Sintering and characterization of SiC reinforced Ni powders in microwave furnace

In this study, SiC reinforced nickel matrix composites, microwave at different temperatures It is produced by sintering in oven. Nickel deposition on SiC powders was achieved by using electroless nickel plating technique. It is sintered at temperatures between 500°C, 600 °C, 700°C, 800°C and 900°C under Ar atmosphere. XRD, SEM (Scanning Electron Microscope), pressure test and hardness measurements were used to characterize the properties of sintered samples in microwave furnace. The experimental results, maximum compressive strength (σmax) and hardness (HV) were carried out at 800 °C. Microwave sintering of Ni-coated SiC powders without electric current can be a promising technique for producing ceramic-reinforced nickel composites.TUBITAK due to its contributions to this study with project no. 106T744

WC tabanlı sert malzemeler nasıl geliştirilir

Tungsten carbide is known to have excellent corrosion resistance and high hardness within carbide ceramics. Due to their superior mechanical properties and wear resistance, tungsten carbide cutting tools containing Co binder have been the subject of many studies. There are a limited number of works regarding the use of Ni and Fe as a binder in tungsten carbide based composites, especially processing with microwave radiation. In this study, a composite cutting tool made of electroless nickel coated tungsten carbide ceramic powder was produced by microwave sintering. Two different tungsten carbide powder sizes of 2 µm and 10 µm were used for the production of composite cutting tool. The microwave sintering was carried out at two different temperatures of 1200 and 1400 ° C for 2 hours. Characterization of composite cutting tools was made by XRD, hardness, compression test and electron microscopy techniques.Tungsten karbür seramikler içerisinde mükemmel korozyon direnci ve yüksek sertliğe sahip olduğu bilinmektedir. Üstün mekanik özellikleri ve aşınma direncinden dolayı, Co bağlayıcı içeren tungsten karbür kesici takımlar birçok çalışmaya konu olmuştur. Tungsten karbür esaslı kompozitlerde, özellikle mikrodalga radyasyonu ile işlem yapan, Ni ve Fe'nin bağlayıcı olarak kullanımıyla ilgili sınırlı sayıda çalışma vardır. Bu çalışmada, elektriksiz nikel kaplı tungsten karbür seramik tozundan yapılmış bir kompozit kesici alet mikrodalga sinterleme ile üretildi. Kompozit kesici alet üretiminde 2 farklı tungsten karbür toz büyüklüğü 2 µm ve 10 µm kullanıldı. Mikrodalga sinterleme, 2 saat boyunca iki farklı 1200 ve 1400 ° C sıcaklıkta gerçekleştirildi. Kompozit kesici aletlerin karakterizasyonu XRD, sertlik, sıkıştırma testi ve elektron mikroskobu teknikleri ile yapılmıştı

Investigation of mechanical properties of fe-doped intermetallic nial

Son yıllarda NiAl gibi intermetalik malzemeler, yüksek sıcaklık uygulamalarında iyi mekanik ve fiziksel özellikler göstermektedir. Özellikle yüksek erime noktası, iyi oksidasyon direnci ve yüksek sertlik bu intermetaliklerin en dikkat çeken özellikleri arasındadır. NiAl intermetalikler, Fe katkılı malzemenin yanında Ti, Cr, Co ve Mo gibi malzemelerin katkısıyla çeşitli uygulamalarda kullanım alanına sahiptir. Özellikle Fe katkılı intermetalikler, yoğunluk, yüksek dayanım ve iyi korozyon direnci gibi özellikler sergilemektedir. Bu çalışmada NiAl toz karışımı ile Fe tozu farklı sinterleme sıcaklığında sinterlenmiştir. Sinterlenen numunelere sırasıyla SEM ve EDX analizleri gerçekleştirilmiştir

Investigation of mechanical properties of boronized composites produced by electroless Ni coating

In this study, ceramic-metal composite production and characterization have been made in order to increase the service life of plotter tools used in soil industry. In the study Ni coated (36% AlN + 3% WC) powders were circularly shaped in uniaxial hydraulic press. These samples were sintered at 1000-1100-1200-1300-1400 °C with argon atmosphere in conventional furnaces. The highest hardness value of 112.9 Hv was obtained in the composite samples (36%AlN + 3%WC) at 1400 °C. Powder metallurgy was applied to ceramic-metal composites by using box boring in dry air atmosphere at 950 °C for 4 hours. The samples were characterized by mechanical and metallographic examination. After box boronization, hardness values were measured, their densities were calculated, the current phases were determined by X-ray diffraction (XRD) method and microstructures were examined by scanning electron microscopy (SEM). The highest hardness value of 1150.80 Hv was sintered at 1400 ° C and 61% Ni was obtained in the box boron composite sample (36% AlN + 3% WC). Better mechanical and metallographic results were obtained from the samples by using box boring method. The porosity decreased in the microstructure examination of the sample. Considering the advantages of non-electric Ni coating method in sintering, it can be said that improving mechanical properties is a good method. Boronizing process was effective in reducing surface porosity and increasing surface hardness up to 10 times

Production of Co-Cr-Ti composite and investigation of mechanical properties

Intermetallic materials such as Co2Ti, Cr2Ti are among advanced technology materials that have outstanding mechanical and physical properties for high temperature applications. Especially creep resistance, low density and high hardness properties stand out in such intermetallics. The microstructure, mechanical properties of %64Co– %32Cr and %4Ti powders were investigated using specimens produced by tube furnace sintering at 800–1200 C temperature. A composite consisting of ternary additions, a metallic phase, Ti, Cr and Co have been prepared under Ar shroud and then sintered in tube furnace. XRD, scanning electron microscope, were used to characterize the properties of the specimens. Experimental results carried out for composition %64Co–%32Cr–%4Ti at 1200 C suggest that the best properties as 182.09 HV and 5,584 g/cm3 density were obtained at 1200 C

Production of ni3al-fe composite and investigation of mechanical properties

In intermetallics high resistance to creep and oxidation, high strenght, low density are desired properties. Sintering process was used in this study by adding different amounts of Fe powder to Ni-Al powder mixture. When the properties of the sample after sintering were examined 40% weight Fe added composition was found as the most suitable ratio in terms of mechanical properties. Analyses were conducted metallographically on the samples after sintering, the densities were calculated, hardness and shear strengths were determined. According to the data 40% Fe added composition had 5,82 gr/cm3 of density, 92,8 HB hardness values and displayed 221 MPa shear strength

Production of ni3al-cr composite and investigation of mechanical properties

Nickel aluminide intermetallic compounds possess attractive properties that make them good candidates for high temperature structural applications. It is known that Ni3Al intermetallics are commonly used in various application fields with the addition of Cr, in particular as well as elements such as Ti, Co, Mo and Fe which are related to this group for improving properties thereof. Given this information, sintering process was used in this study by adding different amounts of Cr powder to Ni3Al powder mixture. When the properties of the sample after sintering were examined we were able to reveal the effects of Cr on Ni3Al and consider 3% Cr added compositions as the most suitable ratio in terms of mechanical properties. Analyses were conducted metallographically on the samples after sintering, the densities were calculated, hardness and shear strengths were determined. According to the data 3% Cr adde

Mechanical proporties of a composite produced from electroless ni plated cr and ti powders

Intermetallic materials such as NiTi, Ni3Cr2, CrTi are among advanced technology materials that have outstanding mechanical and physical properties for high temperature applications. Especially creep resistance, low density and high hardness properties stand out in such intermetallics. The microstructure, mechanical properties of %64Ni plated %32Cr and %4Ti powders were investigated using specimens produced by tube furnace sintering at 1000-1400°C temperature. A composite consisting of ternary additions, a metallic phase, NiTi and Ni3Ti have been prepared under Ar shroud and then tube furnace sintered. XRD, SEM (Scanning Electron Microscope), were investigated to characterize the properties of the specimens. Experimental results carried out for composition %64Ni plated %32Cr- %4Ti at 1300°C suggest that the best properties as 208HV and 6,87/cm3 density were obtained at 1400°

Production and characterization of Ti-10Cr-3,33Co-3,33egg shelter composite materials using by powder metallurgy

Titanium based intermetallic compounds are frequently used in the production of biomaterials. The behavior of titanium similar to bone mechanical properties causes the use of titanium as a biomaterial and preferred among the materials. It also makes its use attractive in industrial applications at high temperatures. TiCrCo intermetallics are known to be used together with Ti matrix materials to improve the properties of the group in addition to elements such as Cr, especially Ti, Co, Mo and Fe in various application areas. This information is used frequently in the sintering process. In this study, Ti-10Cr-3,33Co-3,33 egg shelter powders were prepared as a sample mixture. When the properties of the samples produced after sintering are examined, it shows the effects of Co on TiCr. 3.33% Co additive was used in the composition of the composition and mechanical properties were determined in the produced samples. By looking at metallographic analysis, structural features were tried to be determined. The density of the produced samples was calculated, hardness and shear strength were determined. According to the results of the analysis, 3.33% Co composition and 3.71 gr / cm3 density, and 285.5 HV hardness values at 1200 ° C were obtained.