Conductive elastomeric nanocomposites (CEMs) were prepared in two stages to control the precision of pressure sensors. Carbon-based nanofillers such as multi-walled carbon nanotubes (MWCNT) or graphene (GR) were added to the rubber matrix. For Rubber/MWCNT composites, unfunctionalized (U-MWCNT) and –COOH functionalized MWCNT (F-MWCNT) fillers were synthesized. The properties of the CEMs and the synergistic improvements between the fillers and rubber matrix in composites were also investigated. SEM images show that F-MWCNT fillers were dispersed homogeneously in the composites and they interacted with rubber better than other carbon fillers. The piezoresistivity properties of the CEMs before and after compression were determined using the four-probe method by cyclic loading in 1 mm increments between 1.5 mm and 3.5 mm. F-MWCNT filled composites had higher strength than others when they were compressed by 2.5 mm. The F-MWCNT and GR filled nanocomposites possessed the best resistivity for pressure sensors when compressed at 2.5 mm (for F-MWCNT 1.1E + 08 Ω, GR 5.28E + 06 Ω). These nanocomposites are promising pressures sensors for air suspension systems.
Although material science is advanced at present time, new technological developments require new generation and different materials that are commercially not available in global market. In order to make long distance space journeys possible in near future, innovation of multipurpose and reusable ceramic composite materials for at high temperature environments are needed. Ceramics that are useable at elevated temperatures as high as 2300˚C are called Ultra high temperature ceramics (UHTC). In this study, the processing of UHTCs based on ZrC/ZrB2/SiC/Al2O3 ceramic composite that has high melting point, chemical and thermal stability, at the laboratory conditions was investigated using zircon, boric acid, carbon and aluminium powders. Aluminothermic method was chosen, the starting mixtures and the obtained reaction products were analysed using SEM, XRD, XRF and TG/DTA analysis methods. The experimental results showed that, the obtained sample consists of ZrB2/ZrC as a matrix phases.
Grafen(GrF) katkılı elastomer esaslı basınç sensörleri (PgS) iki aşamada elde edilmiştir. Bu malzemeler SEM cihazında analiz edilerek dolgu malzemelerinin dağılımı ile direnç arasındaki etkileşimi incelenmiştir. PgS’lere, farklı deplasman değerleri için çevrimli yüklemeler uygulanarak, numunelerin iç yapısına bağlı direnç değerlerinde oluşan değişiklikler gözlemlendi. Matris içindeki iletken dolgu malzemesinin yüzey alanı, mekanik özellikleri ve dağılım şekli PgS’lerin iletkenliğini belirlemektedir. Basınç-Direnç ilişkisine bağlı olarak dirençteki azalma ve iletkenlikteki artış, 3 mm sıkıştırmada daha yüksektir. GrF katkılı PgS’lerin direnç değişimi yükün bir fonksiyonu olarak değişkenlik göstermektedir.. Uygulanan kuvvet artışı ile bir miktar direnç artsa da, yükün dolgu malzemesine aktarılması sonucu direnç düşme eğilimindedir. PgS’lere, 1mm, 2mm ve 3mm’lik deplasmanlarda çevrimli yükleme-boşaltma testleri yapılmış, sırasıyla 85 N, 273 N ve 805 N sıkıştırma kuvvetleri elde edilmiştir. En yüksek direnç değeri 3 mm sıkıştırma sonucunda 5,29Ex06 Ω olarak tespit edilmiştir. Çalışmamızda PgS’nin bu eşsiz özelliğinden yararlanarak hava süspansiyon körüklerinin ikincil süspansiyon elemanı olan sönümleme takozu üzerine uygulaması ile yaptığımız testlerde, körüğün çalışma şartları ile ilgili tahminler yapılmıştır.
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