Ceramic forming binders can help special ceramics obtain a ceramic green body with an internal uniformity and high density before sintering, and directly affect the reliability of the material and the cost of the final ceramic part.
1. Dry pressing:
Dry pressing, also known as molding, is one of the most commonly used molding methods. The granulated powder with good fluidity and suitable particle gradation is loaded into the metal mold cavity, and pressure is applied through the indenter, the indenter is displaced in the mold cavity, and the pressure is transmitted to rearrange the powder particles in the mold cavity. It is deformed and compacted to form a ceramic green body with certain strength and shape.
In the process of dry pressing, Tianshi ceramic binder mainly plays the role of bonding, increasing the particle size of false particles and increasing the strength of particles. If the addition is improper, it will be difficult to obtain a high-density green body during dry pressing.
The selection of dry molding binder should consider the following factors: thermal decomposition, crushability, strength, mold release, and powder type.
Under the premise of ensuring that the above points meet the requirements, it is better to choose a water-based binder with no ash residue, which is safer and more environmentally friendly.
Ceramic molding binder L466X plays a very important role in ceramic molding, which directly affects the rheology, formability, and product dimensional accuracy of powder.
Advantages of L-466X:
1) Effectively prevent the segregation of powder components and reduce the dust on the powder mixing site;
2) It can improve green strength and excellent bonding ability;
3) There is no residue after sintering, and there is no black spot on the surface of the workpiece;
2. Ceramic injection molding technology:
Ceramic injection molding technology is a rapid prototyping technology for precision ceramic materials. The production process of this technology consists of the following main steps: who make ptfe powder, compounding, injection, debinding and sintering. Among them, the binder and degreasing process are the core of this technology.
The binder has two basic functions in the entire ceramic injection molding technology process: it is uniformly mixed with the ceramic powder to make it have good fluidity under a certain temperature and injection pressure, and the injection molding can be successfully completed; in the degreasing stage, on the one hand It can be quickly and smoothly removed from the ceramic injection sample through a certain degreasing process, and on the other hand, the shape of the sample must be maintained.
3. Extrusion molding:
This process can extrude the ceramic powder mixture at low temperature and low pressure to obtain long wire, pipe or sheet with constant cross-section. The slurry used in ceramic extrusion is a mixture of solid powder and liquid. The basic requirements for preparing extrusion slurry are: to contain as little binder as possible to ensure minimum sintering shrinkage, to have good rheology to facilitate molding, and to ensure that the green body has the ability to maintain a certain shape after extrusion. Therefore, when choosing a binder, it is necessary to pay attention to its decomposability, water retention, wettability, and shape retention to ensure that the flexibility, strength and wettability of the ceramic body can meet the requirements.
4. Casting molding:
Tape casting mainly includes processes such as slurry preparation, ball milling and mixing, molding, drying, debinding and sintering.
As the only continuous phase in the casting tape, the binder has the greatest influence on the strength, plasticity, flexibility and smoothness of the casting tape.
Finally, the lubricating release agent for ceramic molding can effectively reduce internal and external friction, reduce the loss of pressing pressure, and increase the density of the pressing girdle. During the demoulding process, it can reduce the demoulding force, prolong the service life of the mold, and make the finished ceramic parts more durable. Good surface finish integrity.
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