The secret of green silicon carbide powder to improve the performance of composite materials
Those who have worked in composite materials know that it is more difficult to combine the advantages of different materials into a good dish than to reconcile the relationship between mother-in-law and daughter-in-law. But since the emergence of green silicon carbide powder, the “magic seasoning”, the composite material circle has directly turned on the “opening mode”. Today, let’s unveil this mysterious veil and see how this pile of green powder can make the proud masters such as carbon fiber and ceramics obedient.
1. The gifted “hexagonal warrior”
Green silicon carbide powder is born to be the “dream powder” of composite materials. The Mohs hardness is 9.5, which is only a breath worse than diamond. A brake pad factory in Guangdong has made a comparison. The composite material mixed with 20% green silicon carbide has a wear resistance index that is 3 times that of traditional materials. The workshop director Lao Huang touched the sample and muttered: “With this hardness, you can’t even leave a mark after rubbing it with sandpaper for half an hour!”
The thermal conductivity is even more outrageous. Shandong Research Institute has measured data and found that the thermal conductivity of aluminum-based composite materials containing 15% green silicon carbide soared to 220W/(m·K), which is 30% stronger than pure aluminum. Technician Xiao Liu stared at the thermal imager and exclaimed: “This heat dissipation efficiency is comparable to installing a water cooling system on the CPU!”
Chemical stability is even more unique. In a test of the lining material of a chemical pipeline in Ningbo, the green silicon carbide composite material was soaked in concentrated sulfuric acid for half a year, and the weight loss rate was less than 0.3%. Quality inspector Lao Wang held up the sample and boasted: “This corrosion resistance, even Taishang Laojun’s alchemy furnace has to pass a cigarette!”
2. The “magic moment” of the composite process
Dispersion technology is now very good. A company in Jiangsu has come up with a combination of “ultrasound + ball milling”, which disperses the micropowder more evenly than the pearls in milk tea. Master Lao Li held up the electron microscope photo and boasted: “Look at this distribution density, ants will get lost if they climb up!”
The black technology of interface combination is even more fierce. The nano-coupling agent developed by a laboratory in Shanghai has increased the bonding strength between the micropowder and the matrix to 150MPa. The project leader pushed up his glasses and said: “The last time we did the shear test, the fixture was deformed, but the composite material did not delaminate!”
3. “Highlight scene” of actual combat test
The aerospace industry has been crazy for a long time. The turbine blades of a certain aviation engine factory in Chengdu use green silicon carbide to reinforce ceramic-based composite materials, and the temperature resistance is directly up to 1600℃. Test driver Lao Zhang looked at the dashboard and drooled: “With this performance, jet engines have to call daddy!”
The battery bracket of new energy vehicles is even more exciting. The carbon fiber composite bracket of a manufacturer in Ningde has a specific strength of 8 times that of steel after being mixed with green silicon carbide. During the collision test, safety engineer Lao Li patted the car door and laughed: “Now this car body is like wearing three layers of bulletproof vests!”
The field of 5G base station heat sinks is crazy. The aluminum-based composite radiator of a manufacturer in Hangzhou has a thermal expansion coefficient controlled to 4.8×10⁻⁶/℃. The technical director pointed to the thermal cycle test data and boasted: “It can be adjusted from -50℃ to 200℃, and the size change is more serious than Virgo!”
4, “Long-termism” in the cost account
Don’t look at the high unit price of green silicon carbide micropowder, it is definitely profitable when you calculate the total account. A machinery factory in Chongqing has done an accounting: although the cost of raw materials has increased by 25%, the product life has quadrupled, and the maintenance cost saved in three years is enough to build a new workshop. The financial lady tapped the calculator and laughed: “This business is more profitable than loan sharking!”
The improvement in production efficiency is even more secretly happy. According to actual measurements of an automated production line in Tianjin, the curing time of composite materials has been shortened by 40%. The workshop director stared at the big screen and slapped his legs: “Now the production capacity is like riding a rocket, and customers are not panicking when urging orders!”
Today’s green silicon carbide micropowder is no longer a concept product in the laboratory. From spacecraft flying in the sky to new energy vehicles running on the ground, from palm-sized mobile phone chips to 100-meter-long wind turbine blades, it is everywhere. The veterans in the industry say that this thing has made a hole in the performance ceiling of composite materials. In my opinion, this is not just a simple material upgrade, but a “shot in the arm” for modern industry. If this trend continues, it is possible that one day our cutting boards will have to use this black technology – after all, who doesn’t want their kitchen utensils to be on the same level as aerospace materials?
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