羟基磷灰石和含氟羟基磷灰石涂层的制备技术

羟基磷灰石(HA)生物陶瓷涂层被认为是目前最好的用于替代人体硬组织的一种生物医用材料,具有很高的外科应用价值.含氟羟基磷灰石(FHA)涂层由于比羟基磷灰石涂层的溶解度低、热膨胀系数小且生物活性好,有着更为广泛的应用前景.对羟基磷灰石及其涂层的各种制备方法进行了概述,同时介绍了溶胶-凝胶法制备含氟羟基磷灰石涂层的技术特点,并对未来的发展前景进行了分析.     

钛合金表面制备羟基磷灰石生物陶瓷涂层研究进展

钛合金表面制备羟基磷灰石生物陶瓷涂层以其优异的力学性能和生物活性,成为近年来材料学家研究的热点医用材料之一。本文综述了在钛合金表面制备羟基磷灰石生物陶瓷涂层的研究进展,特别是在提高涂层结合强度和涂层结晶度方面的最新研究成果,展望了钛合金表面制备羟基磷灰石生物涂层复合材料的发展趋势和前景。     

HA生物活性陶瓷涂层制备方法研究进展

阐述了国内外学者对金属基羟基磷灰石生物活性涂层的研究状况，这了羟基磷灰石涂层的制备方法，认为该材料是最具有发展前景的生物硬组织替代材料之一。     

羟基磷灰石复合涂层制备的研究进展

将羟基磷灰石复合涂层按照特征分为三类,即单层复合涂层、双层复合涂层和梯度复合涂层。概述了这三类羟基磷灰石复合涂层的特点,并简要介绍这三类羟基磷灰石复合涂层的制备方法和研究进展,对开发出反应步骤更为简单,反应条件更为湿和,生物相容性更好的硬组织置换材料的研究前景进行了展望。     

羟基磷灰石生物陶瓷涂层制备方法评述

根据医用生物陶瓷羟基为磷灰石及医用金属材料的生物，力学特性，本文认为在金属基体表面涂覆羟基磷灰石是综合金属材料及生物陶瓷材料各自优越性阳有希望的途径这一。评述了羟基磷灰石涂层的制备方法，论证了较为优化的涂层结构。     

纳米医用生物陶瓷的制备研究进展

本文综述了牙科用氧化铝基生物陶瓷、羟基磷灰石生物涂层、多孔羟基磷灰石、羟基磷灰石/聚合物可降解生物复合材料、羟基磷灰石/ZrO2生物复合材料、β-Ca2P2O7生物材料等6种纳米医用生物陶瓷的制备研究进展,并对其制备研究进行了展望.     

等离子喷涂羟基磷灰石涂层

羟基磷灰石由于具有优良的生物性能，被广泛应用于生物材料领域，而等离子喷涂制备羟基磷灰石涂层是应用最为广泛的制备方法之一。在综合国内外献的基础上，本从羟基磷灰石的本征性能、喷涂工艺的影响、结合强度和梯度涂层等方面进行综述。     

一种表面仿生矿化涂层碳纤维增强聚乳酸材料的制备方法

本发明公开的表面仿生矿化涂层碳纤维增强聚乳酸材料的制备方法,其步骤为:先将碳纤维置于5倍浓度的模拟体液中浸泡,得到表面具有羟基磷灰石涂层的碳纤维;然后将丙交酯、表面具有羟基磷灰石涂层的碳纤维和辛酸亚锡催化剂     

等离子喷涂ZrO2对钛/羟基磷灰石力学性能的影响

研究了有ZrO2涂层与无ZrO2涂层的钛／羟基磷灰石复合材料的力学性能。研究表明无ZrO2涂层的钛／羟基磷灰石复合材料的力学性能明显受烧成时间的影响。通过SEM观察，没有发现在ZrO2涂层和钛基体材料之间有氧化物的生成。结果表明，ZrO2涂层在750℃温度下能够延缓钛基体材料的氧化。而且加强了和钛基之间的接合强度。     

等离子喷涂羟基磷灰石涂层

羟基磷灰石由于具有优良的生物性能，被广泛应用于生物材料领域，而等离子喷涂制备羟基磷灰石涂层是应用最为广泛的制各方法之一。在综合国内外文献的基础上，本文从羟基磷灰石的本征性能、喷涂工艺的影响、结合强度和梯度涂层等方面进行综述。     

Transition metal and metal oxide catalysed gasification of carbon by oxygen,water, and carbon dioxide

The oxygen transfer mechanism is examined for transition metal and metal oxide catalysed carbon gasification by oxygen, water, and carbon dioxide. The mechanism appears valid for the C-O₂ reaction due to the availability of weakly bound oxygen in the bulk metal oxide or on the surface of a metal oxide or a metal in an oxygen atmosphere. In water and carbon dioxide atmospheres, only oxygen strongly bound to the metal or metal oxide is present, resulting in negligible activity for carbon gasification through this mechanism. When the catalyst is present as a reduced metal, a different mechanism for catalysed gasification involving direct breakage of carbon-carbon bonds by the metal is suggested.     

杯芳烃与金属离子配合的最新进展

综述了近10年来杯芳烃及其衍生物与金属阳离子,主要包括碱金属、过渡金属、稀散元素和稀土金属配合的最新进展,对于萃取、回收和提纯某些重要的金属离子提供依据,尤其是杯芳烃与稀散元素的配合与反应,可能作为稀散元素回收和再利用的一种手段和方法。     

The Sintering of Supported Metal Catalysts

Metal catalysts are commonly employed in the form of metal dispersed as small crystallites on high surface area supports. The use of these supported metal catalysts increases the utilization of the metal as a catalyst since a large fraction of the metal atoms are at the surface of the small metal crystallites. Another important function of the support is to physically separate the small metal crystallites and thereby hinder the agglomeration of the small metal crystallites into larger crystallites. This agglomeration would decrease the number of surface metal atoms per unit mass of metal, and thereby decrease the utilization of the metal and the activity of the catalyst.     

羰基金属的来源、危害及中温羰基金属净化剂的研制

系统阐述了合成气中羰基金属的来源及其危害。采用挤条法成型,制得一种中温羰基金属净化剂,实验结果表明,该净化剂在原料气中羰基铁含量为100×10-6、CO含量≤10%、空速3 000h-1、温度200℃条件下,出口羰基铁含量≤0.1×10-6,对羰基铁具有良好的脱除活性,可以工业应用。     

CO为还原剂的脱硝催化剂研究进展

从活性组分、助剂和载体方面综述贵金属催化剂(Ir、Pd、Rh、Ru、Ag)及非贵金属催化剂的研究进展。比较不同催化剂脱硝活性,表明贵金属催化剂及部分非贵金属催化剂均具有一定的脱硝活性。对于贵金属催化剂,中低温活性较高,但热稳定性差,易烧结,且不经济。对于非贵金属催化剂,高温活性较高,稳定性较强。助剂的引入及载体性质对催化剂脱硝活性均有不同程度的影响。     

Sonochemical formation of metal sponges

A novel sonochemical method for formation of mesoporous metal sponges is developed. Systematic investigation of ultrasound effects on various types of metal particles reveals the cavitation-induced oxidation of metal surface and etching of metal matrix as main factors in the ultrasound-driven metal modification. Beyond the specific examples, the findings provide guidelines for expansion of the concept towards a broad variety of metal systems and allow development of the sonochemical approaches to manipulation of the metal surface and inner structure.     

金属丝机织网的厚度及其应用

主要介绍金属网几何结构的参数、金属网厚度的定义、金属网结构切面图,从而获得金属网厚度的数值,通过对卷绕金属网卷直径的计算,可以计算不同类型的织网设备所织规格的最大长度;可以计算规定长度金属网卷绕直径,为包装箱的设计提供重要参数;金属网的厚度也是多层烧结网工艺过程的重要参数。     

Adhesive strengths between glass fiber‐filled ABS and metal in insert molding with engraved and embossed metal surface treatments

Metal and plastic can be bonded in a single molding process by metal insert molding, in which a metal is inserted into a mold and a plastic resin is then injected. However, the adhesive strength at the interface between the metal and plastic is weakened by the difference in the shrinkage ratio and inherent differences between the materials in the metal insert molding. This study reports the treatment of a metal surface that is followed by inserting the metal into a mold to increase the adhesive strength between the metal and glass fiber (GF)‐filled acrylonitrile butadiene styrene (ABS). A laser process was used for an engraving surface treatment and a plating process was performed for an embossed surface treatment of the metal. In addition, the adhesive strength between the metal and GF‐filled ABS was evaluated after the insert molding process was completed. Particles such as glass beads, ceramic beads, artificial diamonds, and aluminum oxides were employed in the plating process. The adhesive strength varied depending on the surface treatment of the metal. In particular, the adhesive strength significantly increased when an undercut shape was formed at the metal surface. The best adhesive strength with GF‐filled ABS was found in the metal specimen plated using aluminum oxide particles. POLYM. ENG. SCI., 59:E93–E100, 2019. © 2018 Society of Plastics Engineers     

双水相体系萃取分离金属离子研究进展

双水相体系是一种绿色环保的新型分离技术,应用领域相当广泛,是近年来的研究热点。论述了双水相体系用于萃取分离金属离子的研究现状。根据所使用萃取剂的不同分3种情况进行了论述：不添加任何萃取剂直接萃取金属离子;以无机阴离子为萃取剂,依靠金属阳离子与无机阴离子形成的阴离子配合物（螯合物）而转移到萃取相,萃取金属离子;采用有机试剂作为萃取剂,依靠金属离子与萃取剂反应形成的中性配合物（螯合物）而转移到萃取相,萃取金属离子。论述了双水相体系萃取分离金属离子的发展趋势：建立金属离子在双水相体系中分配的机理模型;双水相体系成相物质的回收及再利用;通过无机盐水化能力的差异,或者通过双水相体系的温度诱导相分离,实现无机盐的分离与常温制备;开展双水相体系萃取分离金属离子的工程研究。     

搪瓷瓷釉与金属之间的密着

现在人们对金属的防腐越来越重视,在金属表面进行涂搪可以起到很好的防腐作用。而金属和瓷釉之间的密着对搪瓷产品的性能尤为重要。对目前国内外的搪瓷瓷釉与金属之间的密着机理进行了详细的概括和总结,指出了研究密着机理的意义并介绍了这些机理在实际中的应用。