Materials Literature
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The addition of tricalcium silicate (C3S) to apatite cements results in an increase of bioactivity and improvement in the mechanical properties. However, adding large amounts raises the local pH at early stages, which retards the precipitation of hydroxyapatite and produces a loss of mechanical strength. The introduct…
Chromatic variation, colour and luminosity, undergone by the ceramic support protected by the incorporation of a treatment with water repellent products, is analysed. A new methodology is suggested, based on RGB model where quantifiable values from each ceramic sample are obtained through digital measurement of the co…
In the present work, thermal and mechanical behaviors of phenolic resin are investigated. This polymer can be used as a matrix for carbon-carbon composites. To find out the best heating process, five different cycles are used for curing the polymer and flexural strength of the specimens are obtained. The cycle with ma…
The microstructural evolution and corresponding phase transformations have been investigated during partial remelting of AZ91D magnesium alloy refined by Al-Ti-B master alloy. The effect of heating temperature on semisolid microstructure has also been discussed. The results indicate that the microstructural evolution…
This paper reports research about the durability of non-woven geotextiles when exposed to artificial weathering conditions [ultraviolet (UV) radiation, rain and dew] on a laboratory weatherometer. The geotextiles were specially manufactured from polypropylene fibers stabilized with different amounts of the additive Ch…
Corrosion effects on reinforcement become evident in the bar section reduction and in the variation of mechanical properties related to ductility. In this research work, 96 B500SD steel bars, previously subjected to different corrosion variables, have been tested. Results show that the elongation of the bars diminishe…
This study examined the possibility of reusing the ceramic wastes of sanitary ware as coarse aggregate, in partial substitution (15, 20 y 25 %) of natural coarse aggregates. Firstly, the characterization of recycled coarse ceramic aggregate was carried out subsequently proceeded to establish the parameters of dosage a…
The objective of this work is to study the influence of the loading path on the lifetime of self-healing ceramic matrix composites. The loading can be of different types: mechanical, thermal or chemical. The self-healing process consists of filling some cracks with an oxide plug, thus limiting the diffusion of oxygen…
در این تحقیق، تف جوشی فراجامد در حضور فاز مایع پودر آلیاژ آلومینیم 2024 از نوع پیش آلیاژ بررسی شد. آزمون های تحلیل تغییرات حرارتی (DTA) و تعیین تغییرات حرارتی وزن(TGA) در دو محیط خلاء و نیتروژن انجام شدند. محیط نیتروژن به دلیل تشکیل نیترید آلومینیم، فرایند چگالش را بهبود داد. بیش ترین چگالی در دمای C 610 و درون محیط…
در این تحقیق، پدیدهی گرافیتزایی در فولاد هایپریوتکتویید تجاری نوع CK100 با ساختار اولیهی مارتنزیتی طی عملیات حرارتی بازپخت بررسی شده است. مشاهدات انجام شده به وسیلهی میکروسکپهای نوری و الکترونی روبشی نشان دادند که ذرات گرافیت به دلیل تجزیهی کاربیدهای حاصل از تابکاری ریزساختار مارتنزیتی، در زمینهی فریتی شکل گرف…
Polymer composite pipes are an appealing option as a substitute for conventional steel pipes, particularly due to their inherent corrosion resistance. However, the composite pipes currently used do not allow non-destructive evaluation (NDE) using instrumented devices which operate with magnetic sensors. The present wo…
There are evidences considering the effectiveness of Si on enhancing biological properties of calcium phosphates; however, there are not many works relating to the Si-alpha-TCP bone cement. The influence of silicon doping on the properties of Α-TCP cement was analyzed. Si-TCP was obtained by a solid state reaction emp…
The new Ca2CoTaO6 double perovskite has been synthesized by a conventional solid state reaction and its unit cell parameters determined by X-ray powder diffractometry. It crystallizes in the monoclinic space group P2(1)/n. The unit cell parameters are: a = 5.507(2) Å; b = 5.564(3) Å; c = 7.798(3) Å; β = 89.99(4)° and…
کربن دهی قطعات صنعتی از جنس فولاد کم کربن با هدف بهبود عمل کرد آن ها، کاری رایج به شمار می آید. کنترل دقیق درصد کربن سطح قطعات کربن دهی شده، مهم ترین عامل در رسیدن به خواص مورد نظر است. روش های متفاوتی برای تعیین درصد کربن سطح فولاد وجود دارند، امّا همه ی آن ها زمان بر و پرهزینه اند. افزون بر این، امکان آزمودن همه ی ن…
در این پژوهش، تأثیر زمان آس تمپرینگ بر ریزساختار، خواص کششی و مقاومت به ضربه ی فولاد فوق مستحکم کم آلیاژ AC6D بررسی شد. برای رسیدن به این هدف، ابتدا نمونه ها در دمای ºC 910 آستنیته شدند و پس از آن، عملیات حرارتی آس تمپرینگ در دمای ºC 330 به مدت زمان های 5/3، 5، 5/7، 10، 5/12، 15، 20 و 1440 دقیقه، و سرد کردن سریع بعدی…
هدف از انجام پژوهش حاضر، بررسی تأثیر هندسهی راهباره در مجموعههای راهگاهی فشاری در فرایند ریختهگری با قالب ماسهای است. عدم طراحی مناسب هندسهی راهباره میتواند منجر به وقوع پدیدهی ماسهشویی در فرایند ریختهگری شود. با این هدف، ابتدا مدلی بهشکل یک صفحهی نازک دو بعدی طراحی شد، و با تغییر شیب راهباره و سطح مقطع…
In this paper, bare spot defects in hot-dip galvanized sheets were studied in terms of the microstructure and their influence on the corrosion and mechanical properties. Surface characteristics and microstructural features were examined by scanning electron microscopy equipped with energy dispersive spectroscopy micro…
A computational simulation method is presented to assure life in composite systems by using dynamic buckling of smart composite shells as an example. The combined use of composite mechanics, finite element computer codes, and probabilistic analysis enable the effective assessment of the dynamic buckling load of smart…
Geometry and electronic structure of chiral carbon and carbon nitride (CNx) nanotubes were investigated through quantum chemical methods. Finite nanotubes with diameters ranging from 5 to 10 Å and containing up to 500 atoms were considered. CNx structures were built through random substitution of carbon atoms by nitro…