摘要:

Diamondlike films have unique properties that can be tailored between those of diamond and those of graphite to meet industrial applications. The purpose of this review is to emphasize the ability to prepare films with specific properties through control of the deposition parameters. The three basic approaches, plasma deposition, chemical vapor deposition, and ion beam deposition, are presented. Since the first two methods consist of complex chemical-physical systems which limit the possibilities for controlled parametric studies, the focus herein is on the latter technique. This work presents the unique capabilities of mass-selected carbon ion beam deposition in controlling deposition parameters over a wide range, particularly when combined with in-situ analysis of film evolution. The role of different deposition parameters on diamond film growth is discussed. The Houston deposition system that manifests the above features is described. A summary of results of some ongoing experiments is given to demonstrate the system capabilities for both parametric studies of diamondlike film growth and actual production of diamondlike films.

ISSN:0898-2090    

DOI:10.1080/10426918808953202

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The basic physical properties and steps in the manufacture of zirconium and important zirconium based materials are discussed. Once considered prohibitively expensive for structural use, its current cost is becoming competitive with other special alloys for various industrial applications. Its actual life cycle cost in many cases has been considerably lower than that experienced with alternative materials

ISSN:0898-2090    

DOI:10.1080/10426918808953203

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

This paper summarizes some of the pioneering work done in developing the processing techniques to consolidate metal and ceramic matrix composites with 3-D braided fiber architecture. The 3-D braided fiber architecture features a fully integrated structure with multidirectional reinforcement and allows for the braiding of complex shapes. For metal matrix composite, a 3-D braided AI2O3fibers preform reinforced Al-Li matrix composite has been successfully fabricated by liquid vacuum infiltration methods. For ceramic matrix composites, chemical vapor infiltration technique has been used to densify a 3-D braided Nicalon fibers preform with SiC matrix composite. A significant improvement in composite performance can be achieved through the architecture of 3-D integrated reinforcement geometry. The future needs and directions for developing viable methods for fabricating strong, tough high temperature composites with 3-D reinforcements is also discussed.

ISSN:0898-2090    

DOI:10.1080/10426918808953204

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

High temperature carbon-carbon composites (C-C) are increasingly used in both aerospace and commercial products. Hypersonic missiles, reusable reentry vehicles such as the space shuttle and National Aerospace Plane, aircraft brakes, and hot section jet engine components are a few examples. As costs decline with increasing volume usage, C-C will find other applications, such as biomedical products. For the present and near future, major applications will be for high temperature structures operating at temperatures above 2,000 F

ISSN:0898-2090    

DOI:10.1080/10426918808953205

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The Space Station will represent the first time that a solar dynamic power system will be used to generate electrical power in space. In a system such as this, sunlight is collected and focused by a solar concentrator onto the receiver of a heat engine, which converts the energy into electricity. The concentrator must be capable of collecting and focusing as much of the incident sunlight as possible, and it must also withstand the atomic oxygen bombardment which occurs in low-earth-orbit (LEO). This has led to the development of a system of thin film coatings applied to the concentrator facet surface in a chamber designed especially for this purpose. The system of thin film coatings employed gives both the necessary degree of reflectance and the required protection from the LEO atomic oxygen environment.

ISSN:0898-2090    

DOI:10.1080/10426918808953206

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A low energy ion implanter has been adequately modified in order to perform reactive ion beam enhanced deposition (RIBED) and dynamic recoil ion mixing experiments under controlled conditions in a high vacuum environment (better than 10-5Pa). The machine consists of a Duoplasmatron ion source, a mass analyzer, a target chamber adaptable for use with various samples, and a 2 crucible electron gun evaporator equipped with film thickness monitor

ISSN:0898-2090    

DOI:10.1080/10426918808953207

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Alumina ceramics are. widely used for LSI packages and printed circuit and sensor materials. For many of these applications, metallization of the surface is required. In general,this is performed by applying a conductive paste on the ceramic surface

ISSN:0898-2090    

DOI:10.1080/10426918808953208

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The development of high-dielectric compositions of inorganic dielectrics dispersed in an organic matrix is described. Such composites have potential value in the construction ofin situcapacitors in circuit boards. A large number of commercial barium titanates as well as a variety of commercial and experimental ceramic bodies were evaluated as loading materials. Several commercial resins were examined for use as the binder. The material having the highest dielectric constant (46.9) is a commercial barium titanate dispersed at 82.5% loading in Amoco's P-1700 Polysulfone.

ISSN:0898-2090    

DOI:10.1080/10426918808953209

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor