本文選題：磷酸鹽粘結(jié)劑　切入點(diǎn)：固化劑　出處：《蘭州理工大學(xué)》2011年碩士論文

【摘要】：以磷酸鹽作為粘結(jié)劑高溫粘結(jié)強(qiáng)度大,環(huán)境污染少,固化溫度低,受到各國(guó)科學(xué)工作者的極大重視。在磷酸基粘結(jié)劑中加入固化劑,制備了耐熱性能優(yōu)良的磷酸鹽粘結(jié)劑。然后,再加入固體潤(rùn)滑劑(MoS_2和石墨),研究了兩種固體潤(rùn)滑劑同時(shí)加入時(shí)的協(xié)同作用,尋找最優(yōu)配方,制備出了具有良好的耐高溫性能、潤(rùn)滑性能、耐磨損性能的涂層,并對(duì)其組織和摩擦性能進(jìn)行了研究。 本論文主要研究包括以下內(nèi)容: 1.本文以Al(OH)_3和H_3PO_4為原料,研究了磷酸鹽粘結(jié)劑的最佳合成條件,探討了P/Al配比和反應(yīng)溫度對(duì)Al(H_2PO_4)_3的形成的影響,利用XRD和TG-DSC對(duì)粘結(jié)劑晶體結(jié)構(gòu)和涂層熱性能進(jìn)行了分析。利用IR分析了合成粘結(jié)劑在不同溫度下P-O單鍵、P=O雙鍵和P-OH鍵等主要官能團(tuán)峰位的變化。研究表明:在P/Al比例為3:1.4,反應(yīng)溫度在120～200℃范圍內(nèi),粘結(jié)性能最佳。 2以MgO、ZnO、CuO為固化劑,探討了磷酸鹽粘結(jié)劑的固化性能。通過(guò)差示掃描量熱法(DSC)、熱重分析(TGA)、萬(wàn)能材料拉伸試驗(yàn)機(jī)和X射線衍射儀(XRD)等測(cè)試技術(shù),研究了磷酸鹽粘結(jié)劑的固化工藝、高溫?zé)岱�(wěn)定性、力學(xué)性能和晶體結(jié)構(gòu)影響。實(shí)驗(yàn)結(jié)果表明:MgO加入量5%時(shí),磷酸鹽粘結(jié)劑在167℃下固化,在500℃的剪切強(qiáng)度達(dá)到1.2MPa;ZnO加入量5%,磷酸鹽粘結(jié)劑在222℃下固化,在500℃的剪切強(qiáng)度達(dá)到3.1MPa;CuO加入量5%,磷酸鹽粘結(jié)劑在237℃下固化,在500℃的剪切強(qiáng)度達(dá)到1.6MPa。 3.以磷酸鹽為基料,以鋁粉、MoS_2和石墨為添加劑,制備了耐高溫潤(rùn)滑涂層。采用TG-DSC對(duì)涂層的耐熱性能的進(jìn)行分析,用高溫摩擦實(shí)驗(yàn)機(jī)對(duì)涂層的摩擦學(xué)性能進(jìn)行了分析。研究表明:鋁粉的加入有利于粘結(jié)劑表面吸附水的蒸發(fā)和磷酸鹽基體分子間結(jié)晶水的脫除,提高了涂層的耐高溫性能和附著力。涂層中分別加入石墨和MoS_2后,涂層的顯微硬度和摩擦?xí)r間均隨潤(rùn)滑劑含量的增加先增加后下降,摩擦系數(shù)則相反;當(dāng)潤(rùn)滑劑的質(zhì)量分?jǐn)?shù)分別達(dá)到20wt%和30wt%,涂層的耐磨性最佳。涂層的磨損機(jī)制主要是粘著磨損和疲勞磨損,潤(rùn)滑劑的加入,減少了粘著磨損。通過(guò)正交試驗(yàn)分析,石墨和MoS_2同時(shí)加入具有協(xié)同效應(yīng),使涂層的性能顯著提高。當(dāng)MoS_2為15wt%,石墨為5wt%,鋁粉為10wt%,ZnO為5wt%時(shí)所制備的涂層具有最佳的摩擦學(xué)性能,且摩擦學(xué)性能優(yōu)于單獨(dú)使用潤(rùn)滑劑的涂層
[Abstract]:Phosphate is used as binder for high temperature bond strength, less environmental pollution and low curing temperature, so it has been paid great attention by scientists all over the world.Phosphate binder with excellent heat resistance was prepared by adding hardener into phosphoric acid binder.Then, adding solid lubricant MoS _ 2 and graphite, the synergistic effect of two kinds of solid lubricant was studied when they were added at the same time, and the optimum formula was found, and the coatings with good high temperature resistance, lubricity and wear resistance were prepared.The microstructure and tribological properties were studied.The main contents of this thesis are as follows:1.In this paper, the optimum synthetic conditions of phosphate binder were studied by using Al(OH)_3 and H_3PO_4 as raw materials. The effects of the ratio of P/Al and reaction temperature on the formation of Al(H_2PO_4)_3 were discussed. The crystal structure of binder and thermal properties of coating were analyzed by XRD and TG-DSC.The changes of peak positions of main functional groups, such as P-O single bond, P-OH bond and so on, were analyzed by IR.The results show that when the ratio of P/Al is 3: 1.4 and the reaction temperature is 120 鈩，

本文編號(hào)：1702159