CN1259282C - A ball mill tank with controllable temperature and vacuum degree - Google Patents

Abstract

The present invention discloses a novel controlled temperature and vacuum degree ball milling tank which belongs to the technical field of a ceramic colloid moulding process. A vacuum solenoid is arranged on the right side of a ball milling tank, and the upper part is provided with a vacuum pressure gauge. A temperature controller and a temperature gauge are arranged at the left side, and temperature control media are filled in a tank wall interlayer of the ball milling tank. The ball milling tank causes the vacuum pressure gauge and a pumping system to reach the plug-and-play goal, namely, the operation is convenient. The temperature of the temperature control media is adjusted to the required temperature, and the temperature control media can make the temperature of suspended substances in the ball milling tank consistent with that of the temperature control media. The ball milling tank can be guaranteed to control the temperature and reach the good effect of vacuum defoaming.

Description

A ball mill tank with controllable temperature and vacuum degree

technical field

The invention belongs to the technical field of ceramic colloidal molding, and in particular relates to a ball mill tank with controllable temperature and vacuum degree in the preparation process of ceramic concentrated suspension.

Background technique

The colloidal forming process is a new type of ceramic forming process developed in recent years, and has become one of the main methods of ceramic forming. The colloidal molding process uses water or non-water as the medium to disperse micron or submicron ceramic particles in it, and prepare a ceramic thick suspension with a certain solid volume fraction, which is solidified by different solidification techniques after being injected into the mold. A certain density of ceramic bodies, such as gel casting (Gelcasting), direct coagulation casting (Direct Coagulation Casting, DCC), injection molding (Injection Moulding), tape casting (Tape casting) and so on. Colloidal molding can form large-sized and complex-shaped parts, and can well control various impurities and aggregates inside the green body during the molding process, simplify the debinding process, and thus manufacture high-performance, high-reliability ceramic parts .

Generally, the density and uniformity of the ceramic structure are important indicators to measure its performance. Under the premise of strictly controlling the sintering process, the density and uniformity of the green body itself play a decisive role in the performance of the final sintered body. The higher the solid content of the suspension used in the colloidal molding process, the higher the density and uniformity of the formed body. Therefore, the key technology of colloidal molding is the preparation of ceramic concentrated suspension, which generally requires the solid phase volume fraction of the concentrated suspension to reach more than 50 vol%. But a fact that cannot be ignored is that as the solid content increases, the viscosity of the suspension will also increase, and a large amount of gas will be mixed in during the ball milling process. As the ball milling time prolongs, the gas wrapped in the suspension will be fully diffused. , dissolve in the suspension slurry in the form of molecules until the solution saturation is reached. These gas molecules will recombine under certain conditions to form bubbles. However, it is not easy to eliminate these dissolved gas molecules. Even if various defoaming procedures are adopted after ball milling, such as: adding defoaming agent, vacuum stirring, etc., the effect received is not satisfactory. Bubbles seriously affect the quality and reliability of ceramic products. In addition, in some cases, it is necessary to control the ball milling temperature of the suspension, such as direct coagulation injection molding, since the biological enzyme is added to the suspension, in order to inhibit and delay the decomposition reaction of the biological enzyme, and at the same time make it evenly mixed with the suspension , the suspension needs to be ball milled at low temperature (0-5°C). Another example is that in the hot die-casting of ceramics, ceramic powder and paraffin are mixed together. It is necessary to ensure ball milling at high temperature (such as 80°C) to mix paraffin and ceramic powder evenly, and to eliminate air bubbles. However, the current ball mill does not have the settings of vacuum defoaming and temperature control.

Contents of the invention

The invention provides a ball mill jar with controllable temperature and vacuum degree, which is characterized in that: a solenoid valve for vacuuming and a vacuum interface are installed on the right side of the ball mill jar, the main shaft is wrapped around the outer periphery of the vacuum interface; the upper part is equipped with a pressure measurement interface And a vacuum pressure gauge; a temperature controller and a temperature gauge are installed on the left; the interlayer tank wall of the ball mill tank is equipped with a temperature control medium. The inlet/outlet of the ball mill tank is installed on the opposite side of the pressure measuring interface.

The temperature control medium is oil or brine installed in the interlayer tank wall of the ball mill tank.

The beneficial effect of the present invention is that the vacuum pressure gauge and the vacuum system can be plugged and played by using the device, and the operation is convenient; the temperature control medium can be adjusted to the required temperature, and the temperature control medium can keep the temperature of the suspension in the ball mill tank with it. unanimous. It ensures that the ball mill can not only control the temperature but also achieve a good effect of vacuum defoaming.

Description of drawings

Figure 1 is a schematic diagram of the structure of a ball mill tank with controllable temperature and vacuum degree.

Detailed ways

The invention relates to a ball milling jar with controllable temperature and vacuum degree. Figure 1 shows a schematic diagram of the structure of a ball mill tank with controllable temperature and vacuum. A solenoid valve 8 and a vacuum interface 7 for vacuuming are installed on the right side of the ball mill jar, and the main shaft 6 is wrapped around the vacuum interface 7 periphery. The upper part is equipped with a pressure measuring interface and a vacuum pressure gauge 1; a temperature controller 2 and a temperature measuring gauge 3 are installed on the left side; Opposite to pressure measuring interface and vacuum pressure gauge 1. The present invention will be further described below with the ball milling process.

1. Disperse the ceramic powder in the solution containing organic matter, add the dispersant at the same time, and inject it into the ball mill tank through the inlet/outlet 5.

2. After the ball mill tank is loaded, connect the vacuum pump to vacuum through the vacuum port 7. At this time, the air bubbles in the ceramic powder in the ball mill tank are sucked out by the vacuum pump and eliminated. After the vacuum pressure gauge 1 shows the required vacuum degree 1 After -3Pa, turn off the power, and the solenoid valve 8 will be automatically closed to keep the vacuum in the ball mill tank; and the vacuum pumping system will be removed.

3. The temperature control medium 4 is adjusted to the required temperature in advance, and the temperature of the temperature control medium 4 keeps the temperature of the suspension in the ball mill tank consistent with it.

4. Turn on the ball mill for ball milling. According to needs, turn off the power supply of the ball mill at regular intervals. After the ball mill stops stably, use the vacuum pressure gauge 1 to measure the pressure in the ball mill tank. If it does not meet the requirements, start the vacuum pumping system again; The temperature of the suspension is adjusted by a temperature controller 2 . Repeat this until the end of ball milling.

Claims (1)

1. the ball grinder of controllable temperature and vacuum tightness is installed the magnetic valve that vacuumizes and is vacuumized interface on the right of ball grinder, and main shaft wraps in and vacuumizes the interface periphery; Pressure measurement interface and vacuum pressure gauge are equipped with in top; On the left is equipped with temperature regulator and temperature gauge; In the interlayer tank skin of ball grinder the temperature control medium is housed; The advancing of ball grinder/discharge port is contained in pressure measurement interface and vacuum pressure gauge opposite, it is characterized in that the temperature control medium is oil or salt solution.

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