We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Nobody downloaded yet

Processing, properties and applications of silicon carbide - Term Paper Example

Comments (0)
This term paper investigates the processing, properties and applications of silicon carbide…
Download full paper
Processing, properties and applications of silicon carbide
Read TextPreview

Extract of sample
Processing, properties and applications of silicon carbide

Download file to see previous pages... Silicon carbide, also known as carborundum, is a compound of silicon and carbon with chemical formula SiC. Historically, natural SiC was first found in meteorite in 1893 by Dr. Ferdinand Henri Moissan (Moissan 773), thus natural SiC, an extremely rare mineral, came to be known as moissanite. Although rare on earth, SiC is very common in outer space, where it is found around carbon-rich stars in the form of stardust. The natural SiC found in meteorites and that found in space are the beta-polymorph suggesting the possibility of having the same origin. This is substantiated by analysis of SiC grains found in the Murchison carbonaceous chondrite meteorite that revealed anomalous isotopic ratios of carbon and silicon, indicating an origin from outside the solar system; indeed, 99% of these SiC grains originate around carbon-rich asymptotic giant branch stars (Alexander 715).
Due to the extreme rarity of natural SiC, virtually all the SiC sold in the world market is synthetic in origin. The simplest and the commonly used approach for synthesis of SiC is the Acheson process. This approach offers the possibility of large quantity synthesis of SiC of adequate quality that it suitable for electronic application and for use in other applications. When high purity SiC is desired, methods such as the Lely process, modified Lely process, chemical vapor deposition and thermal decomposition of poly(methylsilyne) are employed. The structure and properties of SiC make it suitable for many applications. This term paper investigates the processing, properties and applications of SiC....
Processing of silicon carbide Acheson process As mentioned above, natural SiC is an extremely rare mineral. Thus synthetic methods have been developed to meet the demand for SiC. Among these method, Acheson process is the widely used (Knippenberg 161). The Acheson process involves the high temperature (1600 – 2700 °C) heating of a mixture of silica, carbon, sawdust and common salt (e.g. 50% silica, 40% coke, 7% sawdust and 3% common salt) in an Acheson graphite electric resistance furnace (Knippenberg 161). The active ingredients in the mixture are the silica, in the form of silica sand and the coke. By making the mixture porous, the sawdust facilitates the removal of carbon (II) oxide formed during the reaction process. High pressures of gas may locally be built up to form voids and channels to more porous parts of the mixture to eventually find its way out. The common salt serves as a purifier of the mixture. The chlorine will react with impurities to form volatile chlorides which escape. The heating is accomplished by means of graphite resistor placed centrally in the furnace. The mixture is place around the resistor. The purity of the SiC, which depends on the distance from the resistor, is adequate for many applications. Nitrogen and aluminum are common impurity in the SiC obtained by the Acheson process. These impurities affect the electrical conductivity of silicon carbide. Lely process High purity SiC can be obtained by the Lely process, which involves sublimating SiC powder in argon atmosphere at 2500 °C followed by re-depositing into flake-like single crystals, at a slightly colder substrate (Lely 229). This process is similar to the Acheson process in the voids and channels formed by built-up gas ...Download file to see next pagesRead More
Comments (0)
Click to create a comment
Case Study of the Credit Card Processing Industry
Credit cards are used widely today. Almost all retail stores and convenient stores in the world have accepted payments using credit cards. The credit card processing industry today has paced up in the electronics payment technology of payment .Today, a person can go anywhere in the world and purchase goods and services using a credit card.
3 Pages(750 words)Term Paper
QBA-Management Science: Report on MARKOV models' buisness applications
All events are represented as transitions from one state to another, Bradie and Michael (2000). A Markov model may be evaluated by matrix algebra, as a cohort simulation, or as a Monte Carlo simulation. The ability of the Markov model to represent repetitive events and the time dependence of both probabilities and utilities allows for more accurate representation of clinical settings that involve these issues.
6 Pages(1500 words)Term Paper
Critical Analysis Of Whether Or Not Parens Patriae Should Remain The Standard In The Processing Of Juvenile Offenders
According to the aforementioned book, it was the Illinois Juvenile Court Act 1899 that first created the Juvenile Court in America, and that expanded jurisdiction of the courts over juvenile delinquents, and dependent and neglected children.
8 Pages(2000 words)Term Paper
Research 3 software applications with balanced scorecard, business intelligence, business analytics and predictive analytics tha
Business analytic applications are generally used to measure and predict the performance of various business operations and consequently such applications are important sources of business intelligence to the organizational management which can help the to make improvements in their organization’s business functions (Davenport, 2006).This paper discuses the three main business analytics applications such as SPSS analytics, SAS analytics application and Oracle analytics software as well ass their potential deployment in cloud computing. IBM’s SPSS predictive software is currently one of the widely used business applications that enable managers to effectively and accurately predict a numbe
6 Pages(1500 words)Term Paper
The processing of applications at the VEC
Question 1 a) 1. The diagram below outlines the process map for application processing. 2. Throughput (TH) = Work In Process (WIP) x Cycle Time (CT) WIP = TH= 200 ?35 hours= 7000 WIP=200 CT= 35 3. Processing time per application WIP ?CT (200? 35 = 5.71 Hours).
5 Pages(1250 words)Assignment
The security properties of network applications
Due to the fact that these applications are now being majorly used, it is without doubt that the security of the data and information that is passed on in these channels should be adequately protected thereby ensuring the three essentials of data security.
5 Pages(1250 words)Assignment
Applications of Machiavelli
This is due to the matters of power and morality. Power and morality is what drives the modern day corporations in their performance. As I look at a corporation such as Macy’s and Apo’s inc., the application of the Machiavelli principles is so clear that it can not be ignored.
7 Pages(1750 words)Term Paper
Value enhancement of retail properties
Others synonyms of value include worth, importance, preciousness, price, cost, merit, rate etc. But for the purpose of this paper we will take value to be synonymous
7 Pages(1750 words)Term Paper
Check processing before check 21 legislation
This legislation is implemented after 9/11, when air transportation was grounded and thousands of Checks could not be cleared. Clearing was dependent after Checks were arrived at the paying banks, and timely delivery was reliant on air carrying. Before
2 Pages(500 words)Term Paper
Applications and ethics of genetic engineering and biotechnology
Secondly, these technologies possess a myriad of practices that are geared towards the improvement of human, animal and plant lives. Therefore, biotechnology can be broadly defined as the use of organisms or their products for
10 Pages(2500 words)Term Paper
Let us find you another Term Paper on topic Processing, properties and applications of silicon carbide for FREE!
Contact us:
Contact Us Now
FREE Mobile Apps:
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us