sinter

Imagine tiny grains of powder, like metal or ceramic. To sinter them is to heat them until the grains stick to each other and become one solid piece. They do not fully melt. Instead, they bond little by little as the heat works on them.

You might hear about this in 3D printing, metalworking, and ceramics. It is a useful way to make strong parts from powder, especially when full melting would be harder or less practical. The word is most often used in technical settings, where people talk about heat, pressure, and fine particles coming together.

To sinter means to fuse particles together into a solid mass by heating them, but without causing them to melt completely. It's a fascinating process used in materials science, manufacturing, and even art! Think of it like building with LEGO bricks—you're joining individual pieces to create something larger, but the bricks themselves don't dissolve into one another.

The process involves applying heat (often just below the melting point) to powdered material. This causes the particles to bond at their contact points through diffusion and surface tension, resulting in a denser, stronger object. Sintering is vital for creating many everyday items: spark plugs, brake pads, filters, and even certain types of jewelry!

It's particularly important in powder metallurgy, where metal powders are compacted and sintered to create parts with specific properties. It's also used extensively in ceramics, including tiles and advanced materials like bioceramics for medical implants. Modern 3D printing often utilizes "Selective Laser Sintering" to solidify objects made from powdered metals or plastics.

So, while melting completely transforms a substance into liquid, sintering is about bonding particles together through heat, creating a solid object that's more than the sum of its parts—it's a delicate dance between temperature and material properties!