The modern car is a complex designer, numbering thousands of individual parts, each of which performs a strictly defined function. In the era of globalization, production chains stretch thousands of kilometers, and materials for creating a single vehicle are purchased around the globe. While previously the dominant material was steel, today engineers are actively introducing light alloys, composites and advanced polymers to reduce fuel consumption and improve safety.
Understanding that, machineIt is necessary not only for design engineers, but also for ordinary motorists planning to buy or repair. Knowledge of the properties of materials helps to assess the durability of the body, understand the principles of protection against corrosion and consciously approach the issues of disposal. In this article, we will examine the chemical and physical composition of a modern car, focusing on metals, plastics and rare elements.
On average, more than 30,000 parts are used in the production of a passenger car, which can be classified by type of raw material. The bulk of the weight, of course, are metals, but their share is gradually declining in favor of lighter and stronger composites. Up to 95% of materials used in the production of cars are recyclable.This makes the automotive industry one of the leaders in the implementation of the principles of the circular economy.
Metal skeleton: steel and aluminum
The basis of any traditional car is metal, which provides strength, torsion rigidity and passenger safety. Historically, the main material has been steelIt accounts for about 50-60% of the car’s mass. Steel is valued for its high strength, availability and predictable deformation behavior, which is critical for programmable crumple areas.
However, weight is the enemy of efficiency, so engineers are increasingly paying attention to the problem of weight loss. aluminum. This metal is three times lighter than steel, which significantly reduces the total weight of the vehicle. Aluminum alloys are actively used in the production of engine cylinder blocks, wheels, as well as body elements of premium models, such as: Audi A8 or Jaguar XE.
- 🛡️ High-strength steel: It is used in the safety frame of the cabin to protect the driver in case of impact.
- ⚖️ Aluminum: It is used to reduce the weight of the suspension and engine, improving the dynamics of acceleration.
- 🔩 Magnesium: light metal used in transmission housings and interior elements, but subject to corrosion.
It is important to note that different steel grades have different hardness and flexibility. For spars, one brand is used, capable of absorbing the energy of the impact, and for central racks - another, superhard so that the cabin does not flatten. Welding of heterogeneous metals, such as steel and aluminum, requires special technologies, such as riveting or the use of special adhesive formulations.
Why aren’t machines made entirely of titanium?
Titanium is stronger than steel and lighter than aluminum, but mining and processing are incredibly expensive. The use of titanium in mass production would make the car unaffordable for most buyers.
The Plastic Revolution: Polymers in the Automotive Industry
If you look inside a modern car, you can see that the hard metal surfaces have almost disappeared, giving way to plastics. The share of polymeric materials in the mass of the car is constantly growing and already reaches 10-15%. It is not just a cheap replacement for metal, but an engineering solution that allows you to create complex geometric shapes that are impossible or too expensive to make from metal.
In the automotive industry, special types of plastics are used that are resistant to temperature changes, ultraviolet light and mechanical stress. Polypropylene and polyamide They form the basis of bumpers, headlight housings and torpedo elements. These materials have a high impact toughness: with a light impact, they do not crack, but deform, returning to their original shape.
Special place takes ABS plastic (acrylonitrile butadienestyrene), which is distinguished by glossy shine and strength. From it make decorative linings, grilles and wheel caps. The use of plastic also helps to reduce noise and vibration, as polymers have better acoustic properties than thin metal.
⚠️ Note: When repairing plastic body elements, it is important to use special soils for plastic. A conventional paint without an adhesive layer will quickly peel off, since the surface of the polymer is too smooth and chemically inert.
- 🚗 Bumpers: They are made of thermoplastic polyurethanes that withstand shocks at low speeds.
- 🪑 Salon: The seats and upholstery often contain polyurethane foam and vinyl coatings for comfort.
- 💡 Optics: headlights are made of polycarbonate, which is more transparent than glass and does not break from stones.
When washing a car, avoid the use of aggressive solvents (acetone, gasoline) on plastic cabin elements and bumpers. They can destroy the structure of the polymer or leave undetectable matte spots.
Glass and transparent materials
The glazing of the car is not just a transparent barrier from the wind, but a complex multi-layer safety system. The windshield is made by technology triplex: two layers of glass glued together by a strong polymer film. When hit, such glass does not crumble into sharp fragments, but is covered with a network of cracks, remaining in the frame and protecting passengers from flying out of the cabin.
The side and back windows are often made from tempered-glass (Stalinite) When destroyed, it crumbles into many small granules without sharp edges, which minimizes the risk of cuts. In modern cars, glass also serves as antennas for radio and navigation, and can also have heating and tinting in mass.
In addition to the glass, the car uses transparent polymers for lighting plafons and dashboards. They are lighter than glass and allow for complex shapes. However, plastic can become cloudy over time under the influence of the sun, so manufacturers add special UV filters to the composition of the material.
| Type of glass | Location. | Impact properties |
|---|---|---|
| triplex | Frontal | Cracks, shrapnel on film |
| Stalinite | Side, back. | He's falling on the pellets. |
| Polycarbonate | Headlights, plafonds | Bends, cracks. |
Rare earth metals and electronics
Modern car is impossible to imagine without electronics, and its production is impossible without electronics. rare-earth. Unlike steel and aluminum, these elements are used in microscopic quantities, but their role is critical. Neodymium, dysprosium and samarium are essential for the creation of powerful permanent magnets that are used in electric motors of hybrids and electric cars.
Platinum, palladium and rhodium are precious metals that can be found in a catalytic converter (catalyst). They act as catalysts for chemical reactions, turning toxic exhaust gases into safe nitrogen and carbon dioxide. The cost of these metals makes old catalysts the target of theft, and their extraction is concentrated in a limited number of countries.
☑️ Checking electronics when buying
Copper and gold are widely used in wiring and connectors. Gold is not oxidized, providing reliable contact for ten years of operation. Lithium-ion batteries, which have become the standard for electric cars, contain cobalt, lithium and nickel, the extraction of which is often associated with serious environmental problems.
- ⚡ Neodymum: A key element for magnets in electric motors and acoustics speakers.
- 💰 Platinoids: indispensable in exhaust gas cleaning systems.
- 🔋 Lithium and cobalt: The basis of modern high-capacity batteries.
⚠️ Note: When disposing of the car, it is strictly forbidden to independently extract the elements of power and electronics. Batteries can contain a toxic electrolyte, and if lithium cells are damaged, ignition is possible.
Textiles, leather and composites
Comfort in the cabin is created by a combination of natural and synthetic materials. The seats of modern cars are a complex “cake” of fabrics, foam and supporting elements. Natural leather is used in the premium segment, but it requires complex treatment with chromium or plant tanides for durability.
The mass segment is dominated by eco-leather and various types of synthetic fabrics, such as alcantara. These materials are easier to clean, they are more wear-resistant and often have an anti-drink effect. The filler is polyurethane foam of different density, which forms the profile of the seat and provides cushioning.
It is worth mentioning composite materials, such as carbon (Carboniferous). It is a super-strong and lightweight material consisting of carbon filaments flooded with epoxy resin. Carbon is used in sports cars for the manufacture of body panels, roofs and interior elements. It is stronger than steel, but much lighter, though much more expensive to produce.
The combination of different materials in a car is always a compromise between cost, weight, strength and environmental friendliness.
Rubber and tyre industry
Although tires are formally consumables and are often purchased separately, they are an integral part of the machine. A modern tire is not just rubber, but a complex engineering product. Basis - rubber (natural or synthetic), which is mixed with carbon-carbon (Soot) for strength and silica to improve traction on wet roads.
Inside the tire is a frame of cord - threads of steel, polyester or rayon. It is the cord that keeps the shape of the tire under pressure and load. The side of the tires are reinforced with steel wire so that the tire sits tightly on the disk and does not jump off during maneuvers.
The composition of the rubber mixture varies depending on the purpose of the tire. Winter rubber contains more silica and special oils that do not tan in the cold. Summer is tougher to withstand high speeds and heat from friction on the asphalt. The life of rubber is limited not only by mileage, but also by time: after 5-6 years, the material begins to lose its properties even without operation.
How to determine the age of the tire?
The age of the tire can be found by the four-digit code on the sidewall enclosed in the oval. The first two digits represent the week, and the second two represent the year of production. For example, the code 3521 means that the tire is manufactured in the 35th week of 2021.
Why are the tires black?
Natural rubber has a light beige color. Black tires become due to the addition of carbon black (soot). This substance not only paints rubber, but also significantly increases its wear resistance and ability to remove heat.
Can I use different manufacturers’ tires?
It is not recommended to install tires of different models or with different tread pattern on one axle. This can lead to unstable vehicle behavior, especially on wet roads or when braking emergencyly.
Frequently Asked Questions (FAQ)
What percentage of materials in the car are recycled?
Current standards require that up to 95% of the vehicle’s mass be recycled. Metals are remelted, plastic is crushed for use as a filler, and glass goes to the production of building materials.
Why are bumpers made of plastic and not metal?
Plastic bumpers are lighter, do not rust and have shape memory (restore after light impacts). In addition, plastic is cheaper to produce complex shapes and safer for pedestrians in collisions.
Is asbestos dangerous in older cars?
In cars produced before the late 90s, asbestos could be used in brake pads and gaskets. In modern machines, it is completely banned and replaced with ceramic and organic composites.
What is a galvanic pair and why is it dangerous for cars?
Galvanic vapor occurs when two different metals (e.g. aluminum and steel) come into contact in the presence of an electrolyte (water). This causes accelerated corrosion of the less noble metal. For protection use special insulating pads and coatings.
What's a catalyst made of?
The basis of the catalyst is a ceramic or metal honeycomb coated with a layer of aluminum oxide. On this layer, microscopic particles of precious metals are deposited: platinum, palladium and rhodium, which trigger the gas purification reaction.