Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High-thermal-conductivity heating element and preparation method thereof
The invention provides a high-thermal-conductivity heating element and a preparation method thereof, and the high-thermal-conductivity heating element is prepared from first black silicon carbide powder, second black silicon carbide powder, flaky graphite, a polyvinyl alcohol aqueous solution and a small amount of a high-thermal-conductivity MgO sintering aid. The particle sizes of the first black silicon carbide powder and the second black silicon carbide powder are different, and the particle size ratio of the first black silicon carbide powder to the second black silicon carbide powder meets the Horsfield filling relation. Two silicon carbide powder raw materials with different particle size distribution are adopted, so that the D50 index of the silicon carbide powder raw materials meets the Horsfield filling relation, the small-particle-size silicon carbide powder can be filled in gaps formed by accumulation of large-particle-size silicon carbide powder particles, the forming density of the pressed silicon carbide heating sheet biscuit is improved, and the production efficiency is improved. And the requirement for densification of the heating sheet through later-stage high-temperature sintering shrinkage is lowered, so that the sintering temperature is lowered, and loss of crystalline flake graphite in the sintering process is avoided.
本发明提供了一种高导热发热元件及其制备方法，高导热发热元件由第一黑色碳化硅粉体、第二黑色碳化硅粉体、鳞片状石墨、聚乙烯醇水溶液以及少量高导热MgO烧结助剂制备得到，所述第一黑色碳化硅粉体和所述第二黑色碳化硅粉体的粒径不同，所述第一黑色碳化硅粉体和所述第二黑色碳化硅粉体的粒径比例满足Horsfield填充关系。本发明通过采用两种不同粒径分布的碳化硅粉体原料，使其D50指标满足Horsfield填充关系，从而使小粒径碳化硅粉体可填充于大粒径碳化硅粉体颗粒堆积形成的间隙中，从而提高了压制碳化硅发热片素坯的成型密度，降低了通过后期高温烧结收缩实现发热片致密化的要求，从而降低了烧结温度，避免了鳞片石墨在烧结过程的损失。
High-thermal-conductivity heating element and preparation method thereof
The invention provides a high-thermal-conductivity heating element and a preparation method thereof, and the high-thermal-conductivity heating element is prepared from first black silicon carbide powder, second black silicon carbide powder, flaky graphite, a polyvinyl alcohol aqueous solution and a small amount of a high-thermal-conductivity MgO sintering aid. The particle sizes of the first black silicon carbide powder and the second black silicon carbide powder are different, and the particle size ratio of the first black silicon carbide powder to the second black silicon carbide powder meets the Horsfield filling relation. Two silicon carbide powder raw materials with different particle size distribution are adopted, so that the D50 index of the silicon carbide powder raw materials meets the Horsfield filling relation, the small-particle-size silicon carbide powder can be filled in gaps formed by accumulation of large-particle-size silicon carbide powder particles, the forming density of the pressed silicon carbide heating sheet biscuit is improved, and the production efficiency is improved. And the requirement for densification of the heating sheet through later-stage high-temperature sintering shrinkage is lowered, so that the sintering temperature is lowered, and loss of crystalline flake graphite in the sintering process is avoided.
本发明提供了一种高导热发热元件及其制备方法，高导热发热元件由第一黑色碳化硅粉体、第二黑色碳化硅粉体、鳞片状石墨、聚乙烯醇水溶液以及少量高导热MgO烧结助剂制备得到，所述第一黑色碳化硅粉体和所述第二黑色碳化硅粉体的粒径不同，所述第一黑色碳化硅粉体和所述第二黑色碳化硅粉体的粒径比例满足Horsfield填充关系。本发明通过采用两种不同粒径分布的碳化硅粉体原料，使其D50指标满足Horsfield填充关系，从而使小粒径碳化硅粉体可填充于大粒径碳化硅粉体颗粒堆积形成的间隙中，从而提高了压制碳化硅发热片素坯的成型密度，降低了通过后期高温烧结收缩实现发热片致密化的要求，从而降低了烧结温度，避免了鳞片石墨在烧结过程的损失。
High-thermal-conductivity heating element and preparation method thereof
一种高导热发热元件及其制备方法
PENG WEIHUA (Autor:in) / CAO DAHU (Autor:in) / CUI LIANGLIANG (Autor:in) / ZHANG JIANBING (Autor:in)
12.04.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
/
B01F
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
,
Mischen, z.B. Lösen, Emulgieren, Dispergieren
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
G01N
Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften
,
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
/
G01R
Messen elektrischer Größen
,
MEASURING ELECTRIC VARIABLES
/
H05B
ELECTRIC HEATING
,
Elektrische Heizung
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