Melting conditions for quartz glass of high purity and structural perfection

Nasyrov, R. Sh.; Попов, С. А.

doi:10.1007/s10717-012-9451-z

Cited by 4 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crystallization ability of amorphous silica is determined by the purity of the starting material (presence of impurities), presence of water, gas medium during heat treatment, a number of technological factors, etc. [17].…”

Section: Materials and Methods For Studying The Effect Of Aluminum Phmentioning

confidence: 99%

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Karasik

Kozyreva

Dushyn

2021

EEJET

View full text Add to dashboard Cite

One of the significant disadvantages of quartz glass-based materials is their tendency to crystallize cristobalite during firing and, as a consequence, a significant deterioration in performance. In order to prevent crystallization of quartz ceramics during sintering, a number of additives are used. However, all known options some disadvantages, namely, relatively low strength values and increased coefficient of linear thermal expansion of products.In this regard, a promising area of research is to study the effect of aluminum phosphate additives on the properties of quartz ceramics. According to the totality of properties, the addition of AlPO4 in an amount of 20 wt % has the most positive effect on the characteristics of quartz ceramics. According to differential thermal analysis, it is noted that up to a temperature of 1,200 °C, no noticeable phase and modification transformations occur in the base mixtures. In the course of the work, it was found that the most appropriate firing mode is as follows: oxidizing medium; the products are immersed in a hot furnace, after being held at the maximum temperature, they are removed from the hot furnace, cooling occurs slowly in the air. The materials obtained in this way are characterized by the following properties: α=31.6·10-7 deg-1; σcomp=153 MPa; P=2.7 %; tgδ and ε (frequency 1010 Hz, temperature 20 °C) 0.001 and 10, respectively. It is noted that the main crystal phase prevailing in the samples is aluminum phosphate. The microstructure of the material is characterized by the presence of a small number of residual pores and a densely sintered shard.The proposed solution will significantly reduce power consumption, improve production performance and increase the basic properties of polyfunctional quartz ceramic products

show abstract

Section: Materials and Methods For Studying The Effect Of Aluminum Phmentioning

confidence: 99%

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Karasik

Kozyreva

Dushyn

2021

EEJET

View full text Add to dashboard Cite

show abstract

“…In the second stage, the obtained particle average temperature is approximately considered as the particle surface temperature and would serve as one of the temperature boundary conditions when solving the Fourier-Kirchhoff equation and the equilibrium equation for the spatiotemporal distributions of temperature and strain-stress in spherical particles [23,24]. The equivalent thermobaric stress equ In the calculation of the equivalent baric stress equ P s caused by GLI pressure in the vacuole, it is assumed that the GLI in the vacuole is in LTE, i.e.…”

Section: Physical and Mathematical Modelmentioning

confidence: 99%

Influence of vacuoles with gas–liquid inclusions on the thermobaric destruction conditions of natural quartz under dynamic heating in an RF-TICP torch system

Miao

Nie²,

Grishin³

et al. 2023

Plasma Sci. Technol.

View full text Add to dashboard Cite

In present work the turbulent mixing process of a polydisperse quartz particle flow with a plasma stream generated by an RF inductively coupled plasma torch were numerical studied. The thermobaric stress in the quartz particles under dynamic heating in a heterogeneous plasma flow was determined by a two-stage approximation approach. The effect of the presence of vacuoles in natural quartz on the particle thermobaric destruction conditions was studied. It was found that the equivalent thermal and baric stresses in quartz particles may significantly increase in the presence of vacuoles within a small gas volume fraction. The influence of the regime and energetic working conditions of an RF inductively coupled plasma torch system on the particle thermobaric destruction conditions was examined, and a recommendation was given to promote the degree of thermobaric destruction of quartz particles, which is of substantial importance for improving the overall enrichment efficiency of quartz concentrates.

show abstract

Applications of two electric arc plasma torches for the beneficiation of natural quartz

Grishin

Miao

Borisov³

et al. 2019

Int J Miner Metall Mater

View full text Add to dashboard Cite

Melting conditions for quartz glass of high purity and structural perfection

Cited by 4 publications

References 1 publication

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Determination of the influence of aluminum phosphate on the properties of quartz ceramics

Influence of vacuoles with gas–liquid inclusions on the thermobaric destruction conditions of natural quartz under dynamic heating in an RF-TICP torch system

Applications of two electric arc plasma torches for the beneficiation of natural quartz

Contact Info

Product

Resources

About