本文選題：干壓成型　切入點(diǎn)：發(fā)泡劑　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：利用多孔吸聲陶瓷進(jìn)行消聲降噪是目前控制日益嚴(yán)重的噪聲問題的主要方法之一,多孔吸聲陶瓷具有強(qiáng)度高、耐高溫、耐腐蝕等優(yōu)點(diǎn),應(yīng)用前景廣泛。本文以碳化硅為造孔劑或以碳化硅和氧化鐵共同發(fā)泡,通過干壓成型方法制備了多孔吸聲陶瓷。首先,以陶瓷坯料、球土、燒滑石和鉀長石作為基礎(chǔ)原料,通過正交實(shí)驗(yàn)研究分析了各組分對多孔陶瓷的顯氣孔率、吸水率和體積密度的影響,選擇其中顯氣孔率、吸水率高的試樣配方作為本實(shí)驗(yàn)的基礎(chǔ)配方,即陶瓷坯料55.00 wt.%,球土15.00 wt.%,燒滑石18.00 wt.%,鉀長石12.00 wt.%;在此配方的基礎(chǔ)上,研究了各原料在配方中的比例對制品性能的影響,并分別詳細(xì)探討了碳化硅添加量以及升溫速率、保溫時間、球磨時間、燒成溫度和成型壓力這些因素對制品顯氣孔率、體積密度和顯微結(jié)構(gòu)的影響;通過正交試驗(yàn)確定了最佳工藝參數(shù):Si C添加量0.60 wt.%,升溫速率6℃/min,保溫時間25min,球磨時間84min,燒成溫度1180℃,成型壓力8MPa,在該優(yōu)化條件下所制備的多孔吸聲陶瓷性能為:顯氣孔率65.20%,吸水率101.50%,體積密度0.65,并在200~2000Hz的頻率范圍內(nèi),吸聲系數(shù)于1600Hz處達(dá)到最大值0.53。在此基礎(chǔ)上,研究利用氧化鐵與碳化硅共同發(fā)泡來提高多孔陶瓷的吸聲性能。分別探究了碳化硅與氧化鐵的質(zhì)量比、升溫速率、燒成溫度和成型壓力對制品顯氣孔率、體積密度和顯微結(jié)構(gòu)的影響;對這些因素進(jìn)行正交試驗(yàn)確定了最優(yōu)方案為:碳化硅和氧化鐵含量比1.6,升溫速率6℃/min,成型壓力10MPa,燒成溫度1180℃。通過該方案制備了多孔吸聲陶瓷,其顯氣孔率為77.20%,吸水率達(dá)到212.00wt%,體積密度0.37,而在200~2000Hz的頻率范圍內(nèi)測試其吸聲系數(shù)時,于1000Hz處達(dá)到最大值0.76,制品吸聲系數(shù)比僅用碳化硅發(fā)泡制備試樣高出約0.23。這說明此時制備的多孔吸聲陶瓷的吸聲性能得到顯著提高,達(dá)到較高水平最后,為進(jìn)一步提高制品吸聲性能,探究了試樣厚度和其背后空腔對吸聲性能的影響,結(jié)果表明:適當(dāng)?shù)脑黾雍穸群涂涨缓穸榷加欣谔岣咴嚇拥牡皖l吸聲性能,且隨這兩者厚度的增加,試樣吸聲峰均出現(xiàn)向低頻方向移動的現(xiàn)象。本文利用氧化鐵與碳化硅共同發(fā)泡,通過干壓成型法制備了吸聲性能較好的多孔吸聲陶瓷,為高吸音多孔陶瓷實(shí)現(xiàn)產(chǎn)業(yè)化生產(chǎn)提供了可參考的途徑,具有重要的理論價值和實(shí)踐指導(dǎo)意義。
[Abstract]:The use of porous ceramics for noise reduction is one of the main methods of noise control of the increasingly serious problem at present, the porous ceramics with high strength, high temperature resistance, corrosion resistance and other advantages, has broad application prospect. In this paper, silicon carbide or silicon carbide as the pore forming agent and ferric oxide to common foaming, by dry pressing method for preparing porous sound absorption ceramic. First, the ceramic blank, ball clay, talc and burning potassium feldspar as basic raw materials, through the orthogonal experimental study on the components of the porosity, water absorption effect and bulk density, the porosity, water absorption test formula with high basic formula for this experiment, i.e. ceramic ball clay 55 wt.%, 15 wt.%, 18 wt.% burn talc, potassium feldspar 12 wt.%; based on the formula of influence of the proportion of each raw material in the formulation of product performance, and Don't discuss silicon carbide content and heating rate, holding time, milling time, sintering temperature and forming pressure of these factors on porosity of products, influence of volume density and microstructure; through orthogonal test to determine the best process parameters: Si C dosage of 0.60 wt.%, the heating rate of 6 DEG /min, holding time 25min 84min, milling time, sintering temperature of 1180 DEG C, forming pressure 8MPa, under the optimal conditions of porous ceramic absorption properties were as follows: 65.20% porosity, water absorption rate of 101.50%, the volume density of 0.65, and in the 200~2000Hz frequency range, the sound absorption coefficient at 1600Hz reached the maximum value on the basis of 0.53. the research, using ferric oxide and silicon carbide foam together to improve the sound absorption properties of porous ceramics were investigated. The mass ratio of silicon carbide and iron oxide, heating rate, sintering temperature and molding pressure on the product porosity, body Effect of density and microstructure of the product; for these factors orthogonal test to determine the optimal scheme for silicon carbide and iron oxide content of more than 1.6, the heating rate of 6 DEG /min, 10MPa forming pressure and firing temperature of 1180 DEG C. Through the program preparation of porous ceramics, its porosity was 77.20%, water absorption rate of 212.00wt% 0.37, the volume density, test the sound absorption coefficient in the frequency range of 200~2000Hz to 1000Hz, reaches a maximum at 0.76, the absorption coefficient of samples than the products only with silicon carbide foaming higher than about 0.23. indicating that at this time the sound absorption properties of porous ceramics prepared by the sound absorption is greatly improved, finally reached a higher level, for to further improve the sound absorption performance of products, explores the effects of specimen thickness and the cavity, the sound absorption performance results show that properly increasing thickness and cavity thickness are beneficial to improving the low-frequency sound absorption of the samples Can, and with the increase in the thickness of the sample absorption peak appeared shifted to the low frequency phenomenon. This paper using iron oxide and silicon carbide together by dry porous ceramic foam, good sound absorption performance of the molding preparation, provides the way for high sound absorption of porous ceramic realize industrial production has important the theoretical value and practical significance.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ174.1

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