Synthesis And Research Of Infrared Radiation Composite Materials

Infrared radiation material (IRM) is a functional material being widely used inindustries such as antiheat coatings, healthcare products, and infrared heating.Researching and developing IRM are highly beneficial to energy consumptionreduction, enviorment protection and medical care. Among various IRMs, cordierite isbeing intensively studied due to its low price, high initial infrared radiation property,and loose crystal structure. To achieve higher infrared radiation property, dopping isthe major method during the past decades. However, only several kinds of elementscan partially replace Mg2+, Al3+in the crystal structure of cordierite, and the radiationproperty of these products is limited. Consequently, other methods must beinvestigated and applied, which are rarely reported.In this study, in order to obtain IRM with higher infrared radiation property, threekinds of methods were applied and three corresponding series of IRMs were obtained.Firstly, using magnesium, aluminium nitrate, tetraethyl orthosilicate (TEOS) as startingmaterials, Zn2+dopped cordierite gel was formed, and after calcination,Gahnite-Cordierite composite powder was obtained. Secondly, by alkali processing thecommercial cordierite powder, Zeolite-Cordierite composite material was obtained.Thirdly, using Zr4+and Y3+solution as starting material, either urea or ammonia asprecipitator, t-ZrO2precursor coated cordierite composite material was formed, andafter calcination, t-ZrO2-Cordieite composite was obtained. In these three experiments,X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetricanalyzer (TGA), differential scanning calorimetry (DSC) and fourier transforminfrared spectra (FT-IR) characterizing techniques were appled to reveal themechanism of the formation of each product. IR-2infrared radiation tester was appliedto test the infrared radiation property of each product, and some of the results are asfollows. Gahnite-Cordierite composite powder possesses a higher infrared radiationproperty in1~22μm waveband than pure cordierite, especially in3~5μm waveband.Zeolite-Cordierite composite has a remarkable infrared radiation property in1~22μmwaveband， much higher than unprocessed cordierite powder. t-ZrO2-Cordieitecomposite achieved an elevated infrared radiation property in3~5μm waveband, however, in1~22μm waveband, the value remains similar to cordierite powder.In conclusion, this work not only brings some useful information for the IRMsresearch, but also gives some suggestions to the infrared radiation powders in industry.