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Properties of Hollow Glass Microspheres

2023-11-03 11:52:20  Blog

What is Hollow Glass Microspheres

The composition of the glass microspheres produced by the droplet technique is limited by two fundamental conditions: 1) the starting components must form a true aqueous solution, and 2) the viscosity of the glass at refining temperatures of ~1200 to 1500°C must be low enough to give good shell sphericity/concentricity and a high-quality surface finish. A third consideration that becomes important immediately following shell formation is the glass's durability to weathering by atmospheric gases. Other advantages for which hollow microspheres are used in construction, in addition to weight and price reduction, are acoustic insulation, no need for structural reinforcements, increased rigidity, impact resistance, and resistance to high temperatures and fires. Solid glass microsphere is manufactured by direct burning of glass powders, while hollow glass microspheres are produced by adding a blowing agent to glass powder. This paper presented the production of glass microspheres by using the vertical thermal flame (VTF) process. This high density is due to the fact that water at this temperature gets more contracted than usual and will have a low volume with a higher density. This is the reason why the hollow sphere stays afloat and will only sink after the water is heated above 4 degrees Celsius. Since the moment of inertia of a hollow sphere is more than the moment of inertia of a solid sphere, we can say that acceleration is greater for a solid sphere than a hollow sphere. So, the solid sphere reaches the bottom with greater speed. The production of glass microspheres is part of an ongoing research and development program started in 1974.' and aimed at developing a method for mass-producing glass fuel containers for use in inertial confinement fusion (ICF) experiments. Several previous reports from LLNL3 " 5 have described the development of the liquid droplet technique for the production of glass microspheres. In this paper, a live review of previous data along with tie results from our more recent studies to present a detailed picture of the preparation method and properties of the glass microspheres.


Properties of Hollow Glass Microspheres

The production of the high-quality glass microspheres needed for laser fusion targets requires us to optimize a number of processing parameters. In the past, we used a largely empirical approach to determine the proper operating conditions. Although this approach was successful, it was also time-consuming and staffing-intensive. To help guide and interpret our present experimental work, we have developed a simple, one-dimensional (1-D) model to simulate the sphere formation process. The model has been used to quantify the effects of several key process variables such as the column temperature profile, purge as composition, droplet size and composition, and glass film properties. Details of this model and its application to our current glass microsphere production are discussed at length later in this paper. After a brief introduction, this paper is divided into three main sections: the first summarizes data on the composition and properties of the glass spheres, the second reviews the microsphere production method, and the third presents a discussion of the model development and application.


Historical Development of Hollow Glass Microspheres

To put the present work in proper context, it is necessary to review the development of glass-microsphere technology. In the early phases of the ICF program, the target designs called for a simple deuterium-tritium (DT) filled microsphere of low-Z material, also referred to as an exploding pusher target. Souers et al. evaluated a number of commercially available microspheres made from various materials. The first glass microspheres to be used as targets at LLNL came from two commercial sources: Emerson and Cummings (E&C) and Minnesota Mining and Manufacturing Co. (3M).1 The nominal oxide compositions of the glasses are given in Table 1. Note that the 3M product is a soda-lime silicate glass, whereas the E&C glass is primarily an alkali borosilicate. Also, the Si0 2 concentration of the E&C glass was varied to give a range of microsphere strengths; the highest silica concentration gave the strongest glass. The initial tolerances for the diameter, surface finish, and wall-thickness uniformity of the exploding pusher targets were much less stringent than those of our current high-compression designs. Consequently, it was possible to find a few suitable glass microspheres {about one out of one million) by sorting through large batches of commercially available products. This enormous screening and inspection process proved impractical as the specifications on the glass microspheres became more rigid. As a result, two new methods were developed for the specific purpose of supplying high-quality glass shells for ICF targets: 1) the liquid droplet and 2) the dried-gel processes.


Price of Hollow Glass Microspheres

Hollow Glass Microspheres particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Hollow Glass Microspheres. A large amount of large amount will be lower. The Price of Hollow Glass Microspheres is on our company's official website.


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