摘要:
The invention relates to methods of making unsupported articles of semiconducting material using thermally active molds having an external surface temperature, Tsurface, and a core temperature, Tcore, whererin Tsurface>Tcore.
摘要:
A method of making an article of a semiconducting material involves selecting a target thickness for the article and then submerging a mold into a molten semiconducting material for a submersion time effective to form a solid layer of semiconducting material over an external surface of the mold where the thickness of the solid layer is substantially equal to the target thickness. The submersion time is selected to be substantially equal to a transition time, which is determined from a plot of solid layer thickness versus submersion time for a mold having particular attributes, including mold composition, mold thickness and initial mold temperature. The transition time, and thus the submersion time, corresponds to a maximum in solid layer thickness in the solid layer thickness versus submersion time curve for the particular mold.
摘要:
Methods are disclosed for inspecting a cylindrical porous ceramic body by positioning a diffuser near, and spaced apart from, the first end of a ceramic body; flowing a tracer flow toward the diffuser, wherein a first portion of the tracer flow passes through the diffuser, and a second portion of the tracer flow does not pass through the diffuser, the first and second portions of the tracer flow then entering the first end of the ceramic body, wherein the average velocity of the first portion of the tracer flow entering the ceramic body VAVG1 is lower than the average velocity of the second portion of the tracer flow entering the ceramic body VAVG2; directing light toward the second end of the ceramic body; and detecting reflected light coming from a location proximate the second transverse face at the second end of the ceramic body.
摘要:
A method of making an article of a semiconducting material involves withdrawing from a melt of molten semiconducting material a solid mold having already formed on an external surface of the mold a solid layer of the semiconducting material. During the act of withdrawal, one or more of a temperature, a force, and a relative rate of withdrawal are controlled in order to achieve one or more desired attributes in a solid overlayer of semiconductor material that is formed over the solid layer during the withdrawal.
摘要:
Methods for making and/or treating articles of semiconducting material are disclosed. In various methods, a first article of semiconducting material is provided, the first article of semiconducting material is heated sufficiently to melt the semiconducting material, and the melted semiconducting material is solidified in a direction substantially parallel to a shortest dimension of the melted article of semiconducting material. Articles of semiconducting materials made by methods described herein are also disclosed.
摘要:
A method of making an article of a semiconducting material involves selecting a target thickness for the article and then submerging a mold into a molten semiconducting material for a submersion time effective to form a solid layer of semiconducting material over an external surface of the mold where the thickness of the solid layer is substantially equal to the target thickness. The submersion time is selected to be substantially equal to a transition time, which is determined from a plot of solid layer thickness versus submersion time for a mold having particular attributes, including mold composition, mold thickness and initial mold temperature. The transition time, and thus the submersion time, corresponds to a maximum in solid layer thickness in the solid layer thickness versus submersion time curve for the particular mold.
摘要:
The disclosure relates to substrate molds with variable thermal mass. The disclosure relates to substrate molds comprising refractory materials having a leading edge and a trailing edge, wherein the substrate mold has a graded thermal mass comprising a leading edge thermal mass (Mt(lead)) and a trailing edge thermal mass (Mt(trail)), wherein Mt(lead) is less than Mt(trail). The disclosure also relates to methods of making articles of semiconducting material and methods of minimizing total thickness variation in articles of semiconducting material, said methods comprising using the molds disclosed.
摘要:
An apparatus for mixing a vaporized precursor with a gas for producing silica particles is provided. The apparatus includes a mixer housing, a precursor delivery chamber having an output in communication with the mixer housing for delivering a vaporized precursor in the mixer housing, and an oxidizing gas delivery chamber having an output in communication with the mixer housing for delivering an oxidizing gas to be mixed with the vaporized precursor. The apparatus further includes a flashback member disposed within the mixer housing and between the output of the precursor delivery chamber and the output of the oxidizing gas delivery chamber. The flashback member is located at a minimum distance from the output of the oxidizing gas delivery chamber defined by Lminimum (cm)=0.453 U (Re)−0.5567, wherein U is the flow rate in cm/sec of precursor and Re is the flow Reynolds number. The flashback member may include a tapered surface on at least one side to reduce recirculation of vaporized gas.
摘要:
A method of making a solid layer of a semiconducting material involves selecting a mold having a leading edge thickness and a different trailing edge thickness such that in respective plots of solid layer thickness versus effective submersion time for submersion of the leading and trailing edges into molten semiconducting material, a thickness of the solid layer adjacent to the leading and trailing edges are substantially equal. The mold is submersed into and withdrawn from the molten semiconducting material to form a solid layer of semiconducting material over an external surface of the mold.
摘要:
Methods are disclosed for inspecting a cylindrical porous ceramic body by positioning a diffuser near, and spaced apart from, the first end of a ceramic body; flowing a tracer flow toward the diffuser, wherein a first portion of the tracer flow passes through the diffuser, and a second portion of the tracer flow does not pass through the diffuser, the first and second portions of the tracer flow then entering the first end of the ceramic body, wherein the average velocity of the first portion of the tracer flow entering the ceramic body VAVG1 is lower than the average velocity of the second portion of the tracer flow entering the ceramic body VAVG2; directing light toward the second end of the ceramic body; and detecting reflected light coming from a location proximate the second transverse face at the second end of the ceramic body.