Posted on November 2, 2020
A wide range of chemicals are used for industrial purpose. These chemicals are highly reactive in nature. Some chemicals release dangerous gases and some create aerosols when reacting with air. These chemicals are toxic to people when inhaled. Hence, safe handling of chemicals is very important. To protect the workers from chemical hazards, various health care centers have provided different safety precautions to reduce the effects of chemicals on the workers and the surrounding areas.
MOCVD is a safety method which is used to protect the staff working in chemical processing units, welding and foundry stations, as well as other areas that come into contact with these chemicals. MOCVD is a process involving chamber and flue gas chambers. The chamber is filled with corrosive gases and the flue is connected to a standard outlet in the vicinity of the chemical reaction chamber.
The chamber-and-flue system is built to provide protection to the worker in the event of an emergency by dispersing poisonous gas inside the area. The chemicals used in MOCVD are metal-organic compounds such as cadmium, lithium etc. The procedure of MOCVD is designed to provide quick responses in cases where worker exposure to harmful gases and particulates is high.
One of the most common uses of MOCVD is to manufacture stable metals using metal-organic compounds. MOCVD is also used to fabricate alloys, metals and plastics with high tensile strength. A MOCVD coating is applied to the surface of the alloy. Once the coating is applied, the alloy starts getting cooled and forming a solid layer of the metal-organic chemicals. Once cooled, the alloy stops expanding and hardening due to the effects of the chemical.
The coating provides a perfect working environment to the worker. The worker can work without worrying about the gas around him. The only thing that a worker needs to do is to make sure that he wears a respirator or other breathing apparatus when using the mocvd lab in order to avoid inhaling the toxic gas. The gases that are released during the process of MOCVD are usually volatile and can be highly dangerous. So workers are advised to stay clear of the area when the process is in progress.
The MOCVD process can be used for other processes such as epitaxial deposition and bare metal preparation. For the epitaxial deposition, the metal strip is fed into the chemical feeder at a very high rate. During this time, the compound semiconductors get excited by the high electric voltage coming from the feeders. These compounds eventually fall onto the bare metal surface and form a layer of the material. When the metal strip is removed, the metal becomes cooler and the compound semiconductor becomes a conductive one.
The other process of the MOCVD is to deposit the metal-organic chemical vapours onto the flat substrate. The coating is usually a thin layer of the chemicals. Some of the commonly used chemicals include metal oxides, boron carbide, ferricyanide and nitrogen.
The MOCVD process is also useful for the production of the h2 gas, which is otherwise a very costly product. The h2 gas is made by converting the urea compound in the urine into its solid form. Other chemicals that are used in the MOCVD process are carbon dioxide, argon, neon and helium. In the manufacturing of the h2 gas, the temperature of the gas is increased to around 1700 degrees. This makes the carbon dioxide absorbent, which makes it a very important component in some systems.
During the MOCVD processing, the substrate is placed in the MOCVD machine which has two compartments. One compartment contains a source of urea and the other the collector of the urea compound. Normally, there is also a third compartment called the absorber which contains the materials that will be transferred from the collector. The materials to be transferred are passed through the absorber into the source chamber, where they undergo crystallization. In the MOCVD machine, the quartz crystal chips are passed through the quartz tube which is sealed and protected from external influences.
When the crystals reach the destination of the absorber, they are transformed into the gas. This transformation is achieved by passing the gas through the evaporator. The quartz tube and the absorber are then positioned outside the MOCVD generator, and the gas emission starts.
The MOCVD process generates four streams of the chemical compounds gas. These are urea, carbon dioxide, nitrogen, oxygen, and carbon monoxide. These four streams have different characteristics, and depending on the types of semiconductors that are used, the composition of the gas produced is different. The four types of gases are liquid, gas, solid, and gaseous.
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