This instrument is a high-temperature, transmission projection device used to measure the sintering point temperature and refractoriness of raw sand, mixtures, glass, and ceramic materials for molding materials. It allows the tester to clearly see the volume shrinkage, expansion purification, and complete spheroidization of the material sample under high temperature conditions on the mirror screen, and to know the corresponding temperatures at which various situations occur. Widely used in industries such as casting, ceramics, glass, as well as teaching and research departments.

1、 Technical parameters

1. Test temperature range: 1700 ℃.

2. Heating speed: up to 1700 ℃ in 1.5 hours, can also be adjusted as needed.

3. Image magnification: 8-9 times, and the coordinate system of the imaging image can easily quantify expansion and contraction data.

4. Maximum power consumption: 2 KW

5. Maximum size of sample: Ø 7 × 8 mm

6. According to user requirements, CCD cameras and computer image processing systems can be configured. All experimental operations are completed through a computer interface, which is easy to learn and provides a complete set of software.

2、 Composition of instruments

This instrument consists of five parts: light source, molybdenum wire furnace, projection device, electrical control box, and sample maker.

1. The device uses a 12V, 30W light source bulb to emit light and is focused by a focusing lens. The entire device is mounted on a triangular guide rail and can be moved forward and backward as needed. The focusing tube can also be adjusted up, down, left, and right.

2. The heating adopts a tube type resistance furnace, and the heating rate can be manually and program-controlled. The temperature gradient in the furnace test area is ± 15 ℃.

3. Projection section: Parallel rays from the spotlight pass through the furnace and project the sample inside the furnace onto the magnifying lens of the projection section. Reflected by a prism onto a flat mirror, and then reflected onto a milky white frosted glass screen, the experimenter can clearly see the projected images of the shrinkage, expansion, passivation, and complete spheroidization of the sample inside the furnace as the temperature changes.

4. Electrical part: It is controlled by a computer temperature controller to ensure good heating speed and control accuracy. For specific operation, please refer to its user manual.