هدف از این تحقیق تولید کامپوزیت wc-co با ترکیب مختلف از 13 الی 33% کبالت از اکسیدهای فلزی wo3 و co3o4 به روش درجا و با استفاده از عملیات احیای کربوترمیک و سپس بررسی خواص فیزیکی و مکانیکی آن می-باشد. در این مطالعه پودر اکسیدهای فلزی کبالت و تنگستن به نسبت های مختلف به همراه 17 درصد وزنی کربن (30 درصد اضافه بر مقدار استوکیومتری)، بعد از فعال سازی مکانیکی در یک آسیای گلوله ای ماهواره ای با گاز محا...
A ccumulating evidence suggests that measures of abdominal obesity outperform BMI in predicting diabetes and cardiovascular risk (1–3). However, it is debated which measure of obesity should be used. Currently, waist circumference (WC) is most commonly used and codefines the metabolic syndrome (4). Unlike waist-to-height ratio (WHtR), WC does not take differences in height into account. We hypo...
در این تحقیق ریز ساختار و خواص مکانیکی جوشهای اصطکاکی ti6al4v/(wc-co) مورد بررسی قرار گرفته است. ریزساختار منطقه مجاور جوش در نمونه تیتانیمی در کلیه حالتها متشکل از فریت سوزنی و هم محور همراه با فاز بتا بوده و در کلیه نمونه ها مخلوط شدن مکانیکی و نفوذ متقابل عناصر در یکدیگر رخ داده است. استحکام شکست جوشهای اصطکاکی ti6al4v/(wc-co) با افزایش درصد کبالت موجود در زمینه کاربید تنگستن- کبالت به طور ب...
The fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure. In doing so, the influence of binder chemical nature and content (Co and 76wt%Co-24wt%Ni), as well as carbide grain size on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated. Mechanical testing is combined with a d...
Drill bits equipped with WC-Co cemented carbide buttons offer great performance in many rock drilling applications. Generally, the wear of these against is gradual and moderate, or even slow depending on conditions. However, Co binder has recently been found to cause health issues an alternative binder, which does not compromise carbide, needed. In present work, WC-Fe WC-Ni investigated compare...
BACKGROUND Obesity has been identified as an important risk factor in the development of cardiovascular diseases; however, other factors, combined or not with obesity, can influence cardiovascular risk and should be considered in cardiovascular risk stratification in pediatrics. OBJECTIVE To analyze the association between anthropometry measures and cardiovascular risk factors, to investigate...
OBJECTIVE To evaluate the reliability of anthropometric measurements (weight, height, Body Mass Index (BMI), waist and hip circumferences (WC; HC) and waist-to-hip ratio (WHR)) performed by doctors to assess obesity. METHOD Repeated anthropometric measurements were performed by 12 primary care physicians on 24 adult volunteers in Geneva, Switzerland, 2006. Volunteers (54% women, mean age 41) ...
OBJECTIVES To explore associations of BMI and waist circumference (WC) with disability among the Chinese oldest old. METHODS The 5,495 oldest old in the sixth wave of Chinese Longitudinal Healthy Longevity Study conducted in 2011 were included in this study. Disability was assessed by activities of daily living (ADL); height and weight for BMI and WC were measured; information including socio...
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