简介:本文以POE和POE-g-MAH并用,通过改变其比例来改变MAH含量以控制弹性体在PA6中的粒径分布。研究了POE弹性体粒径大小PA6/POE共混力学性能的影响。结果表明:弹性体分散相粒径的大小与分布是影响共混物韧性的主要因素,弹性体分散相粒径小于0.2μm时,对PA6增韧效果不佳。但弹性体粒径大小和分布并不影响共混物的屈服强度和模量。75%PA6/25%POE缺口冲击强度比PA6提高不到一倍;对于弹性体分散相粒径的大部分在0.2μm以下,最小的小于50nm的80%PA6/20%POE-g-MAH,其缺口冲击强度仅比PA6提高了三倍多;弹性体粒子在0.2~0.5μm间的80%PA6/13%POE/7%POE-g-MAH缺口冲击强度比PA6提高了近八倍。
简介:DenseSi3N4BNcompositeceramicswerefabricatedbysparkplasmasinteringat1500,1600and1650℃under50MPafor5minusingSi3N4andBNpowdersasstartingmaterialsand2mass%Al2O3and6mass%Y2O3assinteringadditives.ThevolumefractionofBNinSi3N4BNcompositepowderswaschosenas10%,20%,and30%,respectively.TheresultsofXRDandSEMshowthatα-Si3N4completelyturnsintoβ-Si3N4whenthecompositeceramicsaresinteredat1650℃;theadditionofBNhindersthegrowthofSi3N4grains,refiningthestructure;VickershardnessandfracturetoughnessofthecompositeceramicsdecreasewiththeincreaseofBNcontent.
简介:Micro-poredCA6-MAlightweightmaterialwithCA6:MAmassratioof7:3waspreparedusingAl(OH)3.MgCO3andCaCO3asstartingmaterials,andanthracite.sweetpotatostarchandanthracite+sweetpotatostarchasporeformingagent(PFA)withanadditionof10mass%.20mass%and30mass%.respectively.Thestartingmaterialsweredrymixed.wetco-milledinaballmillfor1h.slipcastintocylindricalspecimenswithadiameterof60mm.andthencalcinedat1450℃for3h.WiththeincreaseofPFAaddition.apparentporosityincreases,andbulkdensitydecreases.TheinfluenceofdifferentPFAsonpropertiesofthemicro-poredLWCA6-MAaggregatewasinvestigated.TheachievedCA6-MA.byadding30%sweetpotatostarch.hasaporosityof76.8%.bulkdensityof0.78g·cm-3andmedianporesizeof1.90μm.