Low CTE cordierite bodies with narrow pore size distribution and

Details Low CTE cordierite bodies with narrow pore size distribution and Low CTE cordierite bodies with narrow pore size distribution and

1999-07-07

2000-07-11

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501118, 501119, C04B 35195

Patent

active

060872810

ABSTRACT:
Cordierite body of CTE at 25-800.degree. C. of .ltoreq.4.times.10.sup.-7 C, at least 85% of porosity having pore diameter of 0.5-5.0.mu.; or >4-6.times.10.sup.-7 C.sup.-1, porosity at least 30 vol %, at least 85% of porosity has pore diameter 0.5-5.0.mu.. Raw materials talc, Al.sub.2 O.sub.3 source, and kaolin, calcined kaolin, and/or silica, and optionally spinel, particle diameter of talc .ltoreq.3.0.mu., of Al.sub.2 O.sub.3 source <2.0.mu., kaolin is <35 wt % of raw materials when particle diameter is <2.0.mu., are blended with vehicle and aids into plastic mixture. Green body is formed, dried, fired at 1370.degree. C.-1435.degree. C. When particle diameter of talc is <2.0.mu., and Al.sub.2 O.sub.3 source is <20 wt % of raw materials, and dispersible high surface area Al.sub.2 O.sub.3 source having particle diameter of <0.3.mu., is <5.0 wt % of raw materials, and particle diameter of kaolin is <2.0.mu., heating rate from 1150.degree. C.-1275.degree. C. is >200.degree. C./hr. When particle diameter of talc is .gtoreq.2.0.mu., and Al.sub.2 O.sub.3 source is <20 wt % of raw materials, and dispersible high surface area Al.sub.2 O.sub.3 source having particle diameter of <0.3.mu., is <5.0 wt % of raw materials, and particle diameter of kaolin is <2.0.mu., heating rate from 1150.degree. C.-1275.degree. C. is >50.degree. C./hr and <600.degree. C./hr. When Al.sub.2 O.sub.3 source is less than 20 wt % of raw materials, and dispersible Al.sub.2 O.sub.3 source having particle diameter <0.3.mu.is .gtoreq.5.0 wt % of raw materials, and particle diameter of kaolin is <2.0.mu., heating rate from 1150.degree. C.-1275.degree. C. is >50.degree. C./hr. When particle diameter of kaolin is >2.0.mu., heating rate from 1150.degree. C.-1275.degree. C. is <600.degree. C./hr and >30.degree. C./hr.

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