本文關(guān)鍵詞： 消失模鑄造 鋁合金 硅酸鎂鋁 黃原膠 流變性　出處：《中北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：消失模鑄造是鋁合金及鎂合金鑄造成型的一種重要方式,其中,鑄造涂料對(duì)鑄件質(zhì)量起著至關(guān)重要的作用,特別是它能夠很好地提高鑄件表面光潔度和尺寸精度,降低鑄件產(chǎn)生針孔、冷隔、粘砂、砂眼、積碳等缺陷出現(xiàn)的可能性。但是到目前為止,市場(chǎng)上還沒有鋁合金及鎂合金專用的消失模鑄造涂料,所以本文在于開發(fā)出綜合性能優(yōu)異的兩種涂料。本文通過測(cè)試不同耐火骨料配比下的涂料性能,分別確定了適用于鋁合金以及鎂合金的耐火骨料,并且優(yōu)化了涂料的耐火骨料配比;通過采用單因素實(shí)驗(yàn),研究改變粘結(jié)劑以及懸浮劑的加入量后,涂料的性能變化,確定粘結(jié)劑和懸浮劑的較合適的加入量,特別有提到新型懸浮劑硅酸鎂鋁,還有鈉基膨潤土與羧甲基纖維素鈉復(fù)配同鈉基膨潤土與黃原膠復(fù)配的效果對(duì)比;通過正交試驗(yàn),極差分析以及涂料的各項(xiàng)性能指標(biāo),確定了涂料的最佳配比,并通過掃描電鏡對(duì)涂層進(jìn)行微觀形貌分析。實(shí)驗(yàn)研究表明:(1)對(duì)于鋁合金消失模鑄造涂料,以硅藻土70%、莫來石30%的比例作為復(fù)合耐火骨料,懸浮劑鈉基膨潤土6%、CMC0.5%,粘結(jié)劑PVA1.5%、水玻璃6%,適量的添加劑和水,形成最佳配方。其綜合性能達(dá)到消失模鑄造涂料的要求。(2)新型懸浮劑硅酸鎂鋁的加入量對(duì)鋁合金鑄造涂料的流變性、懸浮性有很大的影響。當(dāng)硅酸鎂鋁的加入量為0.5%-3%時(shí),涂料的屈服值隨著硅酸鎂鋁加入量的增大而逐漸增大,觸變指數(shù)c在硅酸鎂鋁的加入量為1%-3%時(shí)也逐漸增大,涂料的流變性能得到提高。再者涂料的懸浮性與屈服值之間存在正相關(guān)的聯(lián)系。最終確定了硅酸鎂鋁較佳的加入量為2%-3%,涂料表現(xiàn)出優(yōu)異的懸浮性和流變性,懸浮性≥96%,觸變指數(shù)c≥1.343。(3)對(duì)于鎂合金消失模鑄造涂料,以輕質(zhì)氧化鎂70%、滑石粉30%的比例作為復(fù)合耐火骨料,懸浮劑鈉基膨潤土2%、黃原膠0.3%,粘結(jié)劑PVM0.05%、水玻璃8%,硼酸鋅4%,適量的添加劑和水,形成最佳配方。其綜合性能達(dá)到消失模鑄造涂料的要求。(4)在相同加入量下的CMC與黃原膠,當(dāng)二者的加入量均在0.3%-0.7%范圍時(shí),加入黃原膠的涂料懸浮性、抗壓強(qiáng)度以及流變性能優(yōu)于加入CMC的涂料,流杯粘度也明顯高于加入CMC的涂料,但當(dāng)二者的加入量均為0.1%時(shí),加入黃原膠的涂料的綜合性能要遜于加入CMC的涂料。
[Abstract]:EPC is an important way to cast aluminum alloy and magnesium alloy. The casting coating plays an important role in casting quality, especially it can improve the surface finish and dimensional precision of casting. Reducing the possibility of defects such as pinhole, cold barrier, sand, sand, sand, carbon deposit, etc. But so far, there is no aluminum alloy and magnesium alloy dedicated EPC coating on the market, Therefore, two kinds of coatings with excellent comprehensive properties are developed in this paper. The refractory aggregate suitable for aluminum alloy and magnesium alloy is determined by testing the coating properties under different ratio of refractory aggregate. And optimized the ratio of refractory aggregate of coating, through the single factor experiment, studied the change of the performance of the coating after changing the amount of binder and suspending agent, determined the more suitable addition quantity of binder and suspension agent, In particular, mention was made of the effects of a new suspension, magnesium and aluminium silicate, and of sodium bentonite and carboxymethyl cellulose sodium mixed with sodium bentonite and xanthan gum, and of the performance of the coating through orthogonal tests, range analysis and coatings, The optimum proportion of the coating was determined, and the microstructure of the coating was analyzed by scanning electron microscope. The experimental results showed that the proportion of diatomite 70 and mullite 30% was used as the composite refractory aggregate for the aluminum alloy lost foam casting coating. Suspension sodium-bentonite 6 / CMC0.5, binder PVA1.5, sodium silicate 6, appropriate amount of additive and water, to form the best formula. Its comprehensive properties meet the requirements of lost foam casting coating. When the content of magnesium aluminum silicate is 0.5-3%, the yield value of the coating increases with the increase of the amount of magnesium aluminum silicate, and the thixotropy index c increases gradually when the addition amount of magnesium aluminum silicate is between 1% and 3%. The rheological properties of the coating were improved. Furthermore, there was a positive correlation between the suspension property and yield value of the coating. Finally, the optimum addition amount of magnesium aluminum silicate was determined to be 2-3. The coating showed excellent suspension and rheological properties. For magnesium alloy EPC coatings, the proportion of light magnesium oxide 70 and talc 30% is used as composite refractory aggregate. Suspension sodium bentonite 2, xanthan gum 0.3, binder PVM 0.05, sodium silicate 8, zinc borate 4, appropriate amount of additives and water, forming the best formula. Its comprehensive properties meet the requirements of EPC coating. When both of them were in the range of 0.3% -0.7%, the suspension, compressive strength and rheological properties of the coating with xanthan gum were better than those of the coating added with CMC, and the viscosity of the cup was obviously higher than that of the coating added with CMC, but when the addition amount of xanthan gum was 0.1%, the viscosity of the coating was also higher than that of the coating added with CMC. The comprehensive performance of the coating added xanthan gum is inferior to that of the coating with CMC.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG22

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