Assembly, comprising: a first ceramic body and a second ceramic body, wherein the first ceramic body and the second ceramic body are connected by means of a joint, said joint comprising an active brazing solder, wherein the first ceramic body and/or the second ceramic body comprise Al 2 O 3, wherein the active brazing solder comprises Zr, Ni and Ti, wherein the active brazing solder - averaged over a continuous core volume which is at a distance from the first ceramic body and from the second ceramic body of at least 1 μm, particularly at least 2 μm - has an average composition C K with a liquid temperature T I (C K), wherein particularly C K:= (c K1,..., c KN), where ICKI = 1 and wherein c Ki are the stoichiometric parts of the components Ki i = 1,..., N of the average composition of the active brazing solder in the core volume, wherein the composition C K has a thermal expansion coefficient α(C K), for which the following applies: α(C K) = m · a, where m ≤ 1.5 particularly m ≤ 1.3 and preferably m ≤ 1.2, wherein α is the average thermal expansion coefficient of the ceramic material or ceramic materials of the first and of the second ceramic body, wherein the composition C K essentially contains zirconium and titanium, with (50+x) atom % of titanium and (50-x) atom % of zirconium, wherein x < 10, particularly x < 5, wherein the composition C K is present in the phase α-(Zr, Ti), wherein the joint comprises a first limit layer and a second limit layer, which are adjacent, respectively, to the first ceramic body and the second ceramic body, characterized in that at least one of the limit layers that is located outside the core volume has an average composition C G with a liquid temperature T I (C G) which is not less than 200 K below the liquid temperature T I (C K) of the average composition C K of the core volume, wherein particularly CG:= (c G1,...,,c GN), where ICGI = 1 and where the c Gi are the stoichiometric parts of the components Ki i = 1,..., N of the average composition of the active brazing solder in the limit layer. wherein the first ceramic body and the second ceramic body are connected by means of a joint, said joint comprising an active brazing solder, wherein the first ceramic body and/or the second ceramic body comprise Al 2 O 3, wherein the active brazing solder comprises Zr, Ni and Ti, wherein the active brazing solder - averaged over a continuous core volume which is at a distance from the first ceramic body and from the second ceramic body of at least 1 μm, particularly at least 2 μm - has an average composition C K with a liquid temperature T I (C K), wherein particularly C K:= (c K1,..., c KN), where ICKI = 1 and wherein c Ki are the stoichiometric parts of the components Ki i = 1,..., N of the average composition of the active brazing solder in the core volume, wherein the composition C K has a thermal expansion coefficient α(C K), for which the following applies: α(C K) = m · a, where m ≤ 1.5 particularly m ≤ 1.3 and preferably m ≤ 1.2, wherein α is the average thermal expansion coefficient of the ceramic material or ceramic materials of the first and of the second ceramic body, wherein the composition C K essentially contains zirconium and titanium, with (50+x) atom % of titanium and (50-x) atom % of zirconium, wherein x < 10, particularly x < 5, wherein the composition C K is present in the phase α-(Zr, Ti), wherein the joint comprises a first limit layer and a second limit layer, which are adjacent, respectively, to the first ceramic body and the second ceramic body, characterized in that at least one of the limit layers that is located outside the core volume has an average composition C G with a liquid temperature T I (C G) which is not less than 200 K below the liquid temperature T I (C K) of the average composition C K of the core volume, wherein particularly CG:= (c G1,...,,c GN), where ICGI = 1 and where the c Gi are the stoichiometric parts of the components Ki i = 1,..., N of the average composition of the active brazing solder in the limit layer.