An introduction to kiln furniture

Kiln furniture has the function of isolating products from each other, so that a single product is not damaged by any external impact. The demand for kiln furniture has increased sharply in recent years. What is the kiln furniture used for? Why should choose kiln furniture? The following article will provide you with some information.

Here is the content list:

l Role

l Features

l Material types and their characteristics

l Must be replaced regularly

Role

Kiln furniture is used for heating processes in the production of individual parts, such as ceramic or metal parts. The kiln furniture is loaded with material to ensure that the parts neither warp nor stick together. In order to achieve high product quality and low reject rate, the charge should be heated and cooled as evenly as possible no matter where it is located in the furnace. Furnishings play an important role in the thermal management of the kiln. The interaction between furnace charge and furnace atmosphere is also strongly affected by kiln furniture. In addition to different carriers and plates, capsules of heated material are often required to control gas exchange.

Features

First, kiln furniture has good thermal shock resistance and normal temperature, high temperature mechanical performance. Second, kiln furniture has good heat conduction and air permeability. Third, kiln furniture has a higher load softening temperature and refractoriness, which requires that the load softening temperature is more than 50~100℃ higher than the firing temperature of the fired products. Fourth, kiln furniture has low weight, low heat storage, accurate size and good regularity.

Material types and their characteristics

Clay-clinker material, that is, composed of clay and clinker (saggar, waste clay, etc.) can be used at about 1300℃. High alumina, more than 46% aluminum oxide, used at less than 1450℃. Mullite, the main crystalline phase of mullite, is composed of 10% kaolin and 90% synthetic mullite, used at 1400~1500℃, and high strength. Pansy-mullite, bluestone and mullite are the main crystal phase, using the temperature of 1310℃ below. SiC and recrystallized SiC, which is characterized by excellent thermal shock resistance, high strength, the use of temperature below 1400℃. Recrystallized silicon carbide, short-term use temperature up to 1650℃. The long-term service temperature of silicon carbide combined with silicon nitride refractories formed by silicon carbide with silicon nitride as binder can be as high as 1550℃.

Must be replaced regularly

In addition to materials, kiln furniture must be heated at all times during the heat treatment process. As a result, energy consumption increases - and can even double in the case of widgets. Kiln furniture is a vulnerable part, which must be replaced regularly due to thermal-mechanical and chemical stress during use. Their production creates additional energy bills and increases the operating costs of the furnace plant. In order to improve the energy efficiency of the heat treatment process and reduce the cost, it is necessary to reduce the heat capacity of kiln furnishings and increase their service life. High bearing capacity and low quality kiln furniture materials are a special challenge in material development.

Kiln furniture is used to produce individual parts, such as ceramic or metal parts, during the heating process. Ceramic kiln furniture is responsible for handling, to ensure that the parts are not deformation, non-bonding. In order to achieve high quality and low reject rate, heating and cooling should be as uniform as possible regardless of the position of the charge in the furnace. Ceramic furnishings play an important role in controlling the temperature inside the kiln.