The successful development of synthetic diamonds and the production of industrial scale are major achievements in ultra-high pressure technology and crystal production technology. It is estimated that the industrial diamonds supplied to the world market in 1984 reached 150 million carats, of which artificial diamonds reached 85%. It should be noted that low-strength diamonds used as resin binders are satisfactory, and high-quality coarse-grain diamonds for hard material sawing, drilling, and manufacturing of rollers are in short supply and have great potential. High strength, coarse particles and varieties are important features in the development of single crystal synthetic diamond and cubic boron nitride production technology in the late 1970s and early 1980s. The Scandiamant plant has four production lines, of which the largest and most important is the SDA series. In 1979, De Beer Co announced that the SDA100S can be put into production with the coarsest particles up to 20/25. In the third issue of the "Industrial Diamond" quarterly report in 1986, SDA+, SDA85+ and SDA100+ products were added to the SDA series, and the supply size was up to 18/20 mesh, which means that one millimeter of artificial single crystal diamond can be supplied to the market. . This series of products is mainly used in the processing and manufacture of various drill bits for stone and building materials. The SRD products that appeared in the early 1980s ranged in size from 100 to 400 per carat. This synthetic diamond was mainly used to make rollers. The diamonds equivalent to the SDA100 and SDA100S levels were successfully developed in 1982 and 1984 respectively, but have not been put into industrial production so far. In 1970, GECo of the United States reported on their use of the seed method to produce 5mm gem-quality diamonds in 7 days. Now it takes only a few tens of hours to grow diamonds of the same size. They can also grow diamonds up to 8mm and can produce laser windows and heat sink diamonds on a very small scale. In 1982, the Institute of Inorganic Materials of the Japan Science and Technology Agency announced the successful development of a diamond single crystal with a size of 3 mm with a period of 100 hours. It is planned to produce a large single crystal particle size of 14 mm on a 1400 ton "Belt" device. Japan’s Sumitomo Electric Co., Ltd. is a latecomer. According to Japan’s Sankei Shimbun, they have commercially produced 4~5mm gem-quality diamonds and cut diamond crystals into 2×2mm and 0.5mm thick sheets for oversize. A heat sink substrate for a scale integrated circuit. Table 1 General Electric Company and De Beers Production (Million Carats) In order to adapt to the rapid growth of industrial diamond demand, GECo invested US$90 million in Ireland to build a plant; De Beer Co plans to invest about US$170 million Expand the production of diamonds. In 1963, ASEA Sweden set up a factory to produce synthetic diamonds. In 1967, De Beer Co and AESA jointly established Scandiamant, whose production capacity has grown steadily. Now, Scandiamant has four production lines, the largest and most important is the SDA series, from SDA to SDA100S, which can produce 20-mesh mesh size products. The second production line is the production of MDA series products. The MDA series products are mostly in the size of 50 US mesh, and the fine MDA crystals can be produced within half an hour. Although GECo and De Beer Co are international leaders in many aspects of superhard material production scale, high pressure reaction chamber volume, control level, product variety, quality and particle size, De Beer Co Chairman JO Thompson is celebrating Shannon, Ireland. At the 25th anniversary of the founding of the company, “We are convinced that the De Beer Co Industrial Diamonds will continue to expand and continue to expand and thrive. But we need to focus on two aspects: first, we must Promoting new and superior industrial products produced here to the world is a challenging task; the other is to find ways to reduce costs in order to gain a foothold in the fiercely competitive world market." It is well known that after the successful synthesis of industrial diamond by static pressure method, the synthetic diamond growth process has been developed for more than 30 years, and various types of single crystal diamond have been produced. It has played a huge role in industrial production. But in the final analysis, only the high hardness characteristics of diamond are used, and the excellent characteristics of other aspects of diamond, such as high thermal conductivity, high insulation, chemical stability, high temperature semiconductor performance, etc., are the excellent electrical, optical and thermal properties of diamond. Not fully exploited. The method of low-pressure gas phase synthetic diamond developed in the 1960s and early 1970s can only grow diamond whiskers. Due to the remoteness of the application, the development is very slow. With the rapid development of thin film technology in the 1970s, diamond carbon films, diamond-like carbon films and diamond films were grown by ion beam deposition, plasma deposition, pyrolysis chemical vapor deposition and electron accelerated vapor deposition. In the mid-1970s, Vladimir Jeriakin and others at the Moscow Institute of Physical and Chemical Research made diamond films by chemical vapor deposition, which made the research of diamond film growth technology a big step forward. The manufacture of thin film diamond has opened up a broad prospect for the application of diamond, which has attracted the attention of scientists from all over the world. For example, in the early 1970s, Aisenkeig S and Chakof R of the Department of Space Science in Walsham, Masszchusatls, USA, used a diamond-like film deposited on a silicon substrate as an electrolyte to form a film capacitor with low leakage current and high dielectric of 8 to 14. Electrical constant. Since the heat generated by the semiconductor chip often causes the line to malfunction, the Soviet Union applied a diamond film to the surface of the material to form a chip with a diamond layer underneath, thereby successfully volatilizing the heat. About 20 Japanese companies made transparent ophthalmic lenses and aircraft window coatings from diamond films. Sony is testing a horn with a single component that is greatly enhanced by the diamond film. James Jonson, head of the Science and Technology Innovation Office of the US Star Wars program, pointed out that the diamond film growth technology that American scientists are currently working on is undoubtedly a revolutionary push for the semiconductor industry. He believes that the diamond film itself Can be used to make chips, and this chip is faster than GaAs chips. Jonson's office fully supports diamond film research because it is used in optical lenses and other Star Wars programs. The relevant materials can play an extremely important role. Japan estimates that the demand for industrial synthetic diamonds in Europe and the United States is 30 million carats per year, and even more. Now there are more signs. Synthetic diamonds may play an important role in the semiconductor and related electronics industries. The main place for diamonds to attract the semiconductor industry is that diamonds are more resistant to high temperatures than gallium arsenide and silicon, and have higher conductivity. They can transmit electrical pulses at a faster rate. The only unknown is their composition comparison. This problem will soon be In light, some Japanese people predict that at the beginning of the 21st century, as many as one-third of semiconductors will use diamond as the base, and the potential of the diamond market will be further expanded.
These tablecloth weights are beautiful! They are larger than the picture indicates and heavy enough to really hold my outside tablecloth on the table when it gets breezy. They make a great gift as they are not easy to find in my city.
These tablecloth weights combine function and style. Put them
on your holiday table this year and no one will even know they are more than a
fun decoration. These tablecloth weights are the picnic-perfect way to weighdown your tablecloths.
TableCloth Weight
TableCloth Weight,Heavy Duty Tablecloth Weights,Stainless Steel Tablecloth Weights,Decorative Tablecloth Weights
Eco Household Co. Ltd , http://www.eco-household.com