基于正交试验的触摸屏玻璃成分优化研究

通过正交试验方法熔制玻璃样品,测试不同组分玻璃样品的抗折强度和弹性模量。研究结果表明:SiO_2、Al_2O_3、R_2O、RO对玻璃的抗折强度和弹性模量影响程度不同,随着RO含量的增加弹性模量和抗折强度均减小;硅含量的增加有助于提高玻璃的抗折强度,铝含量的增加有助于提高玻璃的弹性模量。     

基于DOE方法分析和优化盖板玻璃边缘磨削工艺

四点抗折强度是手机盖板玻璃材料的一个重要强度指标,玻璃边缘加工质量对四点抗折强度值有很大影响。在玻璃边缘磨削加工时,各种加工因素对加工质量的影响相交复杂。通过实验优化工艺参数,得到较好的四点抗折强度,获得最佳的边缘质量,是目前手机盖板玻璃边缘磨削质量的主要方法。按照DOE方法进行实验设计和数据统计分析,确定优化的参数,并进行验证实验,取得较好的效果,对边缘加工工艺的改进起了很好的指导作用。     

冷却工艺对CaO-Al2O3-SiO2系微晶玻璃强度及热膨胀性能的影响

将某一固定组成的CaO-Al2O3-SiO2系玻璃烧结到一定温度后,采用不同的冷却工艺得到若干试样。通过X衍射分析、抗折强度和热膨胀系数的测定,研究了冷却温度制度对CaO-Al2O3-SiO2系微晶玻璃强度及热膨胀性能的影响。研究发现随着微晶玻璃的起始冷却温度逐渐升高,试样的抗折强度逐渐提高,热膨胀系数逐渐减小。     

烧结法微晶玻璃装饰板材的力学性能研究

本文研究了烧结法微晶玻璃装饰板材的密度、抗折强度等力学性能,讨论了成分、结构对密度、抗折强度的影响.     

环保型热熔玻璃的制备及性能研究

以95％～99％的废旧玻璃为主要原料,以1％～5％的石英砂为纹理形成剂,制备了建筑用环保型热熔玻璃。研究了纹理形成剂石英砂用量、烧成温度、保温时间对热熔玻璃力学性能的影响。结果表明：随石英砂用量的增加,试样的抗折强度逐渐降低,随烧成温度的升高,试样的抗折强度逐渐升高;随保温时间的延长,试样的抗折强度逐渐升高。试样中加入3％的石英砂,在900℃下,保温90min所制备的热熔玻璃抗折强度为5.6MPa,热稳定性、耐酸性及耐碱性好,透光率高,且纹理面上无残余应力。     

热处理温度对赤泥粉煤灰玻璃陶瓷抗折强度的影响

以赤泥和粉煤灰为主要原料,添加适量的助熔剂,制备了赤泥粉煤灰微晶玻璃。通过差热分析(DTA)确定了热处理温度。研究了不同的热处理温度对赤泥粉煤灰玻璃陶瓷抗折强度的影响,并采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了晶相和微观结构。通过试验研究表明,热处理温度对赤泥粉煤灰玻璃陶瓷的抗折强度有较大影响,最佳的热处理温度是830℃。     

整体析晶法矿渣微晶玻璃的研制

以宝钢高炉矿渣为原料整体析晶法制备矿渣微晶玻璃,通过DTA确定微晶玻璃的热处理制度,通过XRD确定玻璃的主晶相,利用SEM观察微晶玻璃的显微形貌,并对微晶玻璃的抗折强度进行测试。     

发泡剂对钼渣多孔玻璃性能的影响

采用高温熔融直接发泡制备钼渣多孔玻璃,通过研究不同发泡剂对钼渣多孔玻璃性能的影响,确定最佳发泡剂,研究了最佳发泡剂含量对钼渣多孔玻璃气孔率和抗折强度的影响.结果表明,BaCO3在本体系中发泡效果最好,随着发泡剂BaCO3含量的增加,钼渣多孔玻璃气孔率和抗折强度均发生变化,当BaCO3含量10%wt时,气孔率最高,为16.8%.X射线衍射分析钼渣多孔玻璃有少量石英残留,显微结构表明孔结构基本上不连通,为闭孔材料.     

稀土La_2O_3对Li_2O-Al_2O_3-SiO_2微晶玻璃结构和性能的影响

本文主要研究添加微量稀土La2O3对Li2O-Al2O3-SiO2微晶玻璃晶相组成、显微结构、抗折强度的影响。研究结果表明:添加微量La2O3有利于Li2O-Al2O3-SiO2微晶玻璃中的主晶相β-锂辉石发育成完整的柱状、板状晶体,提高了微晶玻璃的抗折强度。     

含玻璃砂的高性能碱激发矿渣砂浆性能研究

采用玻璃砂代替部分细骨料制备碱激发矿渣(AAS)砂浆后,研究了玻璃砂含量(0%、10%、20%、30%,质量分数)对AAS砂浆抗压强度、抗折强度、干燥收缩、导热系数和碱-硅酸反应(ASR)膨胀率的影响,并通过扫描电子显微镜(SEM)对微观机理进行了分析。结果表明：掺10%～30%的玻璃砂能显著提高AAS砂浆的早期抗压强度,但会略微降低28 d抗压强度;AAS砂浆的抗折强度随玻璃砂掺量的增加先增大后减小,10%掺量时最有利于3 d抗折强度,20%掺量时最有利于28 d抗折强度;AAS砂浆的干燥收缩、导热系数和ASR膨胀率均随玻璃砂掺量的增加而减小,与对照组相比,掺30%玻璃砂的AAS砂浆导热系数降低14.4%,56 d干燥收缩率降低27.6%,14 d ASR膨胀率降低39.6%,28 d ASR膨胀率降低34.5%;SEM分析发现玻璃砂表面有水化产物生成,其与胶凝材料的结合比石英砂更紧密,使AAS砂浆的微观结构更加致密。     

Weakening of Soda-Lime Glass by Particle Impact During Hydrofluoric Acid Etching

During etching of soda-lime glass in hydrofluoric acid solutions, insoluble reaction products can collect in the acid solution or deposit on the glass surface. In this study it is shown that impact of these insoluble reaction products on the etching surfaces can cause strength degradation. The insoluble reaction products are characterized by scanning electron microscopy, wet chemical, X-ray diffraction, and surface area analyses.     

从废ITO玻璃回收铟及制备高品质玻璃

为回收废弃LCD面板中的金属铟及高品质玻璃,提出了一种铟锡氧化物(ITO)玻璃资源化回收方法,用HF溶液浸蚀ITO玻璃碎片得富铟溶液和经表面除杂的玻璃基板,富铟溶液经蒸发、浓缩得富铟物,将富铟物溶解并经铝置换、熔炼、提纯得到粗铟,玻璃基板作为配合料进行再生制样. 结果表明,ITO玻璃破碎会造成铟流失,8 mol/L HF在3 h内即可有效回收ITO中的铟,制得纯度达92.3%的粗铟,回收率达89.2%. 再生玻璃试样成型温度为1462℃,热膨胀系数最大为3.2′10-6/℃,维氏硬度平均值为584.9,密度为2.43097 g/cm3,可见光透射比为75.2,部分性能有所下降,可降低配合料用量,以实现ITO玻璃基板的资源化回收.     

Stress Superposition in High-Strength Glass

The introduction of surface compression via alkali-ion exchange is frequently used to strengthen alkali-containing glass. However, previous investigators found that when starting with high-strength glass, the strength measured after exchange was significantly less than the sum of the residual compression and the starting fracture strength. Results are presented which suggest that the source of this discrepancy is surface damage produced during the heat treatment accompanying the ion-exchange process. Further, when the surface damage was removed by shallow hydrofluoric acid etching, the resulting fracture strength did approximately equal the sum of the residual stress and the high starting strength.     

Effect of normal scratch load and HF etching on the mechanical behavior of annealed and chemically strengthened aluminosilicate glass

Micro-cracks generated by hard body scratch are a major cause of strength decrease for silicate glass. The influence of normal scratch load on the cracking patterns and flexural strength of annealed glass (AG) and chemically strengthened glass (CSG) were studied. With the increase of the normal load, the load capacity of scratched AG specimens decreased to about 40 MPa at 20gf immediately. However, the residual strength of CSG decreased to a steady value of 145 MPa as the scratch load increased to 500gf. Then the effect of hydrofluoric acid (HF) etching on the surface morphology and mechanical properties of the 500gf scratched glass were investigated. After 8min (for CSG) and 16 min (for AG) acid treatment, the flexural strength of CSG and AG increased to a considerable value of 900 MPa, which is 3.6 and 5.5 times higher than the flexural strength of undamaged specimens. Microscopic observations show that the blunting and eliminating of median cracks as well as the formation of new surfaces are the main causes of strength enhancement.     

Acid etching and silica coating effects on Y-TZP topography and ceramic/resin cement bond strength

Zirconia-based (Y-TZP) dental prostheses' retention loss remains one of the most frequently reported difficulties in dental practice. Selective Infiltration Etching (SIE) treatment has been proposed to alter the final Y-TZP topography improving its bond strength to resin cement. SIE consists of glass film deposition on the Y-TZP surface before glass removal with 10% hydrofluoric acid etching. This study's objective was to investigate the effects of SIE protocol steps on Y-TZP topography and its consequence on its bond strength to resin cement. The SIE protocol was divided into two main steps: silica coating (first step) and glass dissolution by hydrofluoric acid (second step), and the null hypothesis was that the SIE treatment has the same bond quality independently of the HF exposition time. Atomic Force Microscopy (AFM), Scanning Electron and Transmission Electron microscopy were used to characterize the zirconia surfaces. The bond strength was evaluated by the interfacial fracture toughness test, and data were analyzed by ANOVA and Tukey's Test (5%). As the main result, it was shown that, when exposed during sufficient time, the 10% HF can etch zirconia at room temperature, which is responsible for topographic changes, significantly improving the bond quality. Additionally, no glass components or dihedral angles modifications were observed at Y-TZP grain boundaries after silica coating. With the study limitations, it was possible to infer that the surface-modifying agent in SIE protocol is the HF etching, and the null hypothesis was rejected.     

基于EHD的PVA薄膜图案化及其在玻璃表面微结构制造中的应用

以电流体动力(EHD)诱导聚乙烯醇(PVA)薄膜表面微结构的形成为对象,研究了不同EHD工艺和氢氟酸刻蚀工艺对PVA薄膜微图案结构及玻璃表面微结构制备和光学性能的影响,提出了一种利用PVA微图案结构调控氢氟酸刻蚀玻璃表面制备光学微结构的新方法.结果表明,改变EHD诱导电压和PVA薄膜初始厚度可以得到区别化的PVA薄膜微...     

Pressable Glass Ceramic as a Repair Material for Fractures in Metal-Ceramic Restorations

Porcelain repair of fractured metal-ceramic restorations is a common challenge in the dental field. The current study introduces a novel technique for intraoral repair of porcelain fracture utilizing pressable glass ceramic (GC) as the repair material. The shear bond strength (SBS) of GC to different components of the metal-ceramic restoration (metal, porcelain, and metal-porcelain combination) under different surface treatments was also evaluated. The SBS was tested under the following five surface treatments: control, sandblasted with silica, sandblasted with silica then glow-discharge-treated, sandblasted with alumina, and sandblasted with alumina then etched with hydrofluoric acid. A self-adhesive resin cement and silane were used for bonding. Surface roughness was evaluated before and after each treatment. One-way ANOVA and post-hock Tukey's tests were used for data analysis. The results showed that SBS of GC to all surface-treated substrata ranging from 37 to 55 MPa was significantly higher than that of untreated surfaces ranging from 10 to 26 MPa. For all bonded surfaces, blasting with silica showed higher bond strength than blasting with alumina. On the contrary, alumina groups showed higher surface roughness than silica groups. Pressable glass ceramic in conjunction with all tested surface treatments, especially silica blasting, can be used successfully for fractured porcelain repair.     

Extraction of protactinium from acid media using Aliquat 336

Solvent extraction studies on protactinium were carried out from hydrofluoric acid, hydrochloric acid, and a mixture of hydrochloric and hydrofluoric acids using Aliquat 336 and ²³¹Pa. The extraction of protactinium from hydrofluoric acid (0.025–10 M) decreased with increasing acid concentration and was less than 10% above 5 M. The extraction from hydrochloric acid (0.5–8 M) started only above 4 M and increased with increasing acid concentration. The extraction of protactinium from a mixture containing hydrochloric acid (0.5–8 M) and 0.03 M hydrofluoric acid decreased with increasing acid concentration reached to a minimum at about 2 M and then increased with increasing acid concentration. At low acidity, extraction of protactinium from hydrofluoric acid was higher compared to hydrochloric acid and the mixture of hydrochloric and hydrofluoric acids. Nitric acid (10 M) and hydrofluoric acid (10 M) were suitable for quantitative recovery of protactinium from organic phase. The extraction of ²³¹Pa from real thorium lean raffinate of thorium–uranium extraction process was studied using optimized extraction conditions.     

用磷肥废气、水玻璃制备纳米二氧硅和氟化钠中试

以生产磷肥的废气和水玻璃为原料,制备出了纳米二氧化硅和氟化钠。磷肥或盐生产过程中产生的废气,含有大量的氟化氢和四氟化硅,与水玻璃在一定条件下反应,可生成硅溶胶和氟化钠溶液。硅溶胶经陈化、分离、洗涤、高温煅烧,可得纳米级二氧化硅;溶液经蒸发、冷却、结晶、分离、干燥,可得工业级氟化钠。本工艺变废物为资源,无二次污染,符合绿色环保、循环经济的原则,产品质量符合行业标准,经济效益较高。     

Bonding of Titanium Alloys

Surface pretreatments affect joint strength, some improve it, e.g. etching in aqueous hydrofluoric acid or oxidation in alkaline hydrogen peroxide; while others decrease the strength e.g. etching in acids containing high concentrations of oxidising agents.

For Ti-6A1-4V alloy, best results are obtained by either etching in aqueous hydrofluoric acid or oxidation in alkaline hydrogen peroxide for about two hours.

The results indicate that a pretreatment which leaves a coherent TiO₂-rutile layer, on a rough surface, form the strongest joints. Surface roughness is shown to enhance bond strength.