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cpy1239860銀蟲 (小有名氣)
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金剛石微粉密度大，納米級(jí)顆粒易于團(tuán)聚，微米級(jí)較大顆粒易于沉降，致使整個(gè)研磨液體系均勻性較差，影響拋光的質(zhì)量和效率。目前對納米金剛石懸浮液的研究非常多，但納米金剛石的粒徑限定范圍比較窄，應(yīng)用范圍有限，而實(shí)際生產(chǎn)中對微米金剛石懸浮液的需求也很廣，但是對微米級(jí)的金剛石的研究很少涉及。 本文研究了金剛石微粉在水性分散體系中的分散性能，以沉降實(shí)驗(yàn)、Zeta電位測定為評價(jià)指標(biāo)，研究了PH值、分散劑的種類與用量及分散工藝條件對分散穩(wěn)定性的影響。實(shí)驗(yàn)表明：在水性分散體系中，懸浮液的PH值是影響其分散穩(wěn)定性能的重要因素，主要影響粒子的表面電荷狀態(tài)；金剛石微粉懸浮液中顆粒的等電點(diǎn)PH(I.P.C)=5.4而且粉體表面的Zeta電位絕對值在堿性區(qū)比在酸性區(qū)普遍要高得多，一般適宜PH值為8-10；小分子分散劑可以起到一定的分散作用，但對懸浮穩(wěn)定性不于高聚物分散劑和非離子型表面活性劑。同時(shí)實(shí)驗(yàn)表明選擇多種不同分散機(jī)理的分散試劑相復(fù)合分散效果要優(yōu)于單獨(dú)使用某一分散試劑時(shí)的分散效果。實(shí)驗(yàn)得到的經(jīng)過海藻酸鈉、D540分散劑 、TH-613分散劑和PVA的復(fù)配分散劑為分散劑制備金剛石懸浮液復(fù)配的分散劑分散效果最佳，靜置一周后上層的澄清體積為10%。 本文采用粗化處理和偶聯(lián)劑包覆改性對金剛石微粉進(jìn)行表面處理，通過紅外光譜分析和粉體潤濕性測試表明靜壓法合成的金剛石表面不含含氧官能團(tuán)，水溶性鈦酸酯偶聯(lián)劑YB401包覆在金剛石表面形成單層油膜，從而實(shí)現(xiàn)表面有機(jī)化，使金剛石顆粒與水的親和性變差，呈現(xiàn)明顯的疏水親油性能。采用YB401偶聯(lián)處理后的金剛石微粉制備的懸浮液30天后澄清體積僅為3%，同時(shí)通過陳化實(shí)驗(yàn)表明懸浮液的分散穩(wěn)定性變差與懸浮液PH值的而變化和粉體表面的Zeta電位的變化有關(guān)，而采用鈦酸酯偶聯(lián)劑 處理可以減緩這個(gè)變化，其更深層次的原因還有待進(jìn)一步的研究。 [ Last edited by cpy1239860 on 2011-11-18 at 17:09 ] |
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cpy1239860
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2樓2011-11-22 09:48:22
fanliang1389
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3樓2011-11-23 10:45:45
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愛與雨下(金幣+3): 2011-11-23 15:57:07
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As large diamond powder density, nano-particles ease to reunion and larger micro-sized particles easy to settle, which led to a poor uniformity of slurry system, thereby affecting the quality and efficiency of polishing. Currently, there has been an extensive research on nano-diamond suspension. However, as its relatively narrow scope of particle size, its application is limited. Although in actual production, the demand for micron diamond suspension is very broad, the research for it is rare. In this paper, we take settlement experiment, Zeta potential measurement as the evaluation indexes to study the dispersion of diamond powder in aqueous dispersion, and study the effects of PH value, type and amount of dispersant, dispersion processing conditions on its dispersion stability. The results show that: in aqueous dispersion, an important factor that affects the suspension’s dispersion stability is its PH value, which mainly affects the surface charge of its particles. In diamond powder suspension, the isoelectric point of its particles is PH (IPC) = 5.4. Generally, on the surface of powder, the absolute value of Zeta potential in alkaline region is much higher than that in acidic region with the appropriate PH value between 8 to 10. Small molecule can play as a dispersing agent, but its suspension stability is more poor completed with polymer dispersant and non-ionic surfactant. The results also show that the dispersion of a blend that containing dispersing agents with different dispersing mechanism is superior to a single one. Taking a blend of sodium alginate, dispersant-D540, dispersant TH-613 and PVA as dispersant, we prepared a kind of diamond suspension with the best dispersing effect, whose upper clarify volume accounts for 10 percent after resting for a week. In this paper, through coarsening processing and coupling agent-coated modification of diamond powder on the surface, and the analysis of infrared spectroscopy and wettability powder test, we concluded that the surface of the diamond, synthesized by static pressure method, does not contain oxygen-containing groups; YB401, a water-soluble titanate coupling agent, is coated on the diamond surface, and then formed a single layer oil film, thus fulfilling the surface organic and making the affinity of diamond particles and water becomes worse, showing a clear hydrophobic lipophilic property. The clarify volume of diamond powder suspension is only 3 percent in 30 days after the process of YB401 coupling. The results of aging experiment show that: changes in its PH value and surface Zeta potential contribute to the poor dispersion stability, whereas some treatment can slow the changes by using titanate coupling agents. However, deeper reason still needs further research. |
4樓2011-11-23 14:24:57
aardwolf1986
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5樓2011-11-23 15:05:35
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