Essay On Diamond Coatings

This paper will discuss the new glassy carbon discovery. This is done by giving a brief background about the glassy carbon and its uses, as well as the diamonds that can be made of

For Centuries the only source known to man for diamonds were rivers. They were found in active rivers or in the beds of rivers long ago dried up. In 1871 diamond pipes were discovered in South Africa. They were mined from kimberlite and lamproite volcanic pipes. Magma in these pipes brought the diamond crystals to the surface from deep in the earth. These crystals were formed by temperature and high pressure. Volcanic pipes are the primary source for diamonds.

There are two ways to make diamonds in the laboratory. The first way is called high pressure, high temperature (HPHT). These diamonds are not as pure as natural diamonds though. The second way is called chemical vapor deposition. In this method it turns its back on intense pressure but creates diamonds more flawless than what nature can actually produce.

Thesis: The extremely strong chemical structure of diamonds contributes to its unique chemical and physical properties, which allow diamonds to be used for a variety of practical applications.

Rings are the most delicate and precious piece of jewelry. Their pure presence of your fingers can truly set you glowing with price as well as leave you fascinate by their sparkling shine. Rings are the proud addition of many people, so they are seeking for the right type of ring. It is important to note that the rings are made from various precious metals or materials such as gold, silver, diamond and platinum. While speaking about diamond rings, these get more and more popularity among people because of its stunning look and precious stone. If you want to buy the best and attractive ring, you can immediately visit the right and reliable online store. The best and trusted internet store comes with an exceptional range of rings for all occasions, including marriage, engagement, anniversaries and other special events. The great ring collection not only narrows down your searches, but also let you to pick the highly appropriate best diamond ring easily. The smart selection helps you to impress your partner and show your true

The De Beers Group of Companies has a leading role in the diamond exploration, diamond mining, diamond retail, diamond trading and industrial diamond manufacturing sectors. The company is currently active in every category of diamond mining: open-pit, underground, large-scale alluvial, coastal and deep sea. The company operates in 28 countries and mining takes place in Botswana, Namibia, South Africa and Canada. De Beers currently sells approximately 35% of the world’s rough diamond production through its distribution subsidiary, DTC.

In different countries, diamonds have a different connotation. In most western countries, diamonds are associated with royalty, wealth, and abundance, but in most African countries, diamonds mean bondage, greed, and terror.

The governments in the diamond industry have a lot of control what the companies can do. When mining diamonds many of land and resources are used. Governments have to take the interest of their people and also take into account what impact the diamond industry has on the local environment. In the country of Angola diamond mining has had a huge impact. Brilliantearth.com states “irresponsible diamond mining has caused soil erosion, led to deforestation, and forced local populations to relocate” (Brilliant Earth, n.d.). Governments also have to regulate labor laws for their country. In some countries diamonds are mined by small children in unsafe conditions. These responsibilities fall under the local government to protect the land from these mining companies. Local governments can write laws and regulations require diamond mining companies to take extra precautions in order to operate. This could require the diamond company to decide is it worth it to follow these regulations or find a cheaper place to mind

Until mid-1800s, diamonds were a rarity and could only be seen on the hand of a monarch. But diamond rush in the latter part of 19th century in South Africa flooded the market with diamonds, which was not ideal for De Beer’s business.

Through good times and bad, diamonds have held a special place in the minds of most Western consumers. Diamonds appeal to both their emotional and pragmatic sides,

Diamond-like carbon (DLC), exhibits a number of properties similar to diamond. DLC is a family of amorphous carbon materials, existing in seven different forms that contain sp2 and sp3 hybridised carbon atoms. Sp2 refers to the graphite bonding structure, whilst sp3 refers to a diamond bonding structure. Graphite and diamond have very similar structures, but the bonding type differentiates them. By altering the ratio of sp2 to sp3 bonding and hydrogen content, different mechanical properties in DLC films are observed. Figure 6.26 shows a phase diagram illustrating different DLC coating structures and their bonding type. More sp2 bonding gives rise to films of lower hardness and abrasion resistance, but improved tribological properties. Films containing a higher proportion of sp3 bonding and less hydrogen have a tetrahedral structure similar tantamount to diamond, exhibiting high surface toughness but reduced ductility.56 The relative proportion of the two bonding types is highly dependent on the deposition method and processing parameters.57 Values of Young’s modulus have above 900GPa have been obtained.58 Nuclear magnetic resolution (NMR) and electron energy loss spectroscopy (EELS) are common techniques to characterise the hybridization of DLC films.59

= −2.088 GPa (compressive) [43, 44]. Diamond has a face-centered cubic lattice with space group Fd3m. It has two carbon atoms in the primitive unit cell, and thus a single triply degenerate firstorder phonon with symmetry F2g [45–47]. The single sharp Raman peak at ~1332 cm−1 is assigning to these F2g modes at the center of the Brillouin zone of the cubic diamond. The importance of the ~1332 cm−1 characteristic in the Raman spectra of polycrystalline diamond films is as a valued indicator of the relative sp3 carbon content.

In a study by González et al., 2017 the influence of deep cryogenic treatment followed by a double tempering at 150°C on the erosive wear resistance of high velocity oxy-fuel (HVOF) WC-10Co-4Cr coating was evaluated. Austenitic 304 stainless steel plates (400 mm_95 mm_7 mm) were used as substrates. Agglomerated and sintered WC-10Co-4Cr Praxair spherical powder with particle size ranging between ~20 and 45 mm was used as feedstock. The coatings were fabricated by the HVOF spray process using their own deposition parameters. Cryogenically treated coatings displayed better erosive resistance at low impact angles such as 30° and both particle impact testing velocities i.e.100 m/s and 130 m/s. In contrast, at higher angles between 60° and 90°

The piezoresistivity properties of diamond allow it to be used for a variety of applications at temperatures of up to 700oC . Also diamond films can actually be used as the active sensor layer themselves in certain situations . This has been found useful for strain gauges and accelerometers as well as other areas. It is due to the piezoresistive gauge factor of diamond to be between 70-4000 and remains as such even at high temperatures. Another advantage of using diamond in these situations is that because its elastic modulus is much greater than other materials that would be used such as Silicon or silicon based compounds the diamond films can operate at much higher frequencies. Although it has been believed that only polycrystalline materials have these piezoresistive properties, in recent times the same properties have been found in amorphous films of both silicon and diamond.

diamond layers on titanium. The aim of this work was to investigate the influence of