本文選題：PZT5壓電陶瓷管 + 大長徑比��； 參考：《濟南大學(xué)》2015年碩士論文

【摘要】：相比于傳統(tǒng)塊狀、片狀壓電陶瓷材料,大長徑比壓電陶瓷管不僅具有優(yōu)良的壓電、介電性能,還具有柔韌性好,體積小,易與基體結(jié)構(gòu)集成,以及使用時電場損失小等特點。大長徑比壓電陶瓷管的制備可以有效的解決傳統(tǒng)壓電陶瓷材料集成時對結(jié)構(gòu)強度和可靠性影響大的問題,進一步推動主動振動控制復(fù)合材料及壓電儲能復(fù)合材料的優(yōu)化和應(yīng)用。本文以PZT5壓電陶瓷預(yù)燒粉為原料,采用塑性聚合物-擠制成型法制備固相含量不同的PZT5大長徑比壓電陶瓷管素坯；經(jīng)排膠及不同條件下燒結(jié),制得PZT5大長徑比壓電陶瓷管。分別采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)和排水法測定陶瓷管的相組成、顯微結(jié)構(gòu)和體積密度。研究了陶瓷泥料配方、燒成溫度、保溫時間和燒成氣氛對PZT5陶瓷管相組成、顯微結(jié)構(gòu)和體積密度的影響。結(jié)果表明,采用塑性聚合物-擠制成型法可成功制備出平直、表面光滑的長150mm,外徑1.98 mm,內(nèi)徑0.8mm的PZT5大長徑比壓電陶瓷管；最佳陶瓷泥料配方為陶瓷預(yù)燒粉：聚乙烯醇水溶液(10%)：丙三醇=26：3：1,此時陶瓷固相含量為87%；最佳燒成條件為1290℃下燒結(jié),保溫2h,同時采用ZrO2和Pb304的混合物作為埋燒粉；所得陶瓷管由單一鈣鈦礦相組成,無Zr02、燒綠石或其他雜相；晶粒大小均勻,晶界清晰,結(jié)構(gòu)致密,晶粒尺寸為2-5μm,體積密度為7.70 g/cm3。采用化學(xué)鍍鎳法在PZT5大長徑比壓電陶瓷管內(nèi)外壁鍍覆電極。首先,以鍍速和電阻率為指標(biāo),采用正交試驗法確定出PZT5大長徑比壓電陶瓷管化學(xué)鍍鎳最佳粗化工藝參數(shù)；然后,采用單因素實驗法研究各粗化參數(shù)對PZT5大長徑比壓電陶瓷管化學(xué)鍍鎳層性能的影響；最后,綜合對比兩組實驗結(jié)果,確定PZT5大長徑比壓電陶瓷管化學(xué)鍍鎳最佳粗化方案。結(jié)果表明,PZT5大長徑比壓電陶瓷管內(nèi)外壁化學(xué)鍍鎳最優(yōu)粗化方案為：粗化液中氫氧化鈉質(zhì)量分數(shù)為20%、粗化溫度為25℃、粗化時間為35 min、粗化液中乙二胺濃度為30 mL/L。選用此粗化方案對PZT5大長徑比壓電陶瓷管進行粗化處理,可在PZT5陶瓷管內(nèi)外壁獲得光亮、均勻、致密、結(jié)合力好、電阻率小的鎳電極。采用真空極化法對PZT5大長徑比壓電陶瓷管進行極化處理。采用Agilent 4294A型精密阻抗分析儀測量極化后PZT5大長徑比壓電陶瓷管的諧振頻率fr、反諧振頻率fa、電容C和介電損耗tanδ,并通過諧振頻率-反諧振頻率法與電容法推算PZT5壓電陶瓷管的橫向機電耦合系數(shù)K31和相對介電常數(shù)εr。研究了極化電場、極化溫度、極化時間對PZT5大長徑比壓電陶瓷管壓電、介電性能的影響。結(jié)果表明,采用真空極化法可成功實現(xiàn)PZT5大長徑比壓電陶瓷管的有效極化；最佳極化參數(shù)為：極化電場為2.0 kV/mm,極化溫度為25℃,極化時間為10 min。用ZJ-6A型準(zhǔn)靜態(tài)d33測量儀測量PZT5壓電陶瓷管的壓電應(yīng)變常數(shù)d33。用Agilent4294A型精密阻抗分析儀測試陶瓷管在1 kHz時的電容C和介電損耗tanδ,并進一步推算PZT5壓電陶瓷管的相對介電常數(shù)εr。用Agilent 4294A型精密阻抗分析儀測試陶瓷管的諧振頻率fr、反諧振頻率fa及最小阻抗Zmin,并通過諧振頻率-反諧振頻率法推算出PZT5大長徑比壓電陶瓷管的橫向機電耦合系數(shù)K31和機械品質(zhì)因素Qm。測試及計算結(jié)果如下：壓電應(yīng)變常數(shù)d33為579 pC/N,橫向機電耦合系數(shù)K31為0.49,相對介電常數(shù)εr為1789,介電損耗tanδ為0.026,機械品質(zhì)因素Qm為11。
[Abstract]:Compared with the traditional block - shaped piezoelectric ceramic tube , the piezoelectric ceramic tube not only has excellent piezoelectric and dielectric properties , but also has the characteristics of good flexibility , small volume , easy integration with the base structure , small electric field loss during use , and the like , and further promotes the optimization and application of the active vibration control composite material and the piezoelectric energy storage composite material .
The phase composition , microstructure and bulk density of PZT5 ceramic tube were measured by means of X - ray diffraction ( XRD ) , scanning electron microscope ( SEM ) and drainage method . The effects of the formula , firing temperature , holding time and firing atmosphere on the composition , microstructure and bulk density of PZT5 ceramic tube were studied .
The best ceramic paste formulation is ceramic pre - sintered powder : polyvinyl alcohol aqueous solution ( 10 % ) : glycerol = 26 : 3 : 1 , at this time the content of ceramic solid phase is 87 % ;
the best firing condition is sintering at 129.degree . C . for 2 h , and the mixture of ZrO2 and Pb304 is adopted as the embedded burning powder ;
The obtained ceramic tube is composed of a single perovskite phase , no Zr02 , pyrochlore or other impurities ;
The size of grain is uniform , the grain boundary is clear , the structure is compact , the grain size is 2 - 5 渭m , the volume density is 7.70 g / cm3 .
Then , the influence of roughening parameters on the properties of electroless nickel plating layer of PZT5 was studied by single factor experiment .
The results show that the optimal scheme for electroless nickel plating of PZT5 large - length - diameter piezoelectric ceramic tube is as follows : the mass fraction of sodium hydroxide in the coarse liquid is 20 % , the roughening temperature is 25 鈩，

本文編號：1900665